TENTATIVE IDENTIFICATION OF FORMALDEHYDE IN THE MARTIAN ATMOSPHERE

Citation
Oi. Korablev et al., TENTATIVE IDENTIFICATION OF FORMALDEHYDE IN THE MARTIAN ATMOSPHERE, Planetary and space science, 41(6), 1993, pp. 441-451
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
ISSN journal
0032-0633
Volume
41
Issue
6
Year of publication
1993
Pages
441 - 451
Database
ISI
SICI code
0032-0633(1993)41:6<441:TIOFIT>2.0.ZU;2-W
Abstract
Solar occultation observations of the Martian atmosphere near the limb of the planet were performed during the Phobos mission by means of th e Auguste infrared spectrometer in the ranges 2707-2740 and 5392-5272 cm-1 with a resolving power of almost-equal-to 1300. The spectra exhib it features at 2710 and 2730 cm-1 which have not been identified previ ously. After applying a set of corrections to the data and examining t he spectra of various molecules, we are led to conclude that the best candidate for the above-mentioned features is formaldehyde (CH2O). It was observed in eight of the nine successful occultation sequences, ma inly between 8 and 20 km with an average mixing ratio of 0.5(-0.3)+0.8 ppm (there are no good data below 8 km). The observations are perform ed in equatorial spring conditions. The altitude distribution of forma ldehyde reveals correlation with the permanent haze opacity.