Escape of H and D from Mars and Venus by energization with hot oxygen
Escape of H and D from Mars and Venus by energization with hot oxygen
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DOI：
10.1029/1999ja900157
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发表时间：
1999-07
影响因子：
--
通讯作者：
B. Shizgal
中科院分区：
文献类型：
--
作者：
B. Shizgal
本文采用动力学理论碰撞生成模型，计算了热氧碰撞能量转移过程中H和D的生成速度分布。高能氧原子是O ~（2+）解离复合的产物。用O-H和O-D碰撞的量子力学截面来确定产生分布。进入碰撞的粒子的分布被假定为麦克斯韦函数。速度高于逃逸速度的原子的比例是在金星和火星上确定的。对于金星，可用的密度和温度分布，以获得估计的H和D逃逸通量和分馏比。
A kinetic theory collisional production model is used to determine the product velocity distributions of H and D resulting from collisional energy transfer with hot oxygen. The energetic oxygen atoms are the products of the dissociative recombination of O2+. Quantum mechanical cross sections for O-H and O-D collisions are used to determine the production distributions. The distributions of the particles entering a collision are assumed to be Maxwellian functions. The fraction of atoms with speeds above the escape speed is determined for Venus and Mars. For Venus, available density and temperature profiles are used to obtain estimates of the H and D escape fluxes and fractionation ratios.