期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 201, 期 1-3, 页码 135-142出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1387-3806(00)00212-8
关键词
radiative electron attachment; carbon cluster anion; interstellar clouds
Recent spectroscopic studies of carbon chain anions in the gas phase, and more specifically of C-7(-) have brought insight into the long-standing mystery of the unexplained diffuse interstellar bands. Previously, negative ions had not been considered highly abundant in interstellar clouds, and the question of efficient mechanisms leading to their formation had not been investigated in great detail. This work presents a statistical calculation of the rate coefficients for radiative attachment of an electron to small linear carbon clusters containing 4-9 atoms. We conclude that for molecules with 6 or more C atoms, the attachment occurs on every collision at the low temperatures of diffuse interstellar clouds. (C) 2000 Elsevier Science B.V.
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