论文标题
水和电子碰撞在彗星中HF旋转激发中的影响
The effect of water and electron collisions in the rotational excitation of HF in comets
论文作者
论文摘要
我们介绍了与水分子碰撞（彗星昏迷中的主要对撞机，在5-150 K温度范围内）诱导的7个最低氟化氢（HF）的旋转激发的第一组速率系数。通过量子统计方法从准确的刚性转子的起始相互作用电位中进行计算。在10-10,000 k温度范围内，还计算出电子影响HF激发HF的速率系数。然后将这些速率系数用于彗星昏迷的简化非本地热力学平衡（非L-LTE）模型，该模型还包括太阳辐射泵送和辐射衰变。我们研究了导致HF旋转水平的非LTE种群的H2O密度范围。我们表明，要描述彗星中HF的激发，考虑到HF的大偶极子，需要考虑与水分子和电子的碰撞。
We present the first set of rate coefficients for the rotational excitation of the 7 lowest levels of hydrogen fluoride (HF) induced by collision with water molecules, the dominant collider in cometary comas, in the 5-150 K temperature range. The calculations are performed with a quantum statistical approach from an accurate rigid rotor ab initio interaction potential. Rate coefficients for excitation of HF by electron-impact are also computed, within the Born approximation, in the 10-10,000 K temperature range. These rate coefficients are then used in a simplified non-local thermodynamic equilibrium (non-LTE) model of a cometary coma that also includes solar radiative pumping and radiative decay. We investigate the range of H2O densities that lead to non-LTE populations of the rotational levels of HF. We show that to describe the excitation of HF in comets, considering collisions with both water molecules and electrons is needed as a result of the large dipole of HF.
