The dipole oscillator sum can be expressed in terms of the integrated photo absorption cross section. 偶极谐振子和可以用积分后的光子吸收截面来表示。
The absorption spectrum and fluorescence spectrum of the two crystals were measured, the absorption cross section and emission cross section of the major peaks were calculated. 测得晶体的吸收光谱和荧光光谱，分别计算了两种晶体在主吸收峰的吸收截面和主发射峰的受激发射截面。
