气相中 C6H+ 和 C6H3+ 的电子光谱。

Electronic spectra of C6H+ and C6H3+ in the gas phase.

机构信息

Department of Chemistry, University of Basel, CH-4056 Basel, Switzerland.

出版信息

J Am Soc Mass Spectrom. 2010 May;21(5):694-7. doi: 10.1016/j.jasms.2010.01.005. Epub 2010 Jan 22.

DOI:10.1016/j.jasms.2010.01.005

PMID:20171899

Abstract

Measurement of the (3)Pi-(3)Pi transition of C(6)H(+) in the gas phase near 19486 cm(-1) is reported. The experiment was carried out with a supersonic slit-jet expansion discharge using cavity ringdown absorption spectroscopy. Partly resolved P lines and observation of band heads permitted a rotational contour fit. Spectroscopic constants in the ground and excited-state were determined. The density of ions being sampled is merely 2 x 10(8) cm(-3). Broadening of the spectral lines indicates the excited-state lifetime to be approximately 100 ps. The electronic transition of HC(6)H(2)(+) at 26402 cm(-1) assumed to be (1)A(1)-X (1)A(1) in C(2v) symmetry could not be rotationally resolved.

摘要

报道了气相中 C(6)H(+) 的 (3)Pi-(3)Pi 跃迁在 19486 cm(-1) 附近的测量结果。该实验采用超声速狭缝喷射扩展放电，使用腔衰荡吸收光谱法进行。部分分辨的 P 线和带头的观察允许进行旋转轮廓拟合。在基态和激发态确定了光谱常数。被采样的离子密度仅为 2 x 10(8) cm(-3)。谱线的展宽表明激发态寿命约为 100 ps。假设在 C(2v)对称性下为 (1)A(1)-X (1)A(1)的 HC(6)H(2)(+)的电子跃迁在 26402 cm(-1) 处不能进行旋转分辨。