Accession Number:

AD0291785

Title:

HELIUM IONS IN THE UPPER ATMOSPHERE

Descriptive Note:

Corporate Author:

QUEEN'S UNIV BELFAST (NORTHERN IRELAND)

Personal Author(s):

Report Date:

1962-01-01

Pagination or Media Count:

1.0

Abstract:

Reasons are given for believing that ion-atom interchange between He and N2 i strongly endothermic but that ion-atom interchange between H Eand O2 is exothermic. It is concluded that the former ion-atom interchange proce s does not occur to an appreciable extent but that the latter may be responsible for the re oval of the He being produced by photoionization. Calculations are carried out on the steady state. In harmony with the prediction of Nicolet He is found to be abundant at great altitudes even if a high rate coefficient is assigned to the collision process leading to its removal. Attention is drawn to the possibility that dissociative recombination f HeO is important in connection with the problem of the escape of helium into interplanetary space. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE