氦三原子系统的绝热超球研究
Adiabatic hyperspherical study of triatomic helium systems
摘要：
用绝热超球表象研究了4 He 3系统。我们采用目前最先进的氦相互作用势，包括延迟和非加性三体项，计算所有的三原子4 He系统的低能性质。计算了~ 4 He三聚体的束缚态能量、~ 4 He +~ 4 He_2弹性散射截面、三体复合和碰撞诱导解离速率。我们还处理了由两个4 He和一个3 He原子组成的系统，计算了同位素三聚体4 He 2 3 He的光谱、3 He +4 He 2的弹性散射截面、三体复合速率和有限温度下的碰撞诱导解离速率。研究了延迟和非加性三体项的影响。在某些情况下，延迟被发现是显着的，而三体项在这些系统中只起很小的作用。
英文摘要：
The 4He3 system is studied using the adiabatic hyperspherical representation. We adopt the current state-of-the-art helium interaction potential including retardation and the nonadditive three-body term, to calculate all low-energy properties of the triatomic 4He system. The bound state energies of the 4He trimer are computed as well as the 4He+4He2 elastic scattering cross sections, the three-body recombination and collision induced dissociation rates at finite temperatures. We also treat the system that consists of two 4He and one 3He atoms, and compute the spectrum of the isotopic trimer 4He2 3He, the 3He+4He2 elastic scattering cross sections, the rates for three-body recombination and the collision induced dissociation rate at finite temperatures. The effects of retardation and the nonadditive three-body term are investigated. Retardation is found to be significant in some cases, while the three-body term plays only a minor role for these systems.
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