首页|液体束光电子能谱测量水溶液相胸苷光电子谱:综合实验误差分析.

液体束光电子能谱测量水溶液相胸苷光电子谱:综合实验误差分析.

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水溶液中的光电子发射过程易受到由弹性及非弹性电子散射、流动势和空间电荷效应引起的误差和影响,然而,直接评估这些误差中各自贡献的大小仍是一项艰巨的挑战.本文以综合实验误差的形式评估了这些误差如何影响真实的光电子动能谱,利用飞秒液体束光电子能谱技术研究不同水溶液流速和激光能量下水溶液相胸苷的紫外光电子动能(或电子结合能)谱.实验中,利用液态水的1b1轨道的精确的竖直电子结合能值(11.33 eV)实现对观测到的水溶液相胸苷的电子结合能谱的校准,并估算出液态水的1b1轨道的精确的竖直电子结合能的综合实验误差约为200 meV.在不同的流速和激光能量条件下,水溶液相胸苷阳离子基态Do(π-1)和阳离子第一激发态D1(n-1)的竖直电子结合能的平均综合实验误差被估计为小于3%,即误差范围在几十毫电子伏特至200 meV之间.
Ultraviolet Photoemission Spectra of Aqueous Thymidine by Liquid-Microjet Photoelectron Spectroscopy:A Combined Experimental Error Assessment
Photoemissions from aqueous solu-tions are prone to elastic and inelas-tic electron scattering,streaming potential,and space charge effect errors;however,direct assessments of their individual contributions are still a daunting challenge.Herein,to assess how these errors in a com-bined experimental error manner in-fluence on the genuine photoelec-tron kinetic energy(PKE)spectra,the ultraviolet PKE(or electron binding energy,eBE)spectra of aqueous thymidine at different solu-tion flow rates and laser energies were investigated by femtosecond liquid-microjet photoelec-tron spectroscopy.The accurate vertical eBE value of 11.33 eV for the 1b1 orbital of liquid water was used to calibrate the observed eBE spectra of aqueous thymidine,and the corre-sponding combined experimental error for the eBE of the 1b1 orbital of liquid water was esti-mated to be about 200 meV.The average combined experimental error for the vertical eBE values of the cationic ground state D0(π-1)and the cationic first excited state D1(n-1)of aque-ous thymidine was estimated to be less than 3%,i.e.,in the range of several tens of meV to 200 meV,depending on different flow rates and laser energies.

Photoelectron spectroscopyLiquid microjetThymidineAqueous solutionStreaming potentialSpace chargeElectron scattering

徐漂、卢建夺、王冬冬、李多多、龙金友、张嵩、张冰

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武汉科技大学应用物理系,武汉 430081

中国科学院精密测量科学与技术创新研究院,波谱与原子分子物理国家重点实验室,武汉 430071

中国科学院大学,北京 100049

光电子能谱 液体束 胸苷 水溶液 流动势 空间电荷 电子散射

国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Knowledge Innovation Program of Wuhan-Basic ResearchKnowledge Innovation Program of Wuhan-Basic Research

2019YFA0307700122744182227311612074389119743812236301120220108010101342023020201010084

2024

化学物理学报(英文版)
中国物理学会

化学物理学报(英文版)

CSTPCDEI
影响因子:0.162
ISSN:1674-0068
年,卷(期):2024.37(2)
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