分子核间距对非时序双电离的影响  

Effect of molecular internuclear distance on non-sequential double ionization

作　　者：魏雅娜[1] 杨世平[1] 

机构地区：[1]河北师范大学物理科学与信息工程学院,石家庄050016

出　　处：《物理学报》2010年第10期7298-7305,共8页Acta Physica Sinica

基　　金：河北省自然科学基金(批准号:A2008000136)资助的课题~~

摘　　要：利用半经典再散射模型研究了激光强度在一定范围内时分子核间距对非时序双电离过程的影响.分别计算了非时序双电离率、两电子的电离能、两电子的动量相关、Coulomb和激光场的复合势随分子核间距的变化关系.研究表明,分子核间距在1.0—6.0a.u.范围内时,非时序双电离率和两电子动量和为零的双电离事件数随着分子核间距的增大而增大.当分子核间距继续增大(大于6.0a.u.)时,非时序双电离率和两电子动量和为零的双电离事件数却减小。Using the semiclassical rescattering model,we have studied the effect of molecular internuclear distance on nonsequential double ionization.In the process of our analysis,the non-sequential double ionization rate,two-electron ionization energy,two-electron momentum correlation and the combined potential of Coulomb field and laser field are calculated with the molecular internuclear distance changing.The results show that non-sequential double ionization rate and the double ionization events with the sum of the two electron momentums equal to zero increase with the molecular internuclear distance increasing when the molecular internuclear distance is within 1.0—6.0 a.u.When the molecular internuclear distance continues to increase（greater than 6.0 a.u.）,non-sequential double ionization rate and the double ionization events with sum of two electron momentums equal to zero decrease.

关 键 词：半经典再散射模型 MONTE Carlo法 分子核间距 

分 类 号：O562.4[理学—原子与分子物理]