Venera 11 and 12 mass spectrometry of the lower Venus atmosphere

Details Venera 11 and 12 mass spectrometry of the lower Venus atmosphere Venera 11 and 12 mass spectrometry of the lower Venus atmosphere

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sval....5..113i&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 5, May 1979, p. 211-216.) Soviet Astronomy Letters, vol. 5, May-June 1979, p. 113-115.

Astronomy and Astrophysics

Astronomy

2

Atmospheric Composition, Lower Atmosphere, Mass Spectroscopy, Venera Satellites, Venus Atmosphere, Abundance, Argon Isotopes, Krypton, Neon

Scientific paper

Atmospheric composition measurements were made with the Venera 11 and Venera 12 descent-probe mass spectrometers in December 1978. The Venus atmosphere contains abundant nitrogen (about 4.5% by volume). Argon isotopes (36, 38, 40 amu mass peaks), neon (20 amu), and krypton (84 amu) also occur. The argon isotopes have a total abundance of approximately 150 ppm; the Ne-20, about 10 ppm; and the Kr-84, approximately 0.5 ppm. The Ar isotopic composition is highly anomalous compared with the terrestrial atmosphere; radiogenic Ar-40 is as abundant as the 'primary' Ar-36 and Ar-38 isotopes combined.

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