中国物理B ›› 2011, Vol. 20 ›› Issue (11): 113401-113401.doi: 10.1088/1674-1056/20/11/113401

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Rotational relaxation in ultracold He+BH collisions

宫明艳, 许小涛, 凤尔银   

  1. Department of Physics, Anhui Normal University, Wuhu 241000, China
  • 收稿日期:2010-12-08 修回日期:2011-05-04 出版日期:2011-11-15 发布日期:2011-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10874001), the Key Grant Project of Chinese Ministry of Education (Grant No. 208057), the Natural Science Foundation of Anhui Province, China (Grant Nos. 070416236 and KJ2010B366), and the Natural Science Foundation of Anhui Normal University, China (Grant No. 160-720857).

Rotational relaxation in ultracold He+BH collisions

Gong Ming-Yan(宫明艳),Xu Xiao-Tao(许小涛), and Feng Er-Yin(凤尔银)†   

  1. Department of Physics, Anhui Normal University, Wuhu 241000, China
  • Received:2010-12-08 Revised:2011-05-04 Online:2011-11-15 Published:2011-11-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10874001), the Key Grant Project of Chinese Ministry of Education (Grant No. 208057), the Natural Science Foundation of Anhui Province, China (Grant Nos. 070416236 and KJ2010B366), and the Natural Science Foundation of Anhui Normal University, China (Grant No. 160-720857).

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摘要： Collisions of cold and ultracold BH in the v=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.

关键词: He-BH complex, cold collisions, rotation quenching, cross section

Abstract: Collisions of cold and ultracold BH in the $\nu=0$ 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.

Key words: He-BH complex, cold collisions, rotation quenching, cross section

中图分类号:  (Scattering of atoms and molecules)

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