Exploring photoionization of gas-phase free radicals with a widely tunable VUV laser at moderate spectral resolution

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-19 DOI:10.1063/5.0217178

H. L. Le, N. L. Chen, M. Jiang, C. Le Bris, C. Charrière, S. Boyé-Péronne, J.-C. Loison, U. Jacovella, B. Gans

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引用次数: 0

Abstract

The VUv Laser for Considering Astrophysical and Isolated Molecules (VULCAIMs) setup [Harper et al., Phys. Chem. Chem. Phys. 24, 2777 (2022)] integrates a narrow-bandwidth tunable vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) nanosecond-pulsed laser system (6–16 eV) and a photoelectron spectrometer, designed for recording high-spectral-resolution (rotationally resolved) photoelectron spectra of gas-phase free radicals. This approach usually needs beforehand medium-resolution synchrotron data to guide the selection of specific spectral regions to be investigated at higher resolution with the VULCAIM setup. We present an upgraded version of the VUV laser system integrating an optical parametric oscillator for continuously scanned medium-resolution measurements (<3 cm−1) across the whole VUV and XUV spectral ranges. This innovation enables broader coverage without the need to access synchrotron facilities. Furthermore, rapid mode switching allows for maintaining optimized radical production conditions from mid-resolution to high-resolution operation mode, enhancing spectroscopy capabilities significantly. The new capabilities of the VULCAIM setup are illustrated on two showcases of photoionization studies: the nitric oxide (NO) stable molecular species and the benzyl (C6H5CH2) free radical produced by pyrolysis.

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用光谱分辨率适中的宽调谐紫外激光器探索气相自由基的光电离现象

考虑天体物理和孤立分子的真空紫外激光（VULCAIMs）装置[Harper 等人，Phys. Chem. Chem. Phys. 24, 2777 (2022)]集成了窄带宽可调真空紫外（VUV）和极紫外（XUV）纳秒脉冲激光系统（6-16 eV）和光电子能谱仪，设计用于记录气相自由基的高光谱分辨率（旋转分辨）光电子能谱。这种方法通常需要事先获得中等分辨率的同步辐射数据，以指导选择特定光谱区域，利用 VULCAIM 装置进行更高分辨率的研究。我们展示了集成了光学参量振荡器的升级版紫外激光系统，可在整个紫外和可见紫外光谱范围内连续扫描中等分辨率测量（<3 cm-1）。这一创新技术可实现更广泛的覆盖范围，而无需使用同步辐射设施。此外，快速模式切换功能允许从中分辨率操作模式到高分辨率操作模式保持优化的自由基生产条件，从而大大增强了光谱分析能力。VULCAIM 装置的新功能在两个光离子化研究案例中得到了展示：一氧化氮（NO）稳定分子物种和热解产生的苄基（C6H5CH2）自由基。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.