Collisional charging of interstellar grains

Details Collisional charging of interstellar grains Collisional charging of interstellar grains

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..803d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 803-817.

Mathematics

Probability

202

Charged Particles, Interstellar Matter, Particle Collisions, Charging, Cooling, Electron-Ion Recombination, Grain Size

Scientific paper

Collisional charging of small interstellar particles is reexamined, including effects due to electrostatic polarization of grains by the electric fields of approaching charged particles. The interaction potentials and resulting energy-dependent collisional cross sections are discussed and used to obtain the collisional charging rate for grains of specified charges in a thermal plasma. The probability distribution of the grain charges is obtained, and the application of the results to the interstellar medium is illustrated by considering the power-law grain size distribution of Mathis, Rumpl, and Nordsieck (1977). It is found that dust grains with such a size distribution can contribute appreciably to the recombination of metal ions in dark clouds.

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