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| Keywords: SpectroscopyResearch 021.jpg Because the distance of Mars was decreasing at the time there is a Doppler shift in the Martian spectrum towards the shorter wavelengths However this only affects lines originating on Mars or present in the original sunlight that Mars reflects The Doppler shift is clearly eviden at places marked by arrows In the case of the strong absorption line at 7187 38 A which is a blend of a solar iron line and a terrestrial water-vapor line the shift is sufficient for the iron line to form a new blend with the H2 line at 7187 01 A and thereby alter the relative strengths of the lines compare adjacent spectrum of the moon If oxygen or water-vapor lines were present in these Martian spectra they ought to appear as faint companions to the corresponding lines produced by the earth's atmosphere but no such companion lines are to be seen National Institute of Standards and Technology 1956-07-21 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy | ||||
