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Rotational Quenching Rate Coefficients For H_2 In Collisionswith H_2 From 2 To 10,000 K

机译:H_2与H_2碰撞2到10,000 K时H_2的旋转淬火速率系数

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摘要

Rate coefficients for rotational transitions in H_2 induced by H_2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H_2)_2 potential energy surface were performed. The potential energy surface used here has been demonstrated to be more reliable than surfaces used in previous work. Rotational transition cross sections with initial levels of J ≤ 8 were computed for collision energies ranging between 10~(-4) and 2.5 eV, and the corresponding rate coefficients were calculated for the temperature range 2 ≤ T ≤ 10,000 K. In general, agreement with earlier calculations, which were limited to 100-6000 K, is good, although discrepancies are found at the lowest and highest temperatures. Low-density-limit cooling functions due to para- and ortho-H_2 collisions are obtained from the collisional rate coefficients. Implications of the new results for nonthermal H_2 rotational distributions in molecular regions are also investigated.
机译:提出了由H_2冲击引起的H_2旋转跃迁的速率系数。基于最近发布的(H_2)_2势能面进行了广泛的量子力学耦合通道计算。已经证明,此处使用的势能表面比以前的工作中使用的表面更可靠。计算碰撞能量在10〜(-4)和2.5 eV之间的初始能级J≤8的旋转过渡截面,并在2≤T≤10,000 K的温度范围内计算出相应的速率系数。尽管在最低和最高温度下发现了差异,但采用较早的计算(限于100-6000 K)还是不错的。从碰撞率系数中获得了由于对位和邻位H_2碰撞引起的低密度极限冷却函数。还研究了新结果对分子区域中非热H_2旋转分布的影响。

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