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利用等温等压系综Monte Carlo方法, 在低温下(T = 10 K)研究了压力的变化(0~2.4 GPa)对固氩掺钠体系中杂质钠原子吸收光谱的影响. 对于替代数为nv = 1和2两种掺杂体系, 压力的增加都没有改变钠原子俘获点周围的局域对称性, 只是减小了钠氩、氩氩之间的距离, 使得体系更加致密. 但压力的增大导致了钠原子的吸收谱逐渐变宽, 峰位以及质心谱移向低能方向移动, 即出现红移. 对局域结构属于高对称俘获点nv =1的掺杂体系, 在较低压力下, 吸收谱为高对称三体线形. 随着压力的增加, 吸收谱开始变宽并移动, 吸收谱重叠成单峰形状. 对局域结构属于低对称性俘获点nv =2的掺杂体系, 在较低压力下, 吸收谱为单峰加双峰的吸收线形. 随着压力的增大, 单双峰之间的劈裂增大, 双峰重合成单峰形状.
The effects of pressure changes (0 ~ 2.4 GPa) on the absorption spectra of sodium impurities in the solid-argon-doped sodium system were investigated at low temperature (T = 10 K) using the isothermal and isometric ensemble Monte Carlo method. = 1 and 2 doping systems, the pressure increase did not change the local symmetry around the sodium atom capture point, but reduced the distance between sodium and argon, argon and argon, making the system more compact, but the pressure increase Resulting in the absorption spectrum of sodium atoms gradually broadening, the peak position and the center of mass spectrum to move toward the direction of low energy, that is, redshift.For the local structure of high symmetry capture point nv = 1 doping system, at lower pressures , The absorption spectrum is highly symmetric three-body line shape.With the increase of pressure, the absorption spectrum began to broaden and move, the absorption spectra overlap into a single peak shape.The local structure belongs to the doping system with low symmetry capture point nv = 2, At lower pressure, the absorption spectrum is a single peak plus bimodal absorption line shape. As the pressure increases, the cleavage between single and double peaks increases, and the double peaks recombine into a single peak shape.