F. Larbi, S. Bourahla, S. Kouadri Moustefai, F. Elagra
In this work, we carried out in depth the structural, electronic and optical properties of intrinsic, fluorine (F) and chlorine (Cl) doped SnO2, using a pseudo-potential plane-wave scheme in the framework of the density functional theory. We found that the substitution of oxygen by F or Cl elements slightly modified the crystalline parameters without altering the stability of SnO2 compounds. The doping of tin oxide by these two halogens is confirmed by the displacement of the Fermi level position to the conduction band. Consequently, the doped materials are strongly degenerate as illustrated by the Moss-Burstein shift: 2.310 eV and 2.332 eV for F:SnO2 and Cl:SnO2 respectively. On the other hand, the density of states and Mulliken population analysis show that the covalent character of Sn-O bond is maintained after doping, while Sn-X (X=F or Cl) formed bond reveals an ionic nature. In terms of optical properties after doping, intrinsic SnO2 exhibits low absorption while the doped ones are transparent in the visible range, making them more efficient in photovoltaic applications. Moreover, in the ultraviolet (UV) scale, pure and doped tin oxide compounds show better absorption, which may be beneficial for use in devices of protection against UV light and UV absorbers or sensors. Finally, the plasma frequencies of 28.22 eV, 29.16 eV and 27.67 eV for pure, F and Cl doped SnO2, respectively, were obtained.
{"title":"Impact of fluorine and chlorine doping on the structural, electronic and optical properties of SnO2 : First-principles study","authors":"F. Larbi, S. Bourahla, S. Kouadri Moustefai, F. Elagra","doi":"10.1139/cjp-2022-0295","DOIUrl":"https://doi.org/10.1139/cjp-2022-0295","url":null,"abstract":"In this work, we carried out in depth the structural, electronic and optical properties of intrinsic, fluorine (F) and chlorine (Cl) doped SnO2, using a pseudo-potential plane-wave scheme in the framework of the density functional theory. We found that the substitution of oxygen by F or Cl elements slightly modified the crystalline parameters without altering the stability of SnO2 compounds. The doping of tin oxide by these two halogens is confirmed by the displacement of the Fermi level position to the conduction band. Consequently, the doped materials are strongly degenerate as illustrated by the Moss-Burstein shift: 2.310 eV and 2.332 eV for F:SnO2 and Cl:SnO2 respectively. On the other hand, the density of states and Mulliken population analysis show that the covalent character of Sn-O bond is maintained after doping, while Sn-X (X=F or Cl) formed bond reveals an ionic nature. In terms of optical properties after doping, intrinsic SnO2 exhibits low absorption while the doped ones are transparent in the visible range, making them more efficient in photovoltaic applications. Moreover, in the ultraviolet (UV) scale, pure and doped tin oxide compounds show better absorption, which may be beneficial for use in devices of protection against UV light and UV absorbers or sensors. Finally, the plasma frequencies of 28.22 eV, 29.16 eV and 27.67 eV for pure, F and Cl doped SnO2, respectively, were obtained.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87103891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Panchenko, P. Beiersdorfer, N. Hell, G. Brown, R. Kelley, C. Kilbourne, F. Porter
Measurements of the L-shell x-ray emission of fluorinelike europium ions (Eu54+) were made under controlled laboratory conditions on the EBIT-I electron beam ion trap at Livermore using an x-ray calorimeter, extending such measurements to the middle of the rare earth elements. Comparing the calorimeter spectra with atomic data from the Flexible Atomic Code, we have identified and analyzed several prominent n = 3 → n = 2 transitions, including one two-electron, one-photon core changing transition and one electric quadrupole transition. We find that the measured energies are consistently up to several eV higher than predicted.
{"title":"Measurements of the L-shell x-ray emission of fluorinelike europium","authors":"D. Panchenko, P. Beiersdorfer, N. Hell, G. Brown, R. Kelley, C. Kilbourne, F. Porter","doi":"10.1139/cjp-2022-0041","DOIUrl":"https://doi.org/10.1139/cjp-2022-0041","url":null,"abstract":"Measurements of the L-shell x-ray emission of fluorinelike europium ions (Eu54+) were made under controlled laboratory conditions on the EBIT-I electron beam ion trap at Livermore using an x-ray calorimeter, extending such measurements to the middle of the rare earth elements. Comparing the calorimeter spectra with atomic data from the Flexible Atomic Code, we have identified and analyzed several prominent n = 3 → n = 2 transitions, including one two-electron, one-photon core changing transition and one electric quadrupole transition. We find that the measured energies are consistently up to several eV higher than predicted.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"84 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75886632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Dziura, Sana Tabbassum, Amanda MacNeil, D. Maharaj, R. Laxdal, O. Kester, M. Pan, H. Kumada, D. Marquardt
Each year more than 3,000 Canadians are diagnosed with brain cancers like glioblastoma multiforme or recurrent head and neck cancers which are difficult to treat with conventional radiotherapy techniques. One of the most clinically promising treatments for these cancers is boron neutron capture therapy (BNCT). This procedure involves selectively introducing a boron delivery agent into tumor cells and irradiating them with a neutron beam, which kills the cancer cells due to the high-LET radiation produced by the 10B(n,α)7Li capture reaction. The theory of BNCT has been around for a long time since 1936, but has historically been limited by poor boron delivery agents and nonoptimal neutron source facilities. Although significant improvements have been made in both of these domains, it is mainly the advancements of accelerator-based neutron sources that has led to the expansion of over 20 new BNCT facilities worldwide in the past decade. Additionally in this work, PHITS (Particle and Heavy Ion Transport Code System) simulations, in collaboration with the University of Tsukuba, were performed to examine the effectiveness of the Ibaraki-Boron Neutron Capture Therapy (iBNCT) beam shaping assembly (BSA) to moderate a neutron beam suitable for BNCT at the proposed PC-CANS (Prototype Canadian Compact Accelerator-based Neutron Source) site, which uses a similar but slightly higher energy 10 MeV proton accelerator with a 1 mA average current. The advancements of compact acceleratorbased neutron sources in recent decades has enabled significant improvements in BNCT technologies, allowing it to become a more viable clinical treatment option.
{"title":"Boron Neutron Capture Therapy in the New Age of Accelerator-Based Neutron Production and Preliminary Progress in Canada","authors":"D. Dziura, Sana Tabbassum, Amanda MacNeil, D. Maharaj, R. Laxdal, O. Kester, M. Pan, H. Kumada, D. Marquardt","doi":"10.1139/cjp-2022-0266","DOIUrl":"https://doi.org/10.1139/cjp-2022-0266","url":null,"abstract":"Each year more than 3,000 Canadians are diagnosed with brain cancers like glioblastoma multiforme or recurrent head and neck cancers which are difficult to treat with conventional radiotherapy techniques. One of the most clinically promising treatments for these cancers is boron neutron capture therapy (BNCT). This procedure involves selectively introducing a boron delivery agent into tumor cells and irradiating them with a neutron beam, which kills the cancer cells due to the high-LET radiation produced by the 10B(n,α)7Li capture reaction. The theory of BNCT has been around for a long time since 1936, but has historically been limited by poor boron delivery agents and nonoptimal neutron source facilities. Although significant improvements have been made in both of these domains, it is mainly the advancements of accelerator-based neutron sources that has led to the expansion of over 20 new BNCT facilities worldwide in the past decade. Additionally in this work, PHITS (Particle and Heavy Ion Transport Code System) simulations, in collaboration with the University of Tsukuba, were performed to examine the effectiveness of the Ibaraki-Boron Neutron Capture Therapy (iBNCT) beam shaping assembly (BSA) to moderate a neutron beam suitable for BNCT at the proposed PC-CANS (Prototype Canadian Compact Accelerator-based Neutron Source) site, which uses a similar but slightly higher energy 10 MeV proton accelerator with a 1 mA average current. The advancements of compact acceleratorbased neutron sources in recent decades has enabled significant improvements in BNCT technologies, allowing it to become a more viable clinical treatment option.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"8 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72488479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For this experiment, the nickel-boron and nickel-boron-nitrogen alloys are created using the electrochemical deposition method. Utilizing energy dispersive X-ray methods, the nickel-boron and nickel-boron-nitrogen alloys are characterized. X-ray diffraction was used to examine the crystal structure of nickel-boron and nickel-boron-nitrogen alloys. An energy dispersed X-ray fluorescence spectrometer is used to gather X-ray photons from the present samples. The number of radiated X-ray photons from the present specimens is used to compute the Kβ/Kα intensity ratios. The theoretical Coulomb and Babushkin gauges are used to calculate the populations of the 3d and 4s4p electrons. The observed data imply that shielding effects from 4s3d orbitals, hybridization, changes in energy levels, and charge transfer mechanism may be the causes of the variance in 3d and 4s4p electron populations. In an effort to clarify the conclusions drawn as a result of all these computations, this study contrasts the results with those of pure nickel.
{"title":"Application of X-rays to interpret alloying effects on the 3d and 4s4p electron populations of nickel boron nitrogen metal matrix composites","authors":"O. K. Köksal","doi":"10.1139/cjp-2022-0336","DOIUrl":"https://doi.org/10.1139/cjp-2022-0336","url":null,"abstract":"For this experiment, the nickel-boron and nickel-boron-nitrogen alloys are created using the electrochemical deposition method. Utilizing energy dispersive X-ray methods, the nickel-boron and nickel-boron-nitrogen alloys are characterized. X-ray diffraction was used to examine the crystal structure of nickel-boron and nickel-boron-nitrogen alloys. An energy dispersed X-ray fluorescence spectrometer is used to gather X-ray photons from the present samples. The number of radiated X-ray photons from the present specimens is used to compute the Kβ/Kα intensity ratios. The theoretical Coulomb and Babushkin gauges are used to calculate the populations of the 3d and 4s4p electrons. The observed data imply that shielding effects from 4s3d orbitals, hybridization, changes in energy levels, and charge transfer mechanism may be the causes of the variance in 3d and 4s4p electron populations. In an effort to clarify the conclusions drawn as a result of all these computations, this study contrasts the results with those of pure nickel.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87883331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Within the macroscopic approach, investigation of different decay modes such as alpha decay,cluster decay (12C to 40Ca), HPR, (58Ni to 85Rb) and SF half-lives are investigated in detail in the SHE, Z=119. The decay energies, penetration probability and different decay half-lives in the isotopes of SHN 290−303119 are evaluated. Both 12C and 40Ar cluster emissions reveal shorter half-lives when compared to other cluster emissions. Furthermore, 85Rb heavy particle emission from the SHN 290−303119 discloses shorter half-lives compared to other heavy particle emissions. From the comparison of different decay half-lives, it is observed that 85Rb HPR is dominant in the region 290−299119, alpha decay is dominant for the 300−302119 and SF half-lives are predominant in 303119 nuclei. Hence, the prediction of decay modes and decay path in the SHE, Z=119 are helpful in the identification of experimentally synthesized SHE.
{"title":"Radioactive decay properties of superheavy element Z= 119","authors":"N. Sowmya, A. M. Nagaraja, H. C. Manjunatha","doi":"10.1139/cjp-2022-0301","DOIUrl":"https://doi.org/10.1139/cjp-2022-0301","url":null,"abstract":"Within the macroscopic approach, investigation of different decay modes such as alpha decay,cluster decay (12C to 40Ca), HPR, (58Ni to 85Rb) and SF half-lives are investigated in detail in the SHE, Z=119. The decay energies, penetration probability and different decay half-lives in the isotopes of SHN 290−303119 are evaluated. Both 12C and 40Ar cluster emissions reveal shorter half-lives when compared to other cluster emissions. Furthermore, 85Rb heavy particle emission from the SHN 290−303119 discloses shorter half-lives compared to other heavy particle emissions. From the comparison of different decay half-lives, it is observed that 85Rb HPR is dominant in the region 290−299119, alpha decay is dominant for the 300−302119 and SF half-lives are predominant in 303119 nuclei. Hence, the prediction of decay modes and decay path in the SHE, Z=119 are helpful in the identification of experimentally synthesized SHE.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"15 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72491251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on the Green’s function approach in combination with the tight-binding approximation, we have investigated the electronic properties of zigzag bilayer phosphorene nanoribbons (ZBLPNRs). A complete and fully reversible metal to semiconductor or insulator phase transition, has been observed via tuning a perpendicular electric field. We explain the effect of the interlayer hopping parameter on the electronic characterizations, namely, the energy band-gap, Fermi velocity and effective mass of carriers in biased ZBLPNRs. In the presence of the interlayer hopping term, the band structure of a ZBLPNR in the vicinity of the Fermi level has a form of two tilted Dirac cones, while, in the absence of it, the created cones are not tilted. Besides, the bands above and below the Fermi level are not symmetric,{it i.e.}, there is no electron-hole symmetry for both limits of the interlayer coupling. A remarkable tuning of both the Fermi velocity and the reciprocal effective mass can be observed by adjusting the external bias voltage. At certain critical bias voltages, the band edge reciprocal masses and carrier velocities become zero, {it i.e.}, the electrons exhibit a localization behaviour. This phenomenon indeed is a transition from massive to massless Dirac fermions and vice versa. The possibility of simultaneous control of the thermal and magnetic properties using an electric agent, which can be realized experimentally by using an perpendicular potential difference, open up possibilities for low power consumed thermomagnetic devices based on ZBLPNRs.
{"title":"Fermi velocity and effective mass of quasiparticles in bilayer phosphorene nanoribbons","authors":"Morad Ali Peyvand, Bahman Ravaee, M. Zare","doi":"10.1139/cjp-2022-0037","DOIUrl":"https://doi.org/10.1139/cjp-2022-0037","url":null,"abstract":"Based on the Green’s function approach in combination with the tight-binding approximation, we have investigated the electronic properties of zigzag bilayer phosphorene nanoribbons (ZBLPNRs). A complete and fully reversible metal to semiconductor or insulator phase transition, has been observed via tuning a perpendicular electric field. We explain the effect of the interlayer hopping parameter on the electronic characterizations, namely, the energy band-gap, Fermi velocity and effective mass of carriers in biased ZBLPNRs. In the presence of the interlayer hopping term, the band structure of a ZBLPNR in the vicinity of the Fermi level has a form of two tilted Dirac cones, while, in the absence of it, the created cones are not tilted. Besides, the bands above and below the Fermi level are not symmetric,{it i.e.}, there is no electron-hole symmetry for both limits of the interlayer coupling. A remarkable tuning of both the Fermi velocity and the reciprocal effective mass can be observed by adjusting the external bias voltage. At certain critical bias voltages, the band edge reciprocal masses and carrier velocities become zero, {it i.e.}, the electrons exhibit a localization behaviour. This phenomenon indeed is a transition from massive to massless Dirac fermions and vice versa. The possibility of simultaneous control of the thermal and magnetic properties using an electric agent, which can be realized experimentally by using an perpendicular potential difference, open up possibilities for low power consumed thermomagnetic devices based on ZBLPNRs.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"93 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83861943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The energy eigenvalues En in finite square quantum wells (SQW) cannot be found using an analytic expression. As a result, numerical methods are normally used to find the eigenvalues from a transcendental equation. In this report, it will be shown that the eigenvalue solution for a given state consists in finding the only real positive root of a depressed trinomial polynomial of third order, which is as easy to solve as a quadratic equation. The method proposed can also be applied for semi-infinite, finite and asymmetric SQW, which are often presented in Quantum Mechanics (QM) textbooks at the undergraduate level. The proposed method can be applied during an exam when programmable calculators are not allowed as the real root of the trinomial polynomial can be found using the formula for the cubic equation found nearly 500 years ago.
{"title":"Approximate solutions of the transcendental equation for the square quantum wells by finding the real root of the cubic equation.","authors":"J. Noël, L. Levesque","doi":"10.1139/cjp-2023-0004","DOIUrl":"https://doi.org/10.1139/cjp-2023-0004","url":null,"abstract":"The energy eigenvalues En in finite square quantum wells (SQW) cannot be found using an analytic expression. As a result, numerical methods are normally used to find the eigenvalues from a transcendental equation. In this report, it will be shown that the eigenvalue solution for a given state consists in finding the only real positive root of a depressed trinomial polynomial of third order, which is as easy to solve as a quadratic equation. The method proposed can also be applied for semi-infinite, finite and asymmetric SQW, which are often presented in Quantum Mechanics (QM) textbooks at the undergraduate level. The proposed method can be applied during an exam when programmable calculators are not allowed as the real root of the trinomial polynomial can be found using the formula for the cubic equation found nearly 500 years ago.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"18 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84481700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we have studied the bulk viscous fluid connected with string cosmological model in a higher dimensional (five dimensions) Bianchi type-III space–time in the framework of Lyra’s manifold. To get the deterministic solution of the field equations, we assume two physically appropriate conditions: ( i) θ in the model parameter that is proportional to the eigen value of [Formula: see text] of the shear tensor [Formula: see text] and ( ii) the periodic time-varying deceleration parameter q specified as q = mcos ( kt) − 1, where m, k > 0. In this paper, we have studied the periodic time-varying behaviour of a few quantities, such as the deceleration parameter q, the energy density ρ, the proper pressure p, the string tension density λ, the total pressure [Formula: see text], the energy density for particle ρp, and the displacement vector β( t), and we have discussed the physical significance of these quantities. It has been found that in the early stages of the universe’s evolution, string prevails over particles, whereas the universe is dominated by massive string at late time. It is also noted that the string phase of the cosmos does not vanish in the model since particle density is constantly positive throughout the universe’s history. In normal gauge treatment, β( t) acts like cosmological constant (Λ), and the solutions are compatible with observations. For the stability analysis, we have investigated the nature of various energy conditions (ECs). The positive behaviour of DEC indicates the model’s validation; on the other hand, SEC and WEC are violating, indicating the universe’s accelerated expansion.
本文在Lyra流形的框架下，研究了高维(五维)Bianchi - iii型时空中体积黏性流体与弦宇宙学模型的连接。为了得到场方程的确定性解，我们假设了两个物理上适当的条件:(i)模型参数中的θ与剪切张量[公式:见文][公式:见文]的特征值成正比;(ii)周期性时变减速参数q指定为q = mcos (kt)−1，其中m, k > 0。本文研究了减速参数q、能量密度ρ、固有压力p、弦张力密度λ、总压力[公式:见文]、粒子能量密度ρp、位移矢量β(t)等物理量的周期性时变行为，并讨论了这些物理量的物理意义。人们已经发现，在宇宙演化的早期阶段，弦压倒了粒子，而宇宙在后期则由大质量弦主导。我们还注意到，宇宙的弦相在模型中不会消失，因为粒子密度在整个宇宙历史中一直是正的。在标准规范处理中，β(t)的作用类似于宇宙常数(Λ)，其解与观测结果相一致。对于稳定性分析，我们研究了各种能量条件(ECs)的性质。DEC的正向行为表明模型的有效性;另一方面，SEC和WEC是违反的，这表明宇宙正在加速膨胀。
{"title":"String cosmological scenario in periodic time-varying deceleration parameter in Lyra geometry","authors":"V. Gore, A. Dixit, D. Chouhan","doi":"10.1139/cjp-2022-0203","DOIUrl":"https://doi.org/10.1139/cjp-2022-0203","url":null,"abstract":"In this paper, we have studied the bulk viscous fluid connected with string cosmological model in a higher dimensional (five dimensions) Bianchi type-III space–time in the framework of Lyra’s manifold. To get the deterministic solution of the field equations, we assume two physically appropriate conditions: ( i) θ in the model parameter that is proportional to the eigen value of [Formula: see text] of the shear tensor [Formula: see text] and ( ii) the periodic time-varying deceleration parameter q specified as q = mcos ( kt) − 1, where m, k > 0. In this paper, we have studied the periodic time-varying behaviour of a few quantities, such as the deceleration parameter q, the energy density ρ, the proper pressure p, the string tension density λ, the total pressure [Formula: see text], the energy density for particle ρp, and the displacement vector β( t), and we have discussed the physical significance of these quantities. It has been found that in the early stages of the universe’s evolution, string prevails over particles, whereas the universe is dominated by massive string at late time. It is also noted that the string phase of the cosmos does not vanish in the model since particle density is constantly positive throughout the universe’s history. In normal gauge treatment, β( t) acts like cosmological constant (Λ), and the solutions are compatible with observations. For the stability analysis, we have investigated the nature of various energy conditions (ECs). The positive behaviour of DEC indicates the model’s validation; on the other hand, SEC and WEC are violating, indicating the universe’s accelerated expansion.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"9 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90336393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The spectroscopic and molecular properties of the title molecules have been investigated by means of the diffusion Monte Carlo (DMC) method, to provide theoretical information for molecular species that are scarce in literature. To this aim, potential energy curves have been constructed for the selected dimers in neutral and anionic forms within DMC employing single determinant trial wave functions of orbitals obtained from density functional theory calculations. Bond length, transition energy, vibrational frequency, and electron affinity have been determined for each species. Results have been discussed and compared with their isovalents where available.
{"title":"Diffusion Monte Carlo calculations on the low-lying states of LaX (X = Ge, As, Te)","authors":"Nagat Elkahwagy, A. Ismail","doi":"10.1139/cjp-2022-0152","DOIUrl":"https://doi.org/10.1139/cjp-2022-0152","url":null,"abstract":"The spectroscopic and molecular properties of the title molecules have been investigated by means of the diffusion Monte Carlo (DMC) method, to provide theoretical information for molecular species that are scarce in literature. To this aim, potential energy curves have been constructed for the selected dimers in neutral and anionic forms within DMC employing single determinant trial wave functions of orbitals obtained from density functional theory calculations. Bond length, transition energy, vibrational frequency, and electron affinity have been determined for each species. Results have been discussed and compared with their isovalents where available.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"39 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80924741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The minimal length Generalized Uncertainty Principle (GUP) is a proposed theory based on the basic phenomenology of Quantum Gravity (QG) to study the effect of gravity in the quantum realm in a non-relativistic way. In this paper, we study the GUP effect on Anharmonic oscillator by the ladder operator and perturbation theory. Taking different order of perturbation from the potential of Anharmonic oscillator, the first and second order energy corrections and the first order correction of wavefunction have been derived. We have also studied the variation of energy spectrum in general Harmonic and Anharmonic oscillator in an undergraduate non-relativistic approach.
{"title":"EFFECT OF GENERALIZED UNCERTAINTY PRINCIPLE ON ANHARMONIC OSCILLATOR","authors":"Aniket Nag, S. Sahoo","doi":"10.1139/cjp-2022-0303","DOIUrl":"https://doi.org/10.1139/cjp-2022-0303","url":null,"abstract":"The minimal length Generalized Uncertainty Principle (GUP) is a proposed theory based on the basic phenomenology of Quantum Gravity (QG) to study the effect of gravity in the quantum realm in a non-relativistic way. In this paper, we study the GUP effect on Anharmonic oscillator by the ladder operator and perturbation theory. Taking different order of perturbation from the potential of Anharmonic oscillator, the first and second order energy corrections and the first order correction of wavefunction have been derived. We have also studied the variation of energy spectrum in general Harmonic and Anharmonic oscillator in an undergraduate non-relativistic approach.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"24 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82754949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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