Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...703.1179c&link_type=abstract
The Astrophysical Journal, Volume 703, Issue 2, pp. 1179-1187 (2009).
Astronomy and Astrophysics
Astronomy
3
Astrochemistry, Ism: Abundances, Ism: Molecules, Molecular Processes
Scientific paper
The C + C2H2 reaction is a key process in interstellar cloud chemistry. In a crossed-beam scattering experiment approaching the low-collision energies that characterize these environments, we determined relative differential cross sections by detecting the H-atom product. High-level ab initio calculations of the reaction energies of two competing pathways, leading to cyclic and linear C3H, were also performed. Both channels are clearly distinguishable: the integral cross section of the c-C3H + H channel monotonically decreases with increasing relative translational energy whilst the l-C3H + H channel exhibits a translational energy threshold. Moreover, a comparison of the H-atom yields from the C + C2H2 and C + C2H4 reactions shows that the C3 + H2 nonadiabatic channel dominates. These results are consistent with the calculated enthalpies and corroborate earlier low-temperature kinetic experiments. Branching ratios of the three reaction pathways are given in the T = 15-300 K temperature domain for inclusion in astrochemical databases.
Costes Michel
Daugey Nicolas
Halvick Philippe
Hickson Kevin M.
Naulin Christian
No associations
LandOfFree
Non-threshold, Threshold, and Nonadiabatic Behavior of the Key Interstellar C + C2H2 Reaction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Non-threshold, Threshold, and Nonadiabatic Behavior of the Key Interstellar C + C2H2 Reaction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-threshold, Threshold, and Nonadiabatic Behavior of the Key Interstellar C + C2H2 Reaction will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-805213