MULTIPLE ACTIVATION-ENERGIES FOR CONVERSION OF HE(2S-3) ATOMS TO HE2(A-SIGMA-3(U+) MOLECULES IN TERNARY COLLISIONS

被引：18

作者：

KOYMEN, A ^{[1
]}

TANG, FC ^{[1
]}

ZHAO, X ^{[1
]}

DUNNING, FB ^{[1
]}

WALTERS, GK ^{[1
]}

机构：

[1] RICE UNIV,RICE QUANTUM INST,HOUSTON,TX 77251

来源：

CHEMICAL PHYSICS LETTERS | 1990年 / 168卷 / 05期

关键词：

D O I：

10.1016/0009-2614(90)85136-Z

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 temperature dependence for conversion of He(2 3S) metastable atoms to He2(a 3Σu+) metastable molecules in the three-body reaction He(2 3S) + 2He(1 1S) → He2(a 3Σu+) + He(1 1S) has been investigated over the temperature range 65-700 K. This reaction is thermally activated due to a long range repulsive barrier in the He(2 2S)-He(1 1S) interaction potential. Analysis of the data obtained at higher temperatures yields an activation energy E0 of ≈ 60 meV, comparable to the known He(2 3S)-He(2 1S) repulsive barrier height. At lower temperatures, however, the activation energy inferred from the data is much smaller, suggesting that for certain reaction geometries the barrier can be significantly lowered by the presence of the third body. © 1990.

引用

页码：405 / 409

页数：5

共 15 条

[1] LONG-RANGE HELIUM EXCIMER POTENTIALS (A,C-1SIGMA+U,G AND A,C3SIGMA+U,G) FROM HIGH-RESOLUTION DIFFERENTIAL CROSS-SECTIONS FOR HE(21S,23S)+HE [J].