The Effect of Electron Collisions on Rotational Populations of Cometary Water
The Effect of Electron Collisions on Rotational Populations of Cometary Water
复制标题
电子碰撞对彗星水旋转粒子群的影响
DOI：
--
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
M. Mumma
中科院分区：
文献类型：
--
作者：
Xing;M. Mumma
电子H2O碰撞率为令人兴奋的旋转过渡在彗星水的条件下发现哈雷在乔托航天器遇到评估。在0（00）-1（11）旋转跃迁的情况下，e-H2O碰撞速率超过了在距离彗核超过3000 km的中性-中性碰撞激发的速率。这些估计数的依据是对e-H2O碰撞的理论和实验研究、Giotto和Vega航天器上的仪器在现场获得的离子和电子参数以及从彗星电离层模型获得的结果。因此，在中间彗发中的水分子的旋转温度可能是由与电子的碰撞而不是与中性分子的碰撞来控制的，并且从哈雷彗星中的水的高分辨率红外光谱中检索到的旋转温度可能反映了中间彗发中的电子温度而不是中性气体温度。
The e-H2O collisional rate for exciting rotational transitions in cometary water is evaluated for conditions found in Comet Halley during the Giotto spacecraft encounter. In the case of the 0(00)-1(11) rotational transition, the e-H2O collisional rate exceeds that for excitation by neutral-neutral collisions at distances exceeding 3000 km from the cometary nucleus. The estimates are based on theoretical and experimental studies of e-H2O collisions, on ion and electron parameters acquired in situ by instruments on the Giotto and Vega spacecraft, and on results obtained from models of the cometary ionosphere. Thus, the rotational temperature of the water molecule in the intermediate coma may be controlled by collisions with electrons rather than with neutral molecules, and the rotational temperature retrieved from high-resolution IR spectra of water in Comet Halley may reflect electron temperatures rather than neutral gas temperatures in the intermediate coma.