Dissociative recombination of CH2NH2+: a crucial link with interstellar methanimine and Titan ammonia

被引：17

作者：

Yuen, C. H. ^{[1
]}

Ayouz, M. A. ^{[2
]}

Balucani, N. ^{[3
,4
]}

Ceccarelli, C. ^{[4
]}

Schneider, I. F. ^{[5
,6
]}

Kokoouline, V. ^{[1
]}

机构：

[1] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[2] Univ Paris Saclay, Cent Supelec, LGPM, 8-10 Rue Joliot Curie, F-91190 Gif Sur Yvette, France

[3] Univ Perugia, Dipartimento Chim Biol & Biotecnol, Via Elce di Sotto, I-06123 Perugia, Italy

[4] IPAG, 120 Rue Piscine, F-38041 Grenoble, France

[5] Normandie Univ, Univ Havre, LOMC, CNRS,UMR6294, F-76058 Le Havre, France

[6] Univ Paris Saclay, Univ Paris Sud, ENS Cachan, Lab Aime Cotton,CNRS,UMR9188, F-91405 Orsay, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 484卷 / 01期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

astrochemistry; molecular data; molecular processes; scattering; planets and satellites: atmospheres; ISM: molecules; ATMOSPHERE; MOLECULES;

D O I：

10.1093/mnras/sty3514

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cross-sections for dissociative recombination (DR) and vibrational excitation of the CH2NH2+; ion in collisions with electrons are determined theoretically. The corresponding thermally averaged rate coefficients are computed and fitted to analytical formulas. The obtained DR rate coefficient is significantly smaller than the values recently employed in the photochemical models of the upper atmosphere of Titan, which has an important impact on the models that aim to reproduce the Titan ammonia abundance. On the other hand, the present results support the astrophysical models reproducing the abundance of the methanimine (CH2NH) detected in massive star formation regions. In these models, the CH2NH2+ DR is a major route of formation of this molecule with a high prebiotic potential.

引用

页码：659 / 664

页数：6

共 29 条

[1] EVALUATED BIMOLECULAR ION-MOLECULE GAS-PHASE KINETICS OF POSITIVE-IONS FOR USE IN MODELING PLANETARY-ATMOSPHERES, COMETARY COMAE, AND INTERSTELLAR CLOUDS [J].