Infra-Red Spectrum of the Night Sky

Details Infra-Red Spectrum of the Night Sky Infra-Red Spectrum of the Night Sky

Jul 1945

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1945natur.156..114h&link_type=abstract

Nature, Volume 156, Issue 3952, pp. 114-115 (1945).

Physics

4

Scientific paper

WE photographed the infra-red spectrum of the night sky by means of a spectrograph with two prisms having an aperture of f/1.5, giving a dispersion of 2000 A./mm. near 8000 A. and of 3000 A./mm. near 10000 A. We used the only infra-red plates we had at our disposal, namely, ``800'' AGFA plates; we sensitized them before exposure. A ten-hour exposure made at the end of February 1942 at the Lyons Observatory gave us a spectrum1 showing: (1) A broad band without any visible structure, stretching from γ 7400 A. to about γ 8500 A., with a notable fall of intensity beyond γ 8200 A.; according to the earlier observations made by Cabannes2, it appears to be the first positive system of the nitrogen bands, the A oxygen band and the water-vapour bands. (2) A very broad band at about 0.97 µ and a line or band about 1.03 µ. Since the limit of sensitivity of the plates we used is normally about 0.85 µ, an image much beyond 0.9 µ is possible only if there is in the night sky an unusually intense emission in this spectral region.

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