THE DISSOCIATIVE RECOMBINATION OF PROTONATED ACRYLONITRILE, CH{sub 2}CHCNH{sup +}, WITH IMPLICATIONS FOR THE NITRILE CHEMISTRY IN DARK MOLECULAR CLOUDS AND THE UPPER ATMOSPHERE OF TITAN

Journal Article · Fri Apr 10 04:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/695/1/317; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21296268

Vigren, E; Hamberg, M; Zhaunerchyk, V; Kaminska, M; Thomas, R D; Larsson, M; Geppert, W D ^[1]; Millar, T J

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1. Department of Physics, AlbaNova, Stockholm University, SE-10691 Stockholm (Sweden)

Measurements on the dissociative recombination (DR) of protonated acrylonitrile, CH{sub 2}CHCNH{sup +}, have been performed at the heavy ion storage ring CRYRING located in the Manne Siegbahn Laboratory in Stockholm, Sweden. It has been found that at {approx}2 meV relative kinetic energy about 50% of the DR events involve only ruptures of X-H bonds (where X = C or N) while the rest leads to the production of a pair of fragments each containing two heavy atoms (alongside H and/or H{sub 2}). The absolute DR cross section has been investigated for relative kinetic energies ranging from {approx}1 meV to 1 eV. The thermal rate coefficient has been determined to follow the expression k(T) = 1.78 x 10{sup -6} (T/300) {sup -} {sup 0.80} cm{sup 3} s{sup -1} for electron temperatures ranging from {approx}10 to 1000 K. Gas-phase models of the nitrile chemistry in the dark molecular cloud TMC-1 have been run and results are compared with observations. Also, implications of the present results for the nitrile chemistry of Titan's upper atmosphere are discussed.

• OSTI ID: 21296268
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 695; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
ACRYLONITRILE
CLOUDS
CROSS SECTIONS
ELECTRON TEMPERATURE
HEAVY IONS
HYDROGEN
KINETIC ENERGY
RECOMBINATION
RUPTURES