强磁场中的Li原子  

The Li atom in a strong magnetic field

作　　者：刘凤丽[1] LIU Fengli(College of Physical Science and Technology,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学物理科学与技术学院,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2021年第6期742-747,共6页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(11474079)。

摘　　要：对于白矮星磁场中原子的结构和光谱问题研究在天体研究中十分重要,既能够确定磁化了的白矮星所具有的磁场大小,又有助于研究恒星向白矮星体的演化过程。采用改进的二维B-spline方法在柱坐标系下计算了在白矮星强磁场下Li原子的结构和电子空间几率密度,此方法对高激发态适用,对低激发态的计算也十分精准。Li原子采用模型势,选定磁感应强度分别为0.0001、0.001、0.01、0.1和1 a.u.,计算了Li原子的高激发态13^(2)0-和13^(2)(-2)^(+)的能级,同时,给出低激发态2^(2)(-2)^(+)的能级。计算结果表明,高激发态13^(2)0-和13^(2)(-2)^(+)的能级随磁感应强度增加而升高,而低激发态2^(2)(-2)^(+)的能级随磁感应强度增加而降低。本研究定量地分析了Li原子的高激发态13^(2)0^(-)及13^(2)(-2)^(+)的几率密度分布随磁感应强度的变化规律,并与低激发态2^(2)(-2)^(+)进行了比较,有助于进一步理解磁化的白矮星中复杂原子的电子运动行为。Studies of atomic energies and spectra in magnetic white dwarfs are of importance in astronomical application.One can determine the magnetic fields with the aid of discrete spectral lines,while information on the magnetic fields extracted from these spectra is crucial to understand the evolution of normal stars to magnetic white dwarfs.The two-dimensional B-spline approach is used in the cylindrical coordinate system to simulate energies of lithium in magnetic fields of white dwarf stars.The advantage of the current approach is that it can be applied to calculate both low-and high-lying states.The model potential is utilized for Li atom.Energy levels and probability density distributions are calculated for the two highly excited states 13^(2)0-,13^(2)(-2)^(+)and a lower excited state 2^(2)(-2)^(+)at 5 magnetic field strengths 0.0001,0.001,0.01,0.1 and 1 a.u..The obtained results show that the energy levels of the two highly excited states are raised with the increasing of the presented magnetic field strengths,while the lower excited state 2^(2)(-2)^(+)has opposite behavior.Moreover,the probability density distributions of the outer electron for the three excited states are presented,and a comparison is made with the three excited states.The results are helpful to understand the dynamic behaviour of electrons for complex atoms in magnetic white dwarfs.

关 键 词：LI原子 强磁场 能级 几率密度 

分 类 号：O562.1[理学—原子与分子物理]