气相中质子化聚乙炔HC2nH2+（n = 3,4）的电子吸收光谱。

Electronic absorption spectra of the protonated polyacetylenes HC2nH2+ (n=3,4) in the gas phase.

作者信息

Dzhonson Anatoly, Jochnowitz Evan B, Kim Eunsook, Maier John P

机构信息

Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.

出版信息

J Chem Phys. 2007 Jan 28;126(4):044301. doi: 10.1063/1.2430522.

DOI:10.1063/1.2430522

PMID:17286464

Abstract

A new approach has been developed for the purpose of measuring the electronic transitions to bound exited states for cations that have been collisionally relaxed to low vibrational and rotational temperatures. This has been used to obtain the first gas phase electronic spectra of the protonated polyacetylenes using a two-color ion-photodissociation approach. Specifically, the origin bands in the B (1)A(1)<-- X(1)A(1) transitions of HC(6)H(2) (+) and HC(8)H(2) (+) (C(2v) geometry) were observed at 26,403.3 and 21,399.8 cm(-1). Data on such cooled systems allow a direct comparison between laboratory and astrophysical measurements.

摘要

已开发出一种新方法，用于测量碰撞弛豫到低振动和转动温度的阳离子向束缚激发态的电子跃迁。这已被用于使用双色离子光解离方法获得质子化聚乙炔的首个气相电子光谱。具体而言，在26403.3和21399.8 cm⁻¹处观察到了HC(6)H(2)(+)和HC(8)H(2)(+)（C(2v)几何结构）的B(1)A(1)<--X(1)A(1)跃迁中的起始带。关于此类冷却系统的数据允许在实验室测量和天体物理测量之间进行直接比较。