d+d B AB Definition. mean collision diameter. CAB
AB A B d d d = + 2 Definition: mean collision diameter: dAB
Definition S=T aB collision cross-section
Definition: collision cross-section 2 S = d AB
motionless AB nd2 B ABA V
2 Z AB = d AB V NB A A V NB motionless
When the concentration of A is nA/(molec. M-3)
When the concentration of A is NA /V (molec. M-3 ):
“碰撞数”,碰撞频率 2 NN AB- ABy V B不动
2 AB AB Z = d V N V NA B A “碰撞数”, 碰撞频率: B不动