原子和分子氢对NH3的碰撞激发
Collisional excitation of NH3 by atomic and molecular hydrogen
摘要：
我们报告了大量的理论计算旋转反转激发星际氨（NH3）由于碰撞原子和分子氢（包括对位和邻位H2）。紧耦合计算的总能量范围在1-2000 cm-1和旋转截面之间的最低的17和34个旋转反转水平的邻位和对位NH3，分别获得所有的过渡。速率系数推导动力学温度高达200 K。倾向规则的三个碰撞的合作伙伴进行了讨论，我们也比较了新的结果，以前的计算球对称的他和para-H2弹丸。在不同的计算集之间发现了显著差异。最后，我们测试了新的速率系数对氨温度计校准的影响。我们发现，校准曲线是只有弱敏感的碰撞伙伴，我们确认氨温度计是强大的。
英文摘要：
We report extensive theoretical calculations on the rotation-inversion excitation of interstellar ammonia (NH3) due to collisions with atomic and molecular hydrogen (both para- and ortho-H2). Close-coupling calculations are performed for total energies in the range 1-2000 cm-1 and rotational cross sections are obtained for all transitions among the lowest 17 and 34 rotation-inversion levels of ortho- and para-NH3, respectively. Rate coefficients are deduced for kinetic temperatures up to 200 K. Propensity rules for the three colliding partners are discussed and we also compare the new results to previous calculations for the spherically symmetrical He and para-H2 projectiles. Significant differences are found between the different sets of calculations. Finally, we test the impact of the new rate coefficients on the calibration of the ammonia thermometer. We find that the calibration curve is only weakly sensitive to the colliding partner and we confirm that the ammonia thermometer is robust.
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