首页    期刊浏览 2025年07月07日 星期一
登录注册

文章基本信息

  • 标题:Discovery of a new molecular ion, HC7NH+, in TMC-1
  • 本地全文:下载
  • 作者:C.Cabezas ; M.Agúndez ; N.Marcelino
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2022
  • 卷号:659
  • 页码:1-5
  • DOI:10.1051/0004-6361/202142972
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要:We report the detection of the protonated form of HC7N in TMC-1. The discovery of the cation HC7NH+ was carried out via the observation of nine harmonically related lines in the Q-band using the Yebes 40 m radiotelescope. The observed frequencies allowed us to obtain the rotational constants B0 = 553.938802 (160) MHz and D0 = 3.6292 (705) Hz. The identification of HC7NH+ is further supported by accurate ab initio calculations. We derived a column density of (5.5 ± 0.7) × 1010 cm−2 , which constitutes another piece of evidence for the identification of the carrier. In addition, we revised the HC7N column density and we derived a new value of (2.1 ± 0.2) × 1013 cm−2 . Hence, the abundance ratio HC7N/HC7NH+ is ∼380, while those for HC3N/HC3NH+ and HC5N/HC5NH+ are ∼230 and ∼240, respectively. Here, we discuss these results within the framework of a chemical model for protonated molecules in cold dense clouds.
  • 关键词:astrochemistry;ISM: molecules;ISM: individual objects: TMC-1;line: identification;molecular data
国家哲学社会科学文献中心版权所有