Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC

Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC
复制标题

HCN、HNC、DCN 和 DNC 的电子轰击旋转和超精细激发

DOI:
10.1111/j.1365-2966.2007.12416.x
复制
发表时间:
2007
影响因子:
4.8
通讯作者:
Faure A
Faure A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Faure A

文献摘要

参考文献

被引文献

相似文献

用分子R矩阵方法结合绝热核旋转近似,研究了热电子碰撞对HCN和HNc同位素的转动激发。得到了电子温度在5-6000K范围内的速率系数,以及J=8的所有能级之间的跃迁的速率系数。超精细速率也用无限级突然标度方法得到。结果表明,主要的转动跃迁是偶极允许的,即ΔJ=1的转动跃迁。超精细倾向规则ΔJ=Δf比He-hcn碰撞的情况更强。对于偶极允许的跃迁,电子碰撞速率比He原子激发HCN的速率高6个数量级。因此,在电子分数大于10−6的源中,例如在星际激波和彗星中,目前的速率应该包括在任何详细的HCN和HNc同位素布居模型中。
Rotational excitation of isotopologues of HCN and HNC by thermal electron-impact is studied using the molecular R-matrix method combined with the adiabatic-nuclei-rotation approximation. Rate coefficients are obtained for electron temperatures in the range 5–6000 K and for transitions among all levels up toJ= 8. Hyperfine rates are also derived using the infinite-order-sudden scaling method. It is shown that the dominant rotational transitions are dipole-allowed, that is, those for which ΔJ= 1. The hyperfine propensity rule ΔJ=ΔFis found to be stronger than that in the case of He–HCN collisions. For dipole-allowed transitions, electron-impact rates are shown to exceed those for excitation of HCN by He atoms by six orders of magnitude. As a result, the present rates should be included in any detailed population model of isotopologues of HCN and HNC in sources where the electron fraction is larger than 10−6, for example, in interstellar shocks and comets.
DOI: --
发表时间: 2006
影响因子: 8.6
作者:
R. Čurík;J. Ziesel;N. Jones;T. Field;D. Field
通讯作者: D. Field
碰撞诱导的 OH 超精细结构转变
DOI: --
发表时间: 1976
期刊:
影响因子: --
作者:
S. Chu
通讯作者: S. Chu
DOI: --
发表时间: 1978
期刊:
影响因子: --
作者:
S. Srivastava;H. Tanaka;A. Chutjian
通讯作者: A. Chutjian
DOI: --
发表时间: 2004
期刊:
影响因子: --
作者:
J. Gorfinkiel;J. Tennyson
通讯作者: J. Tennyson
线性分子离子的电子撞击旋转激发
DOI: 10.1046/j.1365-8711.2001.04480.x
发表时间: 2001
影响因子: 4.8
作者:
A. Faure;J. Tennyson
通讯作者: J. Tennyson