Theoretical research of the time dependence on molecules concentration in triplet state under excitation organic compounds have been carried out by light pulses with high. The computer simulation of the molecular dependence on the triplet level population of time during the excitation pulse and after its ending have been realized by using the obtained analytic expressions. It is shown that for a certain relation between the rate constants of intra molecular transitions and the excitation pulse duration, the triplet level population can increase several times after excitation ending. It is due to the transition of molecules which it were in the excited singlet state at the end of the excitation pulse to the triplet state. Note that this effect must be considered in the study of dynamic of photo physical processes and photochemical reactions taking place with the participation of triplet states of organic molecules when they are excited by short light pulses of high intensity.

在激发有机化合物的作用下，三重态下分子浓度与时间的关系的理论研究已经通过高强度的光脉冲进行。通过使用所获得的解析表达式，已经实现了分子对三重态水平时间激发期间和结束时的分子依赖性的计算机模拟。结果表明，对于分子内跃迁的速率常数和激发脉冲持续时间之间的某种关系，激发结束后三重态能级种群可以增加数倍。这是由于在激发脉冲结束时处于激发单重态的分子转变为三重态。