TMC-1和L134N中乙腈丰度的上限：化学意义

Upper limits for the ethyl-cyanide abundances in TMC-1 and L134N: chemical implications.

作者信息

Minh Y C, Irvine W M

机构信息

Department of Physics and Astronomy, University of Massachusetts, Amherst, USA.

出版信息

Astrophys Space Sci. 1991;175:165-9. doi: 10.1007/BF00644434.

DOI:10.1007/BF00644434

PMID:11538286

Abstract

We have sought interstellar ethyl-cyanide via its 2(02)-1(01) transition towards two cold, dark clouds and report upper limits of the total column densities of 3 x 10(12) cm-2 and 2 x 10(12) cm-2 for TMC-1 and L134N, respectively. We also observed the 2(02)-1(01) transition of vinyl cyanide previously identified in TMC-1 by Matthews and Sears (1983b). The detection of vinyl cyanide and the non-detection of ethyl cyanide in TMC-1 are consistent with gas phase ion-molecule chemical models, and there is thus no necessity of invoking grain surface synthesis for vinyl cyanide in cold clouds.

摘要

我们通过其2(02)-1(01)跃迁，对两片寒冷的暗云寻找星际乙腈，并分别报告了TMC-1和L134N的总柱密度上限为3×10¹² cm⁻²和2×10¹² cm⁻²。我们还观测了先前由马修斯和西尔斯（1983b）在TMC-1中鉴定出的氯乙烯的2(02)-1(01)跃迁。在TMC-1中检测到氯乙烯而未检测到乙腈，这与气相离子-分子化学模型一致，因此没有必要在冷云中调用颗粒表面合成来解释氯乙烯的存在。