Inelastic Mg+H collision data for non-LTE applications in stellar atmospheres
Inelastic Mg+H collision data for non-LTE applications in stellar atmospheres
复制标题
DOI：
10.1051/0004-6361/201219081
复制
发表时间：
2010-09
影响因子：
6.5
通讯作者：
P. Barklem;A. K. Belyaev;A. Spielfiedel;M. Guitou;N. Feautrier
中科院分区：
文献类型：
--
作者：
P. Barklem;A. K. Belyaev;A. Spielfiedel;M. Guitou;N. Feautrier
计算了Mg(3s(2)S-1，3s3p P-3，3s3p P-1，3s4s S-3，3s4s S-1，3s3d D-1，3s4p P-3)+H(1s)和Mg+(3s S-2)+H-离子态与最低7个能级之间的非弹性碰撞速率系数。速率系数是基于全量子散射计算的截面，而全量子散射计算本身是基于对MGH分子的详细量子化学计算。这些数据是在寒冷的天体物理环境，特别是寒冷的恒星大气中的非LTE应用所需要的，并且是在500-8000K的温度范围内提供的。从考虑截面对计算中各种不确定性的敏感性，最重要的是输入量子化学数据和散射计算的数值精度，估计了速率系数中可能的不确定性的度量。
Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer), namely Mg(3s(2) S-1, 3s3p P-3, 3s3p P-1, 3s4s S-3, 3s4s S-1, 3s3d D-1, 3s4p P-3)+H(1s) and Mg+(3s S-2)+H-. The rate coefficients are based on cross-sections from full quantum scattering calculations, which are themselves based on detailed quantum chemical calculations for the MgH molecule. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to various uncertainties in the calculations, most importantly input quantum chemical data and the numerical accuracy of the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.