The contribution of electron collisions to rotational excitations of cometary water

Details The contribution of electron collisions to rotational excitations of cometary water The contribution of electron collisions to rotational excitations of cometary water

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..667x&link_type=abstract

In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 667-670 (SEE N93-19113 06-90)

Physics

Cometary Atmospheres, Electron Energy, Electron Scattering, Excitation, Halley'S Comet, Collision Rates, Giotto Mission, Infrared Spectra, Water

Scientific paper

The e-H2O collisional rate for exciting rotational transitions in cometary water is evaluated for conditions found in comet Halley during the Giotto spacecraft encounter. In the case of the O00 yields 111 rotational transition, the e-H2O collisional rate exceeds that for excitation by neutral-neutral collisions at distances exceeding 3000 km from the cometary nucleus. Thus, the rotational temperature of the water molecule in the intermediate coma may be controlled by collisions with electrons rather than with neutral collisions, and the rotational temperature retrieved from high resolution infrared spectra of water in comet Halley may reflect electron temperatures rather than neutral gas temperature in the intermediate coma.

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