Journal of Electron Spectroscopy and Related Phenomena最新文献

{"title":"Attosecond dynamics of electron scattering by an absorbing layer","authors":"R.O. Kuzian ,&nbsp;E.E. Krasovskii","doi":"10.1016/j.elspec.2025.147535","DOIUrl":"10.1016/j.elspec.2025.147535","url":null,"abstract":"<div><div>Attosecond dynamics of electron reflection from a thin film is studied based on a one-dimensional jellium model. Following the Eisenbud–Wigner–Smith concept, the reflection time delay <span><math><mrow><mi>Δ</mi><msub><mrow><mi>τ</mi></mrow><mrow><mtext>r</mtext></mrow></msub></mrow></math></span> is calculated as the energy derivative of the phase of the complex reflection amplitude <span><math><mi>r</mi></math></span>. For a purely elastic scattering by a jellium slab of a finite thickness <span><math><mi>d</mi></math></span> the transmission probability <span><math><mi>T</mi></math></span> oscillates with the momentum <span><math><mi>K</mi></math></span> in the solid with a period <span><math><mrow><mi>π</mi><mo>/</mo><mi>d</mi></mrow></math></span>, and <span><math><mrow><mi>Δ</mi><msub><mrow><mi>τ</mi></mrow><mrow><mtext>r</mtext></mrow></msub></mrow></math></span> closely follows these oscillations. The reflection delay averaged over an energy interval grows with <span><math><mi>d</mi></math></span>, but in the limit of <span><math><mrow><mi>d</mi><mo>→</mo><mi>∞</mi></mrow></math></span> the amplitude <span><math><mi>r</mi></math></span> becomes real, so <span><math><mrow><mi>Δ</mi><msub><mrow><mi>τ</mi></mrow><mrow><mtext>r</mtext></mrow></msub></mrow></math></span> vanishes. This picture changes substantially with the inclusion of an absorbing potential <span><math><mrow><mo>−</mo><mi>i</mi><msub><mrow><mi>V</mi></mrow><mrow><mi>i</mi></mrow></msub></mrow></math></span>: As expected, for a sufficiently thick slab the reflection amplitude now tends to its asymptotic value for a semi-infinite crystal. Interestingly, for <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>i</mi></mrow></msub><mo>≠</mo><mn>0</mn></mrow></math></span>, around the <span><math><mrow><mi>T</mi><mrow><mo>(</mo><mi>E</mi><mo>)</mo></mrow></mrow></math></span> maxima, the <span><math><mrow><mi>Δ</mi><msub><mrow><mi>τ</mi></mrow><mrow><mtext>r</mtext></mrow></msub><mrow><mo>(</mo><mi>E</mi><mo>)</mo></mrow></mrow></math></span> curve strongly deviates from <span><math><mrow><mi>T</mi><mrow><mo>(</mo><mi>E</mi><mo>)</mo></mrow></mrow></math></span>, showing a narrow dip just at the <span><math><mrow><mi>Δ</mi><msub><mrow><mi>τ</mi></mrow><mrow><mtext>r</mtext></mrow></msub><mrow><mo>(</mo><mi>E</mi><mo>)</mo></mrow></mrow></math></span> maximum for <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>i</mi></mrow></msub><mo>=</mo><mn>0</mn></mrow></math></span>. An analytical theory of this counterintuitive behavior is developed.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"280 ","pages":"Article 147535"},"PeriodicalIF":1.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610416","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}

{"title":"Photoelectron diffraction of twisted bilayer graphene","authors":"S. Tricot ,&nbsp;H. Ikeda ,&nbsp;H.C. Tchouekem ,&nbsp;J.-C. Le Breton ,&nbsp;S. Yasuda ,&nbsp;P. Krüger ,&nbsp;P. Le Fèvre ,&nbsp;D. Sébilleau ,&nbsp;T. Jaouen ,&nbsp;P. Schieffer","doi":"10.1016/j.elspec.2025.147524","DOIUrl":"10.1016/j.elspec.2025.147524","url":null,"abstract":"<div><div>Photoelectron diffraction (PED) is a powerful spectroscopic technique that combines elemental resolution with a high sensitivity to the local atomic arrangement at crystal surfaces, thus providing unique fingerprints of selected atomic sites in matter. Stimulated by the rapid innovation in the development of various analysis methods for probing the atomic and electronic structures of van der Waals (vdW) heterostructures of two-dimensional materials, we present a theoretical assessment of the capacity of PED for extracting structural properties such as stacking, twist angles and interlayer distances. We provide a complete description of PED for the benchmark vdW heterostructure bilayer graphene (BLG), by calculating and analyzing the PED of BLG in Bernal and AA-stacking as well as twisted BLG for a wide range of the twist angle.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"280 ","pages":"Article 147524"},"PeriodicalIF":1.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551406","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}

{"title":"Experimental study on low-pressure and high-temperature pyrolysis of 1, 3-butadiene using synchrotron radiation and SiC flash microreactor","authors":"Jun Zhang ,&nbsp;Jianhui Jin ,&nbsp;Yujie Zhao ,&nbsp;Jize Sun ,&nbsp;Weifeng Wang","doi":"10.1016/j.elspec.2025.147527","DOIUrl":"10.1016/j.elspec.2025.147527","url":null,"abstract":"<div><div>1,3-Butadiene is a crucial intermediate in hydrocarbon combustion and pyrolysis processes and plays a significant role as a precursor in the formation of polycyclic aromatic hydrocarbons (PAHs) and soot. This study investigates the low-pressure and high-temperature pyrolysis of 1,3-butadiene by using a newly designed silicon carbide (SiC) tubular flow microreactor, in combination with supersonic molecular beam sampling, synchrotron radiation vacuum ultraviolet single-photon ionization, and reflective time-of-flight mass spectrometry (SR-VUV-TOF-PIMS). We identified 36 pyrolysis products, ranging in mass-to-charge ratio (<em>m/z</em>) from 15 to 128, which included free radicals and isomeric species. The study determined the initial pyrolysis temperature of the parent compound and the initial formation temperatures of the products. Comparative analysis of our results with previous literature revealed the primary cleavage pathways in this work: 1,3-C₄H₆ → C₂H₄ + C₂H₂, 1,3-C₄H₆ → 1,2-C₄H₆, 1,2-C₄H₆ → C₃H₃· + CH₃·_, 1,3-C₄H₆ + C₃H₃· → C₃H₄ + C₄H₅·, 1,3-i-C₄H₅· → C₄H₄ + H· and 1,3-n-C₄H₅· → C₄H₄ + H·. These studies contribute valuable insights into the mechanisms of hydrocarbon combustion and pyrolysis, as well as the reference for the formation processes of PAHs and soot.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"280 ","pages":"Article 147527"},"PeriodicalIF":1.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551405","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}

{"title":"Phonon effects in high-energy photoemission spectra","authors":"Takashi Fujikawa,&nbsp;Kaori Niki","doi":"10.1016/j.elspec.2025.147525","DOIUrl":"10.1016/j.elspec.2025.147525","url":null,"abstract":"<div><div>In this paper some phonon effects on high-energy photoemission spectra for solids are discussed from a theoretical point of view. In case of photoemission from deep cores, recoil and Franck–Condon (FC) effects play some important roles: The former contributes to the peak shift following classical free atom recoil shift rule, however the latter has no influence on the shift within the harmonic phonon approximation. Both contribute to the temperature dependent peak broadening. In addition to these individual effects, the interference between recoil and FC should be considered, which contributes to the peak shift. In the harmonic approximation, the recoil shift is independent of the temperature. Beyond this approximation, we can expect that the recoil shift depends on the temperature in accordance with the observed results for some special systems. In addition to the core level photoemission, we discuss the high-energy photoemission from extended valence levels: Recoil effects and the turnover from ARPES to XPS limit are discussed.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"280 ","pages":"Article 147525"},"PeriodicalIF":1.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509353","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}

{"title":"The effect of edge configurations diversity on the energy gap in MXene zigzag nanoribbons based on Ti3C2O2 and Sc3C2F2","authors":"M.S. Akhoundi Khezrabad ,&nbsp;O. Soltani ,&nbsp;A. Shokri","doi":"10.1016/j.elspec.2025.147526","DOIUrl":"10.1016/j.elspec.2025.147526","url":null,"abstract":"<div><div>In this study, we report the band structure and energy gap of different edges of Ti₃C₂O₂ and Sc₃C₂F₂ zigzag nanoribbons using tight-binding approximation. Our results show that in most widths of zigzag nanoribbons, the energy gap in different edge configurations has different values even though they have the same width. In Ti₃C₂O₂ nanoribbons, the presence of central atoms at the edge of the zigzag nanoribbon increases the band-gap and in Sc₃C₂F₂ nanoribbon, depending on the width of the nanoribbon, the presence of central atoms or surface atoms on the edge of the nanoribbon can increase the band-gap. The maximum difference reaches 0.3 eV in Sc₃C₂F₂ nanoribbon and 0.17 eV in Ti₃C₂O₂ nanoribbon. The band gap depending on the edge atoms can be important for the design and use of MXene nanoribbons in electronic and optoelectronic devices.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"279 ","pages":"Article 147526"},"PeriodicalIF":1.8,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487746","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}

{"title":"Photoionization and electronic structure of chemical warfare agents","authors":"Igor Novak","doi":"10.1016/j.elspec.2025.147523","DOIUrl":"10.1016/j.elspec.2025.147523","url":null,"abstract":"<div><div>The vertical, valence ionization energies for several chemical warfare agents (CWA): nerve agents, choking agents and blister agents have been calculated (as free molecules) using high-level ab initio coupled-cluster method: IP-EOM-CCSD. The calculated vertical, valence ionization energies were used to simulate UV photoelectron spectra. We also calculated 1st adiabatic ionization energies for these CWA. Our results, especially 1st ionization energies (vertical and adiabatic) may be useful when applying photoionization techniques as part of hyphenated methods for detection and identification of CWA. The variations of vertical ionization energies were rationalized by the analysis of the electronic structure of CWA. The influence of electronic structures on toxicological properties is also discussed on the basis of calculated Hirshfeld type charges.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"279 ","pages":"Article 147523"},"PeriodicalIF":1.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anisotropic dispersion of excitonic bands of the single-crystal pentacene (001) surface as measured by low-energy angle-resolved high-resolution electron energy-loss spectroscopy","authors":"Yasuo Nakayama ,&nbsp;François C. Bocquet ,&nbsp;Ryohei Tsuruta ,&nbsp;Serguei Soubatch ,&nbsp;F. Stefan Tautz","doi":"10.1016/j.elspec.2025.147514","DOIUrl":"10.1016/j.elspec.2025.147514","url":null,"abstract":"<div><div>Low-energy high-resolution electron energy-loss spectroscopy (HREELS) is a useful technique for the characterization of various excitation processes at solid surfaces. However, no successful work has been reported on molecular single-crystal samples yet. In the present study, low-energy angle-resolved HREELS measurements were conducted on single-crystal pentacene, an organic semiconductor. The results confirmed the excitonic bands exhibiting energy–momentum dispersion and anisotropy of these depending on the surface crystallographic directions, corroborating the occurrence of exciton delocalization, contrary to the ordinary notion of the Frenkel exciton for weakly interacting van der Waals molecular solids. The present results demonstrate that low-energy angle-resolved HREELS is applicable to the precise examination of the excitonic characteristics of solid-state surfaces, even for molecular semiconductor single crystals.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"279 ","pages":"Article 147514"},"PeriodicalIF":1.8,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143140829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time evolution of ion states formed during the cascade decay of vacancies produced by the electron capture decay of the 125I radionuclide","authors":"A.P. Chaynikov ,&nbsp;A.G. Kochur ,&nbsp;A.I. Dudenko","doi":"10.1016/j.elspec.2025.147522","DOIUrl":"10.1016/j.elspec.2025.147522","url":null,"abstract":"<div><div>Cascade relaxation of inner-shell vacancies in tellurium atom produced by the electron capture decay of the ¹²⁵I radionuclide is studied using Monte Carlo simulations. Final cascade ions yields and mean final ion charges upon the decay of single-inner-vacancy states Te<em>X</em>^–15<em>p</em>⁵ (<em>X</em> = 1 <em>s</em> to 5 <em>s</em>) were calculated. The time evolution of the cascade ion states is simulated, and the mean final ion charge is found to be stabilized within <em>τ</em>_casc = 10^–12 s after the electron capture decay of the ¹²⁵I nucleus. This time interval must be compared to the time <em>τ</em>_neutr needed for ions neutralization when ¹²⁵I is used as an Auger emitter in radiotherapy. Depending on the relation between <em>τ</em>_casc and <em>τ</em>_neutr, either ‘isolated-atom’ or ‘condensed-phase’ approximation should be used in theoretical descriptions of local energy deposition.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"279 ","pages":"Article 147522"},"PeriodicalIF":1.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143140828","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}

{"title":"Density functional theory calculations of the electronic structure and dielectric properties of metal oxide systems Al2O3, MgO, Cu2O, TiO2, WO3","authors":"Raul E. Gutierrez ,&nbsp;Ivana Matanovic ,&nbsp;Maciej P. Polak ,&nbsp;Dane Morgan ,&nbsp;Edl Schamiloglu","doi":"10.1016/j.elspec.2024.147512","DOIUrl":"10.1016/j.elspec.2024.147512","url":null,"abstract":"<div><div>Density Functional Theory is utilized to study the electronic structure and dielectric properties of various metal oxide systems (Al₂O₃, MgO, Cu₂O, TiO₂, WO₃) in comparison to their base metals (Al, Mg, Cu, Ti, and W). The properties studied include the density of states, energy band gap, Fermi energy, work function, ionization potential, and the frequency- and momentum-dependent energy loss function. This work provides high-quality first principles-calculated properties that can be further utilized in computational simulations which aim to model complicated electron inelastic scattering interactions in metal oxides and their corresponding metals. In general, properties of this nature might be of interest, but not limited, to those involved in the multipactor effect, magnetic confinement fusion, photovoltaics, charged particle accelerators, x-ray photoelectron spectroscopy, Auger electron spectroscopy, and photomultipliers.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"278 ","pages":"Article 147512"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180515","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}

{"title":"XPS study on the oxidation-induced segregation behavior of U–Nb alloy","authors":"Ruidong Liu,&nbsp;Xiaofang Wang,&nbsp;Lizhuo Luo,&nbsp;Yin Hu,&nbsp;Jianwei Qin,&nbsp;Yongchu Rao","doi":"10.1016/j.elspec.2024.147513","DOIUrl":"10.1016/j.elspec.2024.147513","url":null,"abstract":"<div><div>In this work, the surface structure and chemical composition of U–Nb alloy after one year of oxidation under ambient conditions were investigated using X-ray photoelectron spectroscopy (XPS) depth profile methods. Furthermore, the in-situ oxidation of U–Nb was carried out under UHV conditions, providing insights into the initial oxidation behavior of U-Nb. Studies show that, an thin (1.5 nm) layer of UO₂ intermixed with enriched Nb₂O₅ is formed on the top of the naturally oxidized U–Nb, with an inner oxide layer consisting of UO_2-x intermixed with depleted NbO₂ and NbO at below, followed by an inner layer of UO_2-x intermixed with metallic U and Nb adjacent to the U-Nb substrate. During the initial oxidation stage, U oxidizes rapidly to form UO_2-x, while the leaving Nb in the UO_2-x lattice migrates inward and enriched at the metal side of the oxide/metal interface. As oxidation continues, oxidation-induced segregation of the leaving Nb in the UO_2-x lattice toward the surface occurs and forms NbO and NbO₂ at the gas-oxide interface. The affinities of U and Nb to OH and O anions may act as the driving force of the segregation.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"278 ","pages":"Article 147513"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104952","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}