THE RADIATIVE ASSOCIATION OF HE+ AND HE AND H+ AND H

被引：50

作者：

STANCIL, PC ^{[1
]}

BABB, JF ^{[1
]}

DALGARNO, A ^{[1
]}

机构：

[1] OLD DOMINION UNIV,DEPT PHYS,NORFOLK,VA 23529

来源：

ASTROPHYSICAL JOURNAL | 1993年 / 414卷 / 02期

关键词：

ISM; INDIVIDUAL; (NGC-7027); MOLECULAR PROCESSES; SUPERNOVAE; (SN-1987A);

D O I：

10.1086/173113

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The rate coefficient for the radiative association of He+ and He to form He-2+ is determined for temperatures T between 20 K and 500,000 K. It can be represented by the relation 1.3 x 10(-21) T-0.008 exp (- T/67) + 2.1 X 10(-24) T1.8 exp (- T/22,800) cm3 s-1 to within 25% applicable up to 50,000 K. It is about an order of magnitude less than the rate coefficient for the radiative association of H+ and H to form H-2+. Cross sections for the He-2+ and H-2+ reactions calculated using a fully quantum-mechanical method reveal weak resonance features at low energies. Implications of the He+ + He radiative association process are discussed briefly in connection with the chemistry of supernova ejecta, planetary nebulae, and the early universe.

引用

页码：672 / 675

页数：4

共 22 条

[1] ADIABATIC CALCULATIONS AND PROPERTIES OF THE HE-2(+) MOLECULAR ION [J].