A HARD SHAPE POTENTIAL MODEL FOR ATOM-SYMMETRICAL TOP INELASTIC CROSS-SECTIONS

被引:8
作者
BELCHIOR, JC [1 ]
MURRELL, JN [1 ]
BOSANAC, SD [1 ]
机构
[1] RUDJER BOSKOVIC INST, 41001 ZAGREB, CROATIA
关键词
D O I
10.1016/0301-0104(93)85013-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The quantum theory of hard shape collisions has been applied to atom-symmetric top collisions, with particular reference to He-NH3. The hard shape radius function has been expressed by an expansion in angular functions and key cross section ratios have been calculated as functions of the coefficients of the leading terms. A hard shape function for He-NH3 has been derived by optimising cross sections to previous calculations by Billing et al.; reported to be broadly in line with experimental measurements of relative cross sections by Schleipen et al. Energy and angular momentum propensity rules have been examined for the cross sections sigma11 --> j'k' and sigma41 --> j'k'. An exponential energy gap propensity rule is satisfactory but with different parameters for different \DELTAk\. However, the cross section sigma11 --> 44 is unexpectedly large; it appears that transitions are favored in which the magnitude of the total angular momentum is changed but not its direction.
引用
收藏
页码:155 / 164
页数:10
相关论文
共 17 条
[1]   THE HARDNESS FACTOR IN ROTATIONAL INELASTIC-SCATTERING [J].
BELCHIOR, JC ;
MURRELL, JN ;
BOSANAC, SD .
MOLECULAR PHYSICS, 1992, 77 (04) :727-733
[2]   RATE CONSTANTS FOR ROTATIONAL-EXCITATION OF ORTHO-NH3 AND PARA-NH3 COLLIDING WITH HE-4 ON AN AB-INITIO POTENTIAL-ENERGY SURFACE [J].
BILLING, GD ;
POULSEN, LL ;
DIERCKSEN, GHF .
CHEMICAL PHYSICS, 1985, 98 (03) :397-408
[3]   QUANTUM-THEORY OF IMPULSIVE COLLISIONS [J].
BOSANAC, SD ;
PETROVIC, N .
PHYSICAL REVIEW A, 1990, 41 (11) :5909-5915
[4]   HARD SHAPE POTENTIALS FROM ROTATIONAL STATE-TO-STATE INELASTIC CROSS-SECTIONS - A POSSIBLE ROUTE TO INVERSION [J].
BOSANAC, SD ;
MURRELL, JN .
JOURNAL OF CHEMICAL PHYSICS, 1991, 94 (02) :1167-1170
[5]  
Child M. S., 1974, MOL COLLISION THEORY
[6]   RATE CONSTANTS FOR ROTATIONAL EXCITATION IN NH3-HE COLLISIONS [J].
DAVIS, SL ;
BOGGS, JE .
JOURNAL OF CHEMICAL PHYSICS, 1978, 69 (06) :2355-2366
[7]  
Edmonds A. R., 1960, ANGULAR MOMENTUM QUA
[9]   ENERGY-TRANSFER IN NH3-HE COLLISIONS [J].
GREEN, S .
JOURNAL OF CHEMICAL PHYSICS, 1980, 73 (06) :2740-2750
[10]   ROTATIONAL EXCITATION OF SYMMETRIC TOP MOLECULES BY COLLISIONS WITH ATOMS .2. INFINITE-ORDER SUDDEN APPROXIMATION [J].
GREEN, S .
JOURNAL OF CHEMICAL PHYSICS, 1979, 70 (02) :816-829