Journal of Electron Spectroscopy and Related Phenomena最新文献_第3页

Cascade energy reemission by the silver atom ionized by 0.01–100 keV photons. Possible application of silver-based radiosensitizing agents in photon beam radiation therapy 被 0.01-100 千伏光子电离的银原子的级联能量再发射。银基放射增敏剂在光子束放射治疗中的可能应用

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-07-18 DOI: 10.1016/j.elspec.2024.147472

Alexander P. Chaynikov , Andrei G. Kochur , Aleksey I. Dudenko

{"title":"Cascade energy reemission by the silver atom ionized by 0.01–100 keV photons. Possible application of silver-based radiosensitizing agents in photon beam radiation therapy","authors":"Alexander P. Chaynikov , Andrei G. Kochur , Aleksey I. Dudenko","doi":"10.1016/j.elspec.2024.147472","DOIUrl":"10.1016/j.elspec.2024.147472","url":null,"abstract":"<div><p>A method of straightforward construction and analysis of the cascade decay trees is applied to study the cascade energy reemission by silver atoms upon photoionization in the incident photon energy range of 0.01–100 keV. Cascade electrons and photons emitted during the cascade relaxation of an inner-shell vacancy carry away a significant part of the energy initially acquired by the silver atom in a photoionization act. The energies redistributed through following channels were calculated as functions of incident photon energy: energy absorbed by the silver atom itself (<em>a</em>), and energies carried away by the cascade electrons (<em>b</em>) and photons (<em>c</em>). Channel (<em>a</em>) is dominant only at small incident photon energies up to the <em>M</em><sub>5</sub> ionization threshold. Channel (<em>b</em>) dominates between <em>M</em> and <em>K</em> thresholds making 57–85 % of the acquired energy. Above the <em>K</em> threshold, the weight of channel (<em>b</em>) is still significant, 24 %, however, dominant is channel (<em>c</em>).</p></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"275 ","pages":"Article 147472"},"PeriodicalIF":1.8,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141775107","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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Gas-phase PES and GW investigation of two widespread herbicides: MCPA and 2,4-dichlorophenoxyacetic acid 对两种广泛使用的除草剂进行气相 PES 和 GW 研究：MCPA 和 2,4-二氯苯氧乙酸

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-07-14 DOI: 10.1016/j.elspec.2024.147462

Ivar Kuusik , Mati Kook , Tanel Käämbre , Georgia Michailoudi , Arvo Tõnisoo , Vambola Kisand , Rainer Pärna

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Laser induced ultrafast Gd 4f spin dynamics at the surface of amorphous CoxGd100-x ferrimagnetic alloys 非晶 CoxGd100-x 铁磁合金表面的激光诱导超快 Gd 4f 自旋动力学

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-07-11 DOI: 10.1016/j.elspec.2024.147461

M. Pacé , D. Gupta , T. Ferté , M. Riepp , G. Malinowski , M. Hehn , F. Pressacco , M. Silly , F. Sirotti , C. Boeglin , N. Bergeard

{"title":"Laser induced ultrafast Gd 4f spin dynamics at the surface of amorphous CoxGd100-x ferrimagnetic alloys","authors":"M. Pacé , D. Gupta , T. Ferté , M. Riepp , G. Malinowski , M. Hehn , F. Pressacco , M. Silly , F. Sirotti , C. Boeglin , N. Bergeard","doi":"10.1016/j.elspec.2024.147461","DOIUrl":"10.1016/j.elspec.2024.147461","url":null,"abstract":"<div><p>We have investigated the laser induced ultrafast dynamics of Gd 4f spins at the surface of Co<sub>x</sub>Gd<sub>100-x</sub> alloys by means of surface-sensitive and time-resolved dichroic resonant Auger spectroscopy. We have observed that the laser induced quenching of Gd 4f magnetic order at the surface of the Co<sub>x</sub>Gd<sub>100-x</sub> alloys occur on a much longer time scale than that previously reported in “bulk sensitive” time-resolved experiments. In parallel, we have characterized the static structural and magnetic properties at the surface and in the bulk of these alloys by combining Physical Property Measurement System (PPMS) magnetometry with X-ray Magnetic Circular Dichroism in absorption spectroscopy (XMCD) and X-Ray Photoelectron spectroscopy (XPS). The PPMS and XMCD measurements give information regarding the composition in the bulk of the alloys. The XPS measurements show non-homogeneous composition at the surface of the alloys with a strongly increased Gd content within the first layers compared to the nominal bulk values. Such larger Gd concentration results in a reduced indirect Gd 4f spin-lattice coupling. It explains the “slower” Gd 4f demagnetization we have observed in our surface-sensitive and time-resolved measurements compared to that previously reported by “bulk-sensitive” measurements.</p></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"275 ","pages":"Article 147461"},"PeriodicalIF":1.8,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141775048","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}

引用次数: 0

Scale transformations in model exchange potentials in low energy electron-atom scattering 低能电子原子散射中模型交换势的尺度变换

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-07-04 DOI: 10.1016/j.elspec.2024.147460

Felipe Arretche , Eliton P. Seidel , Wagner Tenfen

{"title":"Scale transformations in model exchange potentials in low energy electron-atom scattering","authors":"Felipe Arretche , Eliton P. Seidel , Wagner Tenfen","doi":"10.1016/j.elspec.2024.147460","DOIUrl":"https://doi.org/10.1016/j.elspec.2024.147460","url":null,"abstract":"<div><p>Model exchange potentials are particularly interesting to account for the indistinguishability between the projectile and target electrons in electron-atom scattering in vacuo and plasma environments. It is well known that their performance is pretty satisfactory in the high energies but also that discrepancies from the results obtained with exact exchange are found toward the zero energy limit. In this article, we examine how well established model exchange potentials based on the free electron gas approach compare to phase shifts calculated considering exchange in exact form. In particular, we show that the Hara and the semiclassical exchange potentials are able to reproduce reference low energy phase shifts through a simple scale transformation, in opposition to the previous approaches where energy dependent corrections to the local momentum were adopted. We provide the scale factors and phase shifts for electron scattering by He, Ne and Ar atoms for <span><math><mrow><mi>k</mi><mo><</mo></mrow></math></span> 1,0 a<span><math><msubsup><mrow></mrow><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msubsup></math></span>. Such scaling factors can be determined reproducing the scattering length and the number of s-wave bound states from exact exchange calculations. We also show that the scaling procedure works for electronic densities that present the physically correct asymptotic behavior. The present results are important to the research field, since they form the basis to construction of scattering models based on optical potential approaches.</p></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"274 ","pages":"Article 147460"},"PeriodicalIF":1.8,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141592970","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}

引用次数: 0

Further study of exchange-correlation functionals for the calculations of outer-valence ionization potentials of gas-phase molecules 用于气相分子外价电离势计算的交换相关函数的进一步研究

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-24 DOI: 10.1016/j.elspec.2024.147459

Maximiliano Segala , Delano P. Chong

引用次数: 0

Reassessment of the Shirley and model functions within X-ray photoelectron spectroscopy analysis utilizing comprehensive search methodologies of Bayesian inference 利用贝叶斯推理的综合搜索方法重新评估 X 射线光电子能谱分析中的雪莉和模型功能

IF 1.9 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-08 DOI: 10.1016/j.elspec.2024.147450

Genki Suzuki , Eiji Ikenaga , Satoshi Ogawa , Yuichi Yokoyama , Masaichiro Mizumaki

{"title":"Reassessment of the Shirley and model functions within X-ray photoelectron spectroscopy analysis utilizing comprehensive search methodologies of Bayesian inference","authors":"Genki Suzuki , Eiji Ikenaga , Satoshi Ogawa , Yuichi Yokoyama , Masaichiro Mizumaki","doi":"10.1016/j.elspec.2024.147450","DOIUrl":"https://doi.org/10.1016/j.elspec.2024.147450","url":null,"abstract":"<div><p>The analysis of X-ray photoelectron spectra often faces challenges due to the lack of standardization in modeling approaches, background subtraction methods, and computational algorithms within the field of computer science. The interpretation of XPS data significantly relies on the unique expertise and judgment of individual researchers. Therefore, the objective of this study is to highlight the difficulties associated with analytical methods that depend heavily on the discretion of individual scientists, to elucidate the prevailing models and background subtraction techniques, and to suggest improvements to these methodologies. This endeavor aims to enhance the reliability and reproducibility of XPS analysis, thereby contributing to the advancement of research in this area. By utilizing the information criterion as part of a thorough search methodology in Bayesian inference, we show that our sophisticated analytical techniques significantly outperform others in the analysis of actual X-ray photoelectron spectroscopy (XPS) spectra. This improvement is evidenced through enhanced accuracy and reliability in spectral interpretation, underscoring the efficacy of our methods in practical applications of XPS.</p></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"274 ","pages":"Article 147450"},"PeriodicalIF":1.9,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0368204824000331/pdfft?md5=ec2601473e7e650e86fb2cb4e70e4418&pid=1-s2.0-S0368204824000331-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141292010","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}

引用次数: 0

Mn 2p and O 1s X-ray absorption spectroscopy of manganese oxides 锰氧化物的 Mn 2p 和 O 1s X 射线吸收光谱学

IF 1.9 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-08 DOI: 10.1016/j.elspec.2024.147452

Haytham Eraky , James J. Dynes , Adam P. Hitchcock

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Corrigendum to “Dissociative electron attachment to 1- and 9-chloroanthracene in the gas phase” [J. Electron Spectrosc. Relat. Phenom. 267 (2023) 147383] 气相中1-氯蒽和9-氯蒽的解离电子附著更正[J]。电子Spectrosc。遗传代数。飞鸿。267 (2023)147383]

IF 1.9 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-01 DOI: 10.1016/j.elspec.2023.147415

N.L. Asfandiarov , M.V. Muftakhov, S.A. Pshenichnyuk

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Introduction to special issue on X-ray spectromicroscopy X 射线光谱学特刊简介

IF 1.9 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-01 DOI: 10.1016/j.elspec.2024.147438

Adam P. Hitchcock , Nobuhiro Kosugi

引用次数: 0

Bayesian inference method utilizing SESSA in quantitative layer structure estimation from XPS data 利用 SESSA 的贝叶斯推理方法从 XPS 数据中估算定量层结构

IF 1.9 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2024-06-01 DOI: 10.1016/j.elspec.2024.147449

Atsushi Machida , Kenji Nagata , Ryo Murakami , Hiroshi Shinotsuka , Hayaru Shouno , Hideki Yoshikawa , Masato Okada

{"title":"Bayesian inference method utilizing SESSA in quantitative layer structure estimation from XPS data","authors":"Atsushi Machida , Kenji Nagata , Ryo Murakami , Hiroshi Shinotsuka , Hayaru Shouno , Hideki Yoshikawa , Masato Okada","doi":"10.1016/j.elspec.2024.147449","DOIUrl":"10.1016/j.elspec.2024.147449","url":null,"abstract":"<div><p>X-ray photoelectron spectroscopy (XPS) is a surface analysis technique for the nondestructive identification of elemental species and chemical states of solid samples, and the measured spectra are affected by not only sample-specific information but also factors dependent on the measurement environment. This feature makes it difficult to analyze the data for the chemical state identification of mixed samples when referring to the data measured with different models or in different environments. In a previous study, Bayesian inference was successfully applied to the analysis of XPS narrow-scan spectra, but the challenge was to apply Bayesian inference to XPS spectra of samples that are nonuniform in the depth direction. We propose a method to infer the layer structure of a sample from XPS spectra by incorporating Bayesian inference into the simulation of electron spectra for surface analysis (SESSA). SESSA can simulate XPS spectra of samples with specified composition and microstructure, and is already in use as a simulator with highly reproducible results. By utilizing the proposed method, one can estimate the layer structure of a sample from XPS data on the basis of the posterior probability distribution. In a typical XPS measurement, wide-scan data are acquired to qualitatively identify elemental species, and narrow-scan data are acquired to the estimate detailed composition and chemical state information of a sample. In this study, we have shown that given wide-scan or narrow-scan data without angle resolution, Bayesian inference can be applied to quantitatively analyze the layer structure information.</p></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"273 ","pages":"Article 147449"},"PeriodicalIF":1.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S036820482400032X/pdfft?md5=dbb403ed40878b1d61924f63795fc2b2&pid=1-s2.0-S036820482400032X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189445","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}

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