Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..651m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, May 1984, p. 651-654.
Physics
31
Electron-Ion Recombination, Hydrogen Ions, Positive Ions, Recombination Coefficient, Electron Energy, Interstellar Matter, Mass Spectroscopy, Microwave Spectrometers, Planetary Atmospheres
Scientific paper
A microwave afterglow-mass spectrometer apparatus is used to determine the dissociative recombination coefficients for capture of electrons by H3(+) and H5(+) ions as a function of electron temperature. At an ion and neutral temperature of 240 K, the coefficient for H3(+) is found to vary slowly with the electron temperature at first, decreasing from 1.6 x 10 to the -7th cu cm/s at an electron temperature of 240 K to 1.2 x 10 to the -7th cu cm/s at an electron temperature of 500 K; at electron temperatures ranging from 500 to 3000 K, the coefficient falls as the reciprocal of the electron temperature. It is noted that the results, which have an uncertainty of + or - 20 percent, agree satisfactorily over the common energy range (0.03-0.36 eV) with the recombination cross sections determined in merged beam measurements by Auerbach et al. (1977). Attention is also given to the implication of the results for modeling planetary atmospheres and interstellar clouds.
Biondi Manfred A.
Johnsen Rainer
MacDonald Angela J.
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