温度对激光场中N_2、O_2分子取向的影响  

Effect of Temperature on Alignment of N_2 and O_2 in Laser Field

作　　者：杨增强[1] 周效信[1,2] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]兰州重离子加速器国家重点实验室原子核理论研究中心,兰州730000

出　　处：《物理化学学报》2006年第8期932-936,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(10274063);教育部科技研究重点项目(03126)资助

摘　　要：由刚性转子(rigidrotors)模型出发,利用伪谱方法求解了含时薛定谔方程,从理论上研究了双原子N2分子和O2分子在激光场中的取向(alignment)行为,讨论了分子与飞秒(fs)激光脉冲作用后,在无外场情况下出现的周期性取向现象.计算结果表明,随着温度的升高,分子的最大取向程度不断地减小;在低温时,随温度减小较快,当温度升高时,最大取向程度随温度的变化比较缓慢.并通过计算角动量分布探讨了产生这种变化的原因.In terms of rigid rotor model, time-dependent Schrrdinger equation is solved by using the pseudospectral method, and the alignment behaviors of diatomic molecular N2 and O2 are studied in laser field. The evolution of the field-free rotational wave-packet of the molecules after the laser pulse is over has been discussed. The results show that the alignment parameter of the molecules depends on the temperature. Both N2 and O2 molecules are better aligned at lower temperature, whereas they are poorly aligned at higher temperature. The behavior can be attributed to the population of the angular moment in the rotational wave-packet of molecules at different temperatures.

关 键 词：激光场 分子取向 转动波包 

分 类 号：O613.61[理学—无机化学]