【作者】 徐海； 郑沄； 樊政； 宁远航； 黄浩； 葛美华； 郑雨军； 孙振东；

【Author】 XU Hai;ZHENG Yun;FAN Zheng;NING Yuan-hang;HUANG Hao;GE Mei-hua;ZHENG Yun-ju;SUN Zhen-dong;School of Physics,Shandong University;

【机构】 山东大学物理学院；

【摘要】 微观粒子的相互作用碰撞截面是获得粒子结构等本身内部信息和粒子间输运动能特性的重要参数之一。虽然对简单原子分子在这方面有了一定的研究^[1],但研究的内容大多局限于获得分子在基态的行为信息。对于多原子分子受到激发后在激发态的碰撞截面变化的研究仍然很有限。在分析了成功利用的光诱导漂移技术机理的基础上^[2],计算分析了氟化甲烷、氨和甲醇三种振转模式有代表性的多原子分子在受到激发后它们相对于基态在激发态的碰撞频率、扩散系数和碰撞截面的相对变化。推导出了三者之间的关系,并对引起这些变化的物理原因作了比较分析,认为其与分子能级结构以及吸收和缓冲分子间相互作用势能函数中的势阱深度参数有关。计算结果和比较的结论为对这三种分子的实验观测提供了有效的指导和参考作用。更多还原

【Abstract】 The interaction collision cross-section of the microscopic particles is one of the key parameters for obtaining the internal properties of particles and the transmission performance among them.However,most studies in these aspects are limited for just simple molecules in their ground states^[1].We studied on polyatomic molecules,and we are interested in the relative changes of the interaction collision cross-section when the polyatomic molecules are manipulated into their excited states by using the technique of light induced drift^[2].After we analyzed the mechanism of light induced drift,we have calculated the relative variations in collision frequency,diffusion coefficient,and interaction collision cross-section for three reprehensive molecules in vibration-rotation mode of methyl fluoride,ammonia,and methanol.We have derived the formula among these three relative variations and analyzed the reasons in physics that caused these changes.The results about the changes in interaction collision crosssection of the excited molecules show that the distinct energy structure of the three molecules is the dominant factor.The results also provide guidance to the experimental observations by light induced drift for the three molecules studied.更多还原