类氢He^(+)在白矮星磁场范围赖曼系吸收谱的研究

Lyman absorption spectral lines of hydrogen-like He^(+) in white dwarf strength magnetic fields

采用发展的(Finite-basis-size)方法用(B-splines)基在典型的磁化白矮星强磁场中计算了类氢离子He^(+)的离散光谱。涉及到的磁场范围为2.35~2350 MG。计算共涉及9个磁化原子态,包含3种对称性0^(+)、0-和(-1)^(+),计算了8种电偶极跃迁的波长、振子强度和跃迁速率。此8种电偶极跃迁分别为10^(+)→ν0-(ν=1-4)和10^(+)→ν(-1)^(+)(ν=1-4)。计算结果显示此8种电偶极跃迁的波长均分布在紫外区域,当磁感应强度γ=0.2a.u时10^(+)→4(-1)^(+)跃迁属于弱跃迁。计算结果可作为天体物理的参考数据。

By using the recently developed finite-basis-set method with B-splines,the discrete spectra of hydrogen-like ion He^(+)have been calculated in a strong magnetic field typical of magnetic white dwarf stars.The magnetic field strengths involved ranged from 2.350 to 2350 MG.The calculation involves a total of 9 magnetized atomic states with the symmetries 0^(+),0-and(-1)^(+).The wavelengths,oscillator strengths and transition probabilities for eight the electric dipole transitions relevant to these magnetized atomic states are reported.The eight electric dipole transitions are 10^(+)→ν0-(ν=1-4)and 10^(+)→ν(-1)^(+)(ν=1-4),respectively.The calculated results show that the wavelengths of these eight electric dipole transitions are all distributed in the ultraviolet region and the transition 10^(+)→4(-1)^(+)atγ=0.2 au belong to weak transition.The results of this calculation can be employed as a reference data for astrophysics.