Ion Spectroscopy in the Context of the Diffuse Interstellar Bands: A Case Study with the Phenylacetylene Cation

IF 2.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Thomas E. Douglas-Walker, Ewen K. Campbell*, Francis C. Daly, Stéphane Douin, Bérenger Gans, Ugo Jacovella*, Colombe Maurice, Robin Odant and Julianna Palotás, 
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Abstract

Identification of the molecular carriers of diffuse interstellar bands (DIBs) requires gas phase electronic spectra of suitable candidate structures. Recording the spectra of these in the laboratory is challenging because they include large, carbon-rich molecules, many of which are likely to be ionic. The electronic spectra of ions are often obtained using action spectroscopy methods, which can induce small perturbations to the absorption characteristics and hinder comparison with astronomical observations. In this contribution, the appropriateness of helium-tagging and two-color resonant-enhanced photodissociation spectroscopy as suitable techniques to obtain the requisite laboratory data for comparison to DIBs is explored. As a proof-of-concept, the C̃ 2B1 ← X̃ 2B1 electronic transition of the phenylacetylene cation (PA+, C8H6+), obtained by helium-tagging and two-color photodissociation, is compared to the direct absorption spectrum recorded using cavity ring-down spectroscopy. The results indicate that for DIBs with typical widths of a few ångströms, the wavelengths, bandwidths, and relative intensities from action spectroscopy are obtained with sufficient precision to facilitate accurate comparisons to catalogued DIBs.

漫射星际波段中的离子光谱学:以苯乙炔阳离子为例
鉴别弥漫星际带(DIBs)的分子载体需要合适的候选结构的气相电子谱。在实验室中记录它们的光谱是具有挑战性的,因为它们包括大的、富含碳的分子,其中许多可能是离子的。离子的电子能谱通常是用作用光谱法获得的,这种方法会对吸收特性产生微小的扰动,妨碍与天文观测的比较。在这一贡献,适当的氦标记和双色共振增强光解光谱作为合适的技术,以获得必要的实验室数据,比较dib进行了探讨。作为概念验证,将氦标记和双色光解得到的苯乙炔阳离子(PA+, C8H6+)的C→2B1←X→2B1电子跃迁与用腔衰荡法记录的直接吸收光谱进行了比较。结果表明,对于典型宽度为ångströms的dib,从作用光谱中获得的波长、带宽和相对强度具有足够的精度,可以与已编目的dib进行准确的比较。
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来源期刊
ACS Earth and Space Chemistry
ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology
CiteScore
5.30
自引率
11.80%
发文量
249
期刊介绍: The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.
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