Detection of OH Rotational Emission from Comet p/ Halley in the Far Infrared

Details Detection of OH Rotational Emission from Comet p/ Halley in the Far Infrared Detection of OH Rotational Emission from Comet p/ Halley in the Far Infrared

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..451s&link_type=abstract

Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 451, 1987

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

The authors detected the 2Π3/2 (J = 5/2→3/2; +→- parity) transition of OH in comet Halley at 119.44 μm and placed an upper limit of the line intensity of the -→+ parity transition at 119.23 μm. The ratio of these lines is consistent with radiative pumping and inconsistent with photochemical pumping of the OH rotational levels. These far-infrared lines probe the inner regions of the comet coma where OH is produced through photodissociation of a parent (presumably H2O) molecule. Hence, these lines complement the 18 cm radio measurements which are sensitive to the outer regions of the comet coma. The OH production rate on May 3, 1986 was ≡3.6×1029molecules s-1.

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