Chemistry of O(1D) atoms in the coma: implications for cometary missions

Bhardwaj, Anil ; Haider, S. A. (2002) Chemistry of O(1D) atoms in the coma: implications for cometary missions Advances in Space Research, 29 (5). pp. 745-750. ISSN 0273-1177

Full text not available from this repository.

Official URL:

Related URL:


The forbidden red oxygen lines at 6300 and 6364 Å, which results due to 1D→3P transition, provide an important diagnostic tool in the study of comets. These lines cannot be produced by resonance fluorescence excitation of the ground-state oxygen atom, and therefore are mainly produced due to dissociation of H2O and other O-containing species in comets (e.g., OH, CO, CO2, H2CO etc.) by photon and electron impact and in other collision reactions. Since the lifetime of 1D state is quite long (~110 sec) collisional de-excitation processes are important. We have used a coupled chemistry-transport model in conjunction with an efficient emission production code to study the chemistry of O(1D) atoms and the production of OI 6300 Å emission in comets. The model calculations are made for comet 46P/Wirtanen: the target of the ROSETTA mission. It is found that in the inner coma the density profile of O(1D) is controlled dominantly by the H2O. The model predicts ~300 R of OI 6300 Å brightness on comet Wirtanen.

Item Type:Article
Source:Copyright of this article belongs to Committee on Space Research.
ID Code:2410
Deposited On:07 Oct 2010 10:43
Last Modified:17 May 2011 06:21

Repository Staff Only: item control page