红宝石中自旋—晶格弛豫直接过程的计算

本文计算了在低温、低浓度下红宝石基态自旋-晶格弛豫的直接过程。应用强场耦合表象中基态的二级微扰波函数,在θ=90°,脉冲饱和法测量条件下,计算了基态四能级之间的无辐射跃迁几率。然后,用求解粒子数方程的方法,计算1.4°K的自旋-晶格弛豫时间。计算结果与Pace等人的实验结果较好地符合。

CALCULATION OF THE DIRECT PROCESS OF SPIN-LATTICE RELAXATION IN RUBY

The direct process of spin-lattice relaxation in the ground state of ruby of low concentration is calculated at low temperature. The nonradiative transition probabilities within the four ground sub-levels are calculated by aid of second-order wave functions obtained in the strong-field coupling scheme. Under the measured condition of impulse saturation at θ=90°, the spin-lattice relaxation time at 1.4°K is obtained by solving the rate equations. The calculated result conforms satisfactorily to the experimental data given by Pace et al.