Detection of the linear radical HC4N in IRC+10216

被引：44
|
作者：
Cernicharo, J
Guelin, M
Pardo, JR
机构：
[1] CSIC, Inst Estructura Mat, Dept Mol & Infrared Astrophys, Madrid 28006, Spain
[2] Inst Radioastron Millimetr, F-38406 St Martin Dheres, France
来源：
ASTROPHYSICAL JOURNAL | 2004年 / 615卷 / 02期
关键词：
astrochemistry; ISM : molecules; line : identification; stars : AGB and post-AGB; stars : individual (IRC+10216);
D O I：
10.1086/426439
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection of the linear radical HC4 N in the C- rich envelope of IRC + 10216. After HCCN, HC4N is the second member of the allenic chain family HC2nN observed in space. The column density of HC4N is found to be 1.5 x 10(12) cm(-2). The abundance ratio HC2N/HC4N is 9, a factor of 2 larger than the decrement observed for the cyanopolyynes (HC2n+1 N/HC2n+3N). Linear HC4N has a (3)Sigma electronic ground state and is one of the three low- energy isomeric forms of this molecule. We have searched for the bent and ringed HC4N isomers but could only derive an upper limit to their column densities: less than or equal to 3 x 10(12) cm(-2) (at 3 sigma).
引用
收藏
页码：L145 / L148
页数：4
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