A Caltech Library Service

An Analysis of the Spectrum of Mars

Kaplan, Lewis D. and Münch, Guido and Spinrad, Hyron (1964) An Analysis of the Spectrum of Mars. Astrophysical Journal, 139 (1). pp. 1-15. ISSN 0004-637X. doi:10.1086/147736.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


On a high-dispersion spectrogram of Mars taken at Mount Wilson rotational lines of H_2O near λ 8300 and CO_2 near λ 8700 have been detected. Recent laboratory measurements of line strengths by D. Rank have been used to determine the amounts of H_2O and CO_2 in the atmosphere of Mars: 14 ± 7 μ precipitable water and 55 ± 20 m atm CO_2. From the absence of O_2 in the Martian spectra, we set an upper limit of 70 cm atm for the O_2 content. By suitably combining the CO_2 amount with observations by Kuiper and Sinton of the strongly saturated bands in the 2-μ. region, a surface pressure of 25 ± 15 mb has been derived. The implications of the results on the composition of the Martian atmosphere are discussed.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1964 American Astronomical Society. Received November 11, 1963. It is a pleasure to express our thanks to Professor D. Rank for providing us with unpublished laboratory data, to Professor W. S. Benedict for discussions on the H_2O spectrum, and to Professor G. P. Kuiper for sending us his observations in advance of publication.
Issue or Number:1
Record Number:CaltechAUTHORS:20150811-124650209
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59418
Deposited By: George Porter
Deposited On:11 Aug 2015 20:56
Last Modified:10 Nov 2021 22:20

Repository Staff Only: item control page