New de-excitation rates of the open shell dicarbon monoxide C2O(X3 σ-) in collision with He(1S)

被引：6

作者：

Khadri, F. ^{[1
]}

Hachani, L. ^{[1
]}

Elabidi, H. ^{[2
]}

Hammami, K. ^{[1
]}

机构：

[1] Univ Tunis El Manar, Dept Phys, LSAMA, Fac Sci, Tunis 1060, Tunisia

[2] Umm Al Qura Univ, Dept Phys, Makkah Almukarramah 21955, Saudi Arabia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 513卷 / 04期

关键词：

molecular data; radiative transfer; scattering; ISM: molecules; ROTATIONAL-EXCITATION; HE; SPECTROSCOPY; MILLIMETER; MOLECULE; OCS;

D O I：

10.1093/mnras/stac1395

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In order to derive accurate physical conditions of the interstellar clouds (such as TMC-1) from the rotational transitions of C2O, collisional rates are needed. Based on a new two-dimensional potential energy surface (PES), we report a new rate coefficients calculation of C2O(X-3 sigma(-)) induced by collision with He. This PES was obtained from the explicitly correlated restricted open-shell coupled cluster with single, double, and perturbative triple excitation (rccsd(t)-f12) ab initio approach associated with aug-cc-pVTZ basis sets. The C2O-He PES presents one minimum below its dissociation limit with a well depth of 42.376 cm(-1). The close-coupling quantum time-independent formalism was used to derive cross sections for E <= 370 cm(-1) and N <= 10. De-excitation rate coefficients are obtained for thermal temperature below 80 K.

引用

页码：6152 / 6157

页数：6

共 27 条

[1] Potential energy surface and rate coefficients of protonated cyanogen (HNCCN+) induced by collision with helium (He) at low temperature [J].