选择性因子又称分配系数比、分离因子。色谱用语，相邻两组分的分配系数或容量因子之比。α=k2/k1（设k2>k1）。因k=t'R/t0，则α=t'R2/t'R1，所以α又称为相对保留时间（《美国药典》）。
分析了激光线宽对同位素原子激发电离效率和选择性因子的影响。
We have studied the influence of laser linewidth on ionized efficiency and selectivity of isotopic atoms.
讨论了硒代缩水甘油醚分子结构与保留因子、选择性因子和分离因子的关系。
The relationships between the separation parameters, such as retention factor, enantioselectivity and resolution, and the structures of glycidyl selenides were investigated.
在温度恒定的情况下，EPA - EE和DHA - EE的容量因子和选择性因子都随压力的升高而减小。
When temperature is constant, the capacity factors of both EPA-EE and DHA-EE and separation factors decrease with the increasing of pressure.
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