GAS-PHASE ELECTRONIC SPECTRA OF POLYACETYLENE CATIONS: RELEVANCE OF HIGHER EXCITED STATES

被引：11

作者：

Rice, C. A. ^{[1
]}

Rudnev, V. ^{[1
]}

Dietsche, R. ^{[1
]}

Maier, J. P. ^{[1
]}

机构：

[1] Univ Basel, Dept Chem, CH-4056 Basel, Switzerland

来源：

ASTRONOMICAL JOURNAL | 2010年 / 140卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

ISM: general; ISM: molecules; methods: laboratory; techniques: spectroscopic; DIFFUSE INTERSTELLAR BANDS; TRIACETYLENE CATION; RADICAL CATIONS; UNSATURATED-HYDROCARBONS; ABSORPTION-SPECTRA; NEON MATRICES; DIACETYLENE; SPECTROSCOPY; EMISSION; CHAINS;

D O I：

10.1088/0004-6256/140/1/203

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Transitions to higher electronic states of polyacetylene cations (HC2nH+, n = 4, 5, 6) have been measured in the gas phase at similar to 20 K. The absorption spectra were obtained using a resonant two-color, two-photon fragmentation technique in an ion trap, allowing a direct comparison between laboratory and astrophysical data. The purpose was to investigate the relevance of such transitions to astronomical observations because the general expectation is that the bands could be too broad due to fast intramolecular processes. It is shown that the origin bands are still narrow enough (1-10 cm(-1)) to be considered, especially as the higher-lying transitions often possess large oscillator strengths.

引用

页码：203 / 205

页数：3

共 29 条

[1] EMISSION-SPECTRA OF RADICAL CATIONS OF DIACETYLENE (A2PIV-]X2PIG),TRIACETYLENE (A2PIG-]X2PIV), AND TETRAACETYLENE (A2PIV-]X2PIG,000), AND LIFETIMES OF SOME VIBRONIC LEVELS OF A STATES [J].