Pub Date : 2020-11-25DOI: 10.1103/physreva.102.052831
M. Togawa, S. Kühn, C. Shah, P. Amaro, R. Steinbrügge, J. Stierhof, N. Hell, M. Rosner, K. Fujii, M. Bissinger, R. Ballhausen, M. Hoesch, J. Seltmann, Sungnam Park, Filipe Grilo, F. Porter, J. Santos, M. Chung, T. Stöhlker, J. Wilms, T. Pfeifer, G. Brown, M. Leutenegger, S. Bernitt, José R. Crespo López-Urrutia
We resonantly excite the $K$ series of O$^{5+}$ and O$^{6+}$ up to principal quantum number $n=11$ with monochromatic x rays, producing $K$-shell holes, and observe their relaxation by soft-x-ray emission. Some photoabsorption resonances of O$^{5+}$ reveal strong two-electron--one-photon (TEOP) transitions. We find that for the $[(1s,2s)_1,5p_{3/2}]_{3/2;1/2}$ states, TEOP relaxation is by far stronger than the radiative decay and competes with the usually much faster Auger decay path. This enhanced TEOP decay arises from a strong correlation with the near-degenerate upper states $[(1s,2p_{3/2})_1,4s]_{3/2;1/2}$ of a Li-like satellite blend of the He-like $Kalpha$ transition. Even in three-electron systems, TEOP transitions can play a dominant role, and the present results should guide further research on the ubiquitous and abundant many-electron ions where electronic energy degeneracies are far more common and configuration mixing is stronger.
{"title":"Observation of strong two-electron–one-photon transitions in few-electron ions","authors":"M. Togawa, S. Kühn, C. Shah, P. Amaro, R. Steinbrügge, J. Stierhof, N. Hell, M. Rosner, K. Fujii, M. Bissinger, R. Ballhausen, M. Hoesch, J. Seltmann, Sungnam Park, Filipe Grilo, F. Porter, J. Santos, M. Chung, T. Stöhlker, J. Wilms, T. Pfeifer, G. Brown, M. Leutenegger, S. Bernitt, José R. Crespo López-Urrutia","doi":"10.1103/physreva.102.052831","DOIUrl":"https://doi.org/10.1103/physreva.102.052831","url":null,"abstract":"We resonantly excite the $K$ series of O$^{5+}$ and O$^{6+}$ up to principal quantum number $n=11$ with monochromatic x rays, producing $K$-shell holes, and observe their relaxation by soft-x-ray emission. Some photoabsorption resonances of O$^{5+}$ reveal strong two-electron--one-photon (TEOP) transitions. We find that for the $[(1s,2s)_1,5p_{3/2}]_{3/2;1/2}$ states, TEOP relaxation is by far stronger than the radiative decay and competes with the usually much faster Auger decay path. This enhanced TEOP decay arises from a strong correlation with the near-degenerate upper states $[(1s,2p_{3/2})_1,4s]_{3/2;1/2}$ of a Li-like satellite blend of the He-like $Kalpha$ transition. Even in three-electron systems, TEOP transitions can play a dominant role, and the present results should guide further research on the ubiquitous and abundant many-electron ions where electronic energy degeneracies are far more common and configuration mixing is stronger.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"368 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76428775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-24DOI: 10.1142/S0217979221501046
R. Lomsadze, M. Gochitashvili, R. Kezerashvili, M. Schulz
We study the electron-impact induced ionization of O$_{2}$ from threshold to 120 eV using the electron spectroscopy method. Our approach is simple in concept and embodies the ion source with a collision chamber and a mass spectrometer with a quadruple filter as a selector for the product ions. The combination of these two devices makes it possible to unequivocally collect all energetic fragment ions formed in ionization and dissociative processes and to detect them with known efficiency. The ion source allows to vary and tune the electron-impact ionization energy and the target-gas pressure. We demonstrate that for obtaining reliable results of cross sections for inelastic processes and determining mechanisms for the formation of O$^{+}$($^{4}S,^2{D},^2{P}$) ions, it is crucial to control the electron-impact energy for production of ion and the pressure in the ion source. A comparison of our results with other experimental and theoretical data shows good agreement and proves the validity of our approach.
{"title":"Electron-impact ionization and ionic fragmentation of O2 from threshold to 120 eV energy range","authors":"R. Lomsadze, M. Gochitashvili, R. Kezerashvili, M. Schulz","doi":"10.1142/S0217979221501046","DOIUrl":"https://doi.org/10.1142/S0217979221501046","url":null,"abstract":"We study the electron-impact induced ionization of O$_{2}$ from threshold to 120 eV using the electron spectroscopy method. Our approach is simple in concept and embodies the ion source with a collision chamber and a mass spectrometer with a quadruple filter as a selector for the product ions. The combination of these two devices makes it possible to unequivocally collect all energetic fragment ions formed in ionization and dissociative processes and to detect them with known efficiency. The ion source allows to vary and tune the electron-impact ionization energy and the target-gas pressure. We demonstrate that for obtaining reliable results of cross sections for inelastic processes and determining mechanisms for the formation of O$^{+}$($^{4}S,^2{D},^2{P}$) ions, it is crucial to control the electron-impact energy for production of ion and the pressure in the ion source. A comparison of our results with other experimental and theoretical data shows good agreement and proves the validity of our approach.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79185806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-23DOI: 10.1103/PHYSREVA.103.033310
Kingshuk Adhikary, Anushree Dey, Arpita Pal, S. Mal, B. Deb
We theoretically investigate the time- and frequency-domain two-particle correlations of a driven dissipative Bose-Hubbard model (BHM) at and near a dissipative phase transition (DPT). We compute Hanbury Brown-Twiss (HBT) type two-particle temporal correlation function $g^2(tau)$ which, as a function of time delay $tau$, exhibits oscillations with frequencies determined by the imaginary part of Liouvillian gap. As the gap closes near a transition point, the oscillations at that point dies down. For parameters slightly away from the transition point, the HBT correlations show oscillations from super-bunching to anti-bunching regimes. We show that the Fourier transform of HBT correlations into frequency domain provide information about DPT and Liouvillian dynamics. We numerically solve the many-body Lindblad master equation and calculate Wigner distribution of the system in steady state to ascertain DPT. Below certain drive strength, the Fourier transform shows a two-peak structure while above that strength it exhibits either a Lorenzian-like single-peak structure or a structure with two-dips. The width of the single-peak structure is minimum at the phase transition point and the peak of this structure always lies at zero frequency. The positions of the two symmetrical peaks in case of two-peak structure are given by the imaginary parts of the Liouvillian gap while their half width at half maximum (HWHM) is given by the real part of the gap. The positions and the widths of the two dips are also related to low lying eigenvalues of the Liouvillian operator. We discuss quantum statistical properties of the model in terms of the HBT correlation function and its Fourier transform.
{"title":"Time- and frequency-domain two-particle correlations of a driven dissipative Bose-Hubbard model","authors":"Kingshuk Adhikary, Anushree Dey, Arpita Pal, S. Mal, B. Deb","doi":"10.1103/PHYSREVA.103.033310","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.033310","url":null,"abstract":"We theoretically investigate the time- and frequency-domain two-particle correlations of a driven dissipative Bose-Hubbard model (BHM) at and near a dissipative phase transition (DPT). \u0000We compute Hanbury Brown-Twiss (HBT) type two-particle temporal correlation function $g^2(tau)$ which, as a function of time delay $tau$, exhibits oscillations with frequencies determined by the imaginary part of Liouvillian gap. As the gap closes near a transition point, the oscillations at that point dies down. For parameters slightly away from the transition point, the HBT correlations show oscillations from super-bunching to anti-bunching regimes. We show that the Fourier transform of HBT correlations into frequency domain provide information about DPT and Liouvillian dynamics. We numerically solve the many-body Lindblad master equation and calculate Wigner distribution of the system in steady state to ascertain DPT. \u0000Below certain drive strength, the Fourier transform shows a two-peak structure while above that strength it exhibits either a Lorenzian-like single-peak structure or a structure with two-dips. The width of the single-peak structure is minimum at the phase transition point and the peak of this structure always lies at zero frequency. The positions of the two symmetrical peaks in case of two-peak structure are given by the imaginary parts of the Liouvillian gap while their half width at half maximum (HWHM) is given by the real part of the gap. The positions and the widths of the two dips are also related to low lying eigenvalues of the Liouvillian operator. We discuss quantum statistical properties of the model in terms of the HBT correlation function and its Fourier transform.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82438136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-13DOI: 10.1103/physreva.102.063107
Kai-Niklas Schymik, Vincent Lienhard, D. Barredo, P. Scholl, H. Williams, A. Browaeys, T. Lahaye
We report on improvements extending the capabilities of the atom-by-atom assembler described in [Barredo et al., Science 354, 1021 (2016)] that we use to create fully-loaded target arrays of more than 100 single atoms in optical tweezers, starting from randomly-loaded, half-filled initial arrays. We describe four variants of the sorting algorithm that (i) allow decrease the number of moves needed for assembly and (ii) enable the assembly of arbitrary, non-regular target arrays. We finally demonstrate experimentally the performance of this enhanced assembler for a variety of target arrays.
我们报告了在[Barredo et al.， Science 354,1021(2016)]中描述的扩展原子-原子汇编器功能的改进，我们使用它在光学镊子中创建超过100个单原子的满载目标阵列，从随机加载，半填充的初始阵列开始。我们描述了排序算法的四种变体，它们(i)允许减少组装所需的移动次数，(ii)允许组装任意的、不规则的目标阵列。最后，我们通过实验证明了这种增强的汇编器对各种目标阵列的性能。
{"title":"Enhanced atom-by-atom assembly of arbitrary tweezer arrays","authors":"Kai-Niklas Schymik, Vincent Lienhard, D. Barredo, P. Scholl, H. Williams, A. Browaeys, T. Lahaye","doi":"10.1103/physreva.102.063107","DOIUrl":"https://doi.org/10.1103/physreva.102.063107","url":null,"abstract":"We report on improvements extending the capabilities of the atom-by-atom assembler described in [Barredo et al., Science 354, 1021 (2016)] that we use to create fully-loaded target arrays of more than 100 single atoms in optical tweezers, starting from randomly-loaded, half-filled initial arrays. We describe four variants of the sorting algorithm that (i) allow decrease the number of moves needed for assembly and (ii) enable the assembly of arbitrary, non-regular target arrays. We finally demonstrate experimentally the performance of this enhanced assembler for a variety of target arrays.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90270132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-09DOI: 10.1103/PHYSREVACCELBEAMS.24.024701
W. Nörtershäuser, A. Surzhykov, R. Sánchez, B. Botermann, G. Gwinner, G. Huber, S. Karpuk, T. Kühl, C. Novotny, S. Reinhardt, G. Saathoff, T. Stöhlker, A. Wolf
We report on laser spectroscopic measurements on Li$^+$ ions in the experimental storage ring ESR at the GSI Helmholtz Centre for Heavy Ion Research. Driving the $2s,^3!{S}_1;(F=frac{3}{2}) ,leftrightarrow,2p,^3!P_2;(F=frac{5}{2}) leftrightarrow 2s,^3!{S}_1;(F=frac{5}{2})$ $Lambda$-transition in $^7$Li$^+$ with two superimposed laser beams it was found that the use of circularly polarized light leads to a disappearance of the resonance structure in the fluorescence signal. This can be explained by optical pumping into a dark state of polarized ions. We present a detailed theoretical analysis of this process that supports the interpretation of optical pumping and demonstrates that the polarization induced by the laser light must then be at least partially maintained during the round trip of the ions in the storage ring. Such polarized ion beams in storage rings will provide opportunities for new experiments, especially on parity violation.
我们报道了在GSI亥姆霍兹重离子研究中心的实验存储环ESR中Li $^+$离子的激光光谱测量。用两个叠加的激光束驱动$^7$ Li $^+$中的$2s,^3!{S}_1;(F=frac{3}{2}) ,leftrightarrow,2p,^3!P_2;(F=frac{5}{2}) leftrightarrow 2s,^3!{S}_1;(F=frac{5}{2})$$Lambda$ -跃迁，发现圆偏振光的使用导致荧光信号中的共振结构消失。这可以用光泵入偏振离子的暗态来解释。我们对这一过程进行了详细的理论分析，支持光泵浦的解释，并证明了在存储环中的离子往返期间，激光引起的偏振必须至少部分保持。这种存储环中的极化离子束将为新的实验提供机会，特别是在宇称破坏方面。
{"title":"Polarization-dependent disappearance of a resonance signal: Indication for optical pumping in a storage ring?","authors":"W. Nörtershäuser, A. Surzhykov, R. Sánchez, B. Botermann, G. Gwinner, G. Huber, S. Karpuk, T. Kühl, C. Novotny, S. Reinhardt, G. Saathoff, T. Stöhlker, A. Wolf","doi":"10.1103/PHYSREVACCELBEAMS.24.024701","DOIUrl":"https://doi.org/10.1103/PHYSREVACCELBEAMS.24.024701","url":null,"abstract":"We report on laser spectroscopic measurements on Li$^+$ ions in the experimental storage ring ESR at the GSI Helmholtz Centre for Heavy Ion Research. Driving the $2s,^3!{S}_1;(F=frac{3}{2}) ,leftrightarrow,2p,^3!P_2;(F=frac{5}{2}) leftrightarrow 2s,^3!{S}_1;(F=frac{5}{2})$ $Lambda$-transition in $^7$Li$^+$ with two superimposed laser beams it was found that the use of circularly polarized light leads to a disappearance of the resonance structure in the fluorescence signal. This can be explained by optical pumping into a dark state of polarized ions. We present a detailed theoretical analysis of this process that supports the interpretation of optical pumping and demonstrates that the polarization induced by the laser light must then be at least partially maintained during the round trip of the ions in the storage ring. Such polarized ion beams in storage rings will provide opportunities for new experiments, especially on parity violation.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"146 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77618881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We model the efficiency of loading atoms of various species into a one dimensional optical lattice from a cold ensemble taking into account the initial cloud temperature and size, the lattice laser properties affecting the trapping potential, and atomic parameters. Stochastic sampling and dynamical evolution are used to simulate the transfer, leading to estimates of transfer efficiency for varying trap depth and profile. Tracing the motion of the atoms also enables the evaluation of the equilibrium temperature and site occupancy in the lattice. The simulation compares favourably against a number of experimental results, and is used to compute an optimum lattice-waist to cloud-radius ratio for a given optical power.
{"title":"Simulation of optical lattice trap loading from a cold atomic ensemble","authors":"R. S. Watson, J. McFerran","doi":"10.1364/josab.408521","DOIUrl":"https://doi.org/10.1364/josab.408521","url":null,"abstract":"We model the efficiency of loading atoms of various species into a one dimensional optical lattice from a cold ensemble taking into account the initial cloud temperature and size, the lattice laser properties affecting the trapping potential, and atomic parameters. Stochastic sampling and dynamical evolution are used to simulate the transfer, leading to estimates of transfer efficiency for varying trap depth and profile. Tracing the motion of the atoms also enables the evaluation of the equilibrium temperature and site occupancy in the lattice. The simulation compares favourably against a number of experimental results, and is used to compute an optimum lattice-waist to cloud-radius ratio for a given optical power.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77733919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Schelfhout, Lilani D. Toms-Hardman, J. McFerran
We demonstrate a means of detecting weak optical transitions in cold atoms that undergo cyclic routines with high sensitivity. The gain in sensitivity is made by probing atoms on alternate cycles leading to a regular modulation of the ground state atom population when at the resonance frequency. The atomic transition is identified by conducting a fast Fourier transform via algorithm or instrument. We find an enhancement of detection sensitivity compared to more conventional scanning methods of $sim 20$ for the same sampling time, and can detect clock lines with fewer than $10^3$ atoms in a magneto-optical trap. We apply the method to the $(6s^{2})$ $ ^{1}S_{0} - (6s6p)$ $^{3}P_{0}$ clock transition in $^{171}$Yb and $^{173}$Yb. The ac-Stark shift of this line in $^{171}$Yb is measured to be 0.19(3) kHz$cdot$W$^{-1}cdot$m$^2$ at 556 nm.
{"title":"Fourier transform detection of weak optical transitions in atoms undergoing cyclic routines","authors":"J. Schelfhout, Lilani D. Toms-Hardman, J. McFerran","doi":"10.1063/5.0034217","DOIUrl":"https://doi.org/10.1063/5.0034217","url":null,"abstract":"We demonstrate a means of detecting weak optical transitions in cold atoms that undergo cyclic routines with high sensitivity. The gain in sensitivity is made by probing atoms on alternate cycles leading to a regular modulation of the ground state atom population when at the resonance frequency. The atomic transition is identified by conducting a fast Fourier transform via algorithm or instrument. We find an enhancement of detection sensitivity compared to more conventional scanning methods of $sim 20$ for the same sampling time, and can detect clock lines with fewer than $10^3$ atoms in a magneto-optical trap. We apply the method to the $(6s^{2})$ $ ^{1}S_{0} - (6s6p)$ $^{3}P_{0}$ clock transition in $^{171}$Yb and $^{173}$Yb. The ac-Stark shift of this line in $^{171}$Yb is measured to be 0.19(3) kHz$cdot$W$^{-1}cdot$m$^2$ at 556 nm.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75297613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-21DOI: 10.1103/physreva.102.042823
Jun Jiang, Xiangyu Li, Xia Wang, C. Dong, Z. Wu
The static and dynamic electric-dipole polarizabilities and tune-out wavelengths for the ground state of Cs atoms are calculated by using a semiempirical relativistic configuration interaction plus core polarization approach. By considering the hyperfine splittings, the static and dynamic polarizabilities, hyperfine Stark shifts, and tune-out wavelengths of the hyperfine components of the ground level of $^{133}$Cs atoms are determined. It is found that the hyperfine shifts of the first primary tune-out wavelengths are about $-$0.0135 nm and 0.0106 nm, which are very close to the hyperfine interaction energies. Additionally, the contribution of the tensor polarizability to the tune-out wavelengths is determined to be about $10^{-5} sim 10^{-6}$ nm.
{"title":"Tune-out wavelengths of the hyperfine components of the ground level of \u0000Cs133\u0000 atoms","authors":"Jun Jiang, Xiangyu Li, Xia Wang, C. Dong, Z. Wu","doi":"10.1103/physreva.102.042823","DOIUrl":"https://doi.org/10.1103/physreva.102.042823","url":null,"abstract":"The static and dynamic electric-dipole polarizabilities and tune-out wavelengths for the ground state of Cs atoms are calculated by using a semiempirical relativistic configuration interaction plus core polarization approach. By considering the hyperfine splittings, the static and dynamic polarizabilities, hyperfine Stark shifts, and tune-out wavelengths of the hyperfine components of the ground level of $^{133}$Cs atoms are determined. It is found that the hyperfine shifts of the first primary tune-out wavelengths are about $-$0.0135 nm and 0.0106 nm, which are very close to the hyperfine interaction energies. Additionally, the contribution of the tensor polarizability to the tune-out wavelengths is determined to be about $10^{-5} sim 10^{-6}$ nm.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86768719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-20DOI: 10.1103/PhysRevA.103.052807
E. Endres, S. Ndengué, O. Lakhmanskaya, Seunghyun Lee, F. Gianturco, R. Dawes, R. Wester
We have studied the fundamental rotational relaxation and excitation collision of OH- J=0 1 with helium at different collision energies. Using state-selected photodetachment in a cryogenic ion trap, the collisional excitation of the first excited rotational state of OH- has been investigated and absolute inelastic collision rate coefficients have been extracted for collision temperatures between 20 and 35 K. The rates are compared with accurate quantum scattering calculations for three different potential energy surfaces. Good agreement is found within the experimental accuracy, but the experimental trend of increasing collision rates with temperature is only in part reflected in the calculations.
{"title":"Temperature-dependent rotationally inelastic collisions of \u0000OH−\u0000 and He","authors":"E. Endres, S. Ndengué, O. Lakhmanskaya, Seunghyun Lee, F. Gianturco, R. Dawes, R. Wester","doi":"10.1103/PhysRevA.103.052807","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.052807","url":null,"abstract":"We have studied the fundamental rotational relaxation and excitation collision of OH- J=0 1 with helium at different collision energies. Using state-selected photodetachment in a cryogenic ion trap, the collisional excitation of the first excited rotational state of OH- has been investigated and absolute inelastic collision rate coefficients have been extracted for collision temperatures between 20 and 35 K. The rates are compared with accurate quantum scattering calculations for three different potential energy surfaces. Good agreement is found within the experimental accuracy, but the experimental trend of increasing collision rates with temperature is only in part reflected in the calculations.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77781114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-20DOI: 10.1103/physrevresearch.2.043269
J. Lodewyck, R. Le Targat, P. Pottie, E. Benkler, S. Koke, J. Kronjäger
We present a mathematical framework adapted to the comparison of atomic clocks remotely connected by a complex network of optical or microwave links. This framework facilitates the computation of frequency ratios using a generic set of equations that are valid for a wide variety of clock architectures, making the comparison of a large number of clocks practical. This formalism suggests a generic data exchange protocol that can be used in clock comparison collaborations, for which data logging and decision taking are completely local procedures, independently implemented by the participants.
{"title":"Universal formalism for data sharing and processing in clock comparison networks","authors":"J. Lodewyck, R. Le Targat, P. Pottie, E. Benkler, S. Koke, J. Kronjäger","doi":"10.1103/physrevresearch.2.043269","DOIUrl":"https://doi.org/10.1103/physrevresearch.2.043269","url":null,"abstract":"We present a mathematical framework adapted to the comparison of atomic clocks remotely connected by a complex network of optical or microwave links. This framework facilitates the computation of frequency ratios using a generic set of equations that are valid for a wide variety of clock architectures, making the comparison of a large number of clocks practical. This formalism suggests a generic data exchange protocol that can be used in clock comparison collaborations, for which data logging and decision taking are completely local procedures, independently implemented by the participants.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76357970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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