Rotational relaxation in ultracold He+BH collisions
Rotational relaxation in ultracold He+BH collisions
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超冷 He BH 碰撞中的旋转弛豫
DOI：
10.1088/1674-1056/20/11/113401
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Gong Ming-Yan
中科院分区：
文献类型：
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作者：
Xu Xiao-Tao;Feng Er-Yin;Gong Ming-Yan
用量子力学散射公式研究了ν = 0能级的冷黑洞和超冷黑洞与He原子的碰撞。利用二维从头算势能面计算了弹性截面和非弹性截面。结果表明，弹性截面大于非弹性截面。当碰撞能量很低时，弹性截面遵循Wigner阈值定律，比He-O2大一个数量级，比He-H2小得多。给出了旋转淬火态的效率。Δj =−1的转换是最有效的。共振也被发现发生在大约相同的平动能量（0.1-1 cm−1）下，这使得速率系数在0.1-1 K左右的温度下上升。
Collisions of cold and ultracold BH in the ν = 0 level with the He atom are investigated using the quantum mechanical scattering formulation. The elastic and the inelastic cross sections are calculated using the two-dimensional ab initio potential energy surface. It is shown that the elastic cross section is larger than the inelastic one. When the collision energy is very low, the elastic cross section follows the Wigner threshold law and is one order of magnitude larger than that of He-O2, while it is much smaller than that of He-H2. The efficiency of the rotationally quenching state is given. The Δj = −1 transition is most efficient. The resonances are also found to occur at about the same translational energy (0.1–1 cm−1), which gives rise to steps in the rate coefficient at temperatures around 0.1–1 K.