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Vector Correlations and Product Rotational Alignments of Reactions Ca+RBr→CaBr+R (R=CH3, C2H5 and n-C3H7)
Jian-jun Ma ,Shu-lin Cong*,Zhi-hong Zhang ,Yan-qiu Wang*
Author NameAffiliationE-mail
Jian-jun Ma Department of Physics, Dalian University of Technology, Dalian 116024, China  
Shu-lin Cong* Department of Physics, Dalian University of Technology, Dalian 116024, China shlcong@dlut.edu.cn  
Zhi-hong Zhang Department of Physics, Dalian University of Technology, Dalian 116024, China  
Yan-qiu Wang* Department of Physics, Dalian University of Technology, Dalian 116024, China dswang_ cn@yahoo.com.cn  
Abstract:
The quasiclassical trajectory method is used to study the vector correlations of the reactions Ca+RBr (R=CH3, C2H5 and n-C3H7Br) and the rotational alignment of product CaBr. The product rotational alignment parameters at di?erent collision energies and the vector correlations between the reagent and product are numerically calculated. The vector correlations are described by using the angle distribution functions P(θr),P(φr), P(θr, φr) and the polarization-dependent differential cross sections (PDDCSs). The peak values of P(θr) of the product CaBr from Ca+CH3Br are larger than those from Ca+C2H5Br and Ca+n-C3H7Br. The peak of P(θr) atφr = 3π/2 is apparently stronger than that at φr= π/2 for the three reactions Ca+RBr. The calculation results show that the rotational angular momentum of the product CaBr is not only aligned, but also oriented along the direction which is perpendicular to the scattering plane.The product CaBr molecules are strongly scattered forward. The orientation and alignment of the product angular momentum will affect the scattering direction of the product molecules to varying degrees.
Key words:  Quasiclassical trajectory, Vector correlation, Orientation and alignment
FundProject:
Ca+RBr→CaBr+R(R=CH3,C2H5,n-C3H7)反应的矢量相关和产物的转动取向
马建军,丛书林*,张志红,王艳秋*
摘要:
采用准经典轨线方法研究了碰撞反应Ca+RBr(R=CH3,C2H5和n-C3H7)的矢量相关性质和产物CaBr分子的转动取向.计算了不同碰量相关撞能情况下产物分子的转动取向参数和反应物与产物之间的矢分布几率函数矢量相关由角分布函数P(θr)!P(φr)和P(θr,φr)以及极化相关微分截面来描述.Ca+CH3Br反应产物CaBr的P(θr)峰值大于Ca+C2H5Br和Ca+n-C3H7Br反应产物CaBr的P(θr)峰值.对于反应Ca+RBr的P(θr)在φr=3π/2处的峰值明显大于φr=π/2处的峰值
关键词:  准经典轨线  矢量相关  定向和取向
DOI:10.1360/cjcp2006.19(2).117.6
分类号: