A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

IF 4.8 2区 化学 Q2 CHEMISTRY, PHYSICAL The Journal of Physical Chemistry Letters Pub Date : 2022-11-21 DOI:10.1021/acs.jpclett.2c03175
Tonghui Yin, Liying Ma, Min Cheng* and Hong Gao*, 
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引用次数: 1

Abstract

As one of the most abundant molecules in the universe, the long history of spectroscopic studies of the dicarbon molecule, C2, reaches back two centuries. While many electronic band systems with upper states below the lowest dissociation threshold have been well characterized, much less is known about transitions to higher-lying states. Here, we report the observation of a new band system of C2 from the lowest triplet state a3Πu through a resonance-enhanced multiphoton ionization scheme. The upper state is identified as 13Σg+, which is determined to be 61539.0 cm–1 (7.630 eV) above ground state X1Σg+. The spectroscopic parameters determined for the 13Σg+ state are in excellent agreement with those predicted by the high-level ab initio calculations. This study paves the way for systematic investigations of the photoabsorption and photodissociation of C2 in the vacuum ultraviolet region, which has important applications in the field of astrochemistry.

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真空紫外区碳分子的新波段系统
作为宇宙中最丰富的分子之一,对碳分子C2进行光谱研究的悠久历史可以追溯到两个世纪以前。虽然许多具有低于最低解离阈值的较高状态的电子能带系统已被很好地表征,但对向较高状态的过渡知之甚少。在这里,我们报告了通过共振增强的多光子电离方案从最低三重态a3Πu观察到一个新的C2波段系统。上面的状态确定为13Σg+,确定在基态X1Σg+上方61539.0 cm-1 (7.630 eV)。为13Σg+态确定的光谱参数与高阶从头计算预测的结果非常吻合。本研究为系统研究C2在真空紫外区的光吸收和光解作用奠定了基础,在天体化学领域具有重要的应用价值。
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来源期刊
The Journal of Physical Chemistry Letters
The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
9.60
自引率
7.00%
发文量
1519
审稿时长
1.6 months
期刊介绍: The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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