Reactions of the methylidine radical with CH_4_, C_2_H_2_, C_2_H_4_, C_2_H_6_, and but-1-ene studied between 23 and 295K with a CRESU apparatus.

Details Reactions of the methylidine radical with CH_4_, C_2_H_2_, C_2_H_4_, C_2_H_6_, and but-1-ene studied between 23 and 295K with a CRESU apparatus. Reactions of the methylidine radical with CH_4_, C_2_H_2_, C_2_H_4_, C_2_H_6_, and but-1-ene studied between 23 and 295K with a CRESU apparatus.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..644c&link_type=abstract

Astronomy and Astrophysics, v.323, p.644-651

Astronomy and Astrophysics

Astrophysics

41

Molecular Data, Molecular Processes, Methods: Laboratory, Ism: Molecules, Planets: Atmospheres, Rate Constant

Scientific paper

The temperature dependences of the reactions of the methylidine radical (CH) with several hydrocarbons were studied in the temperature range 23-295 K using the Rennes CRESU apparatus coupled with the pulsed laser photolysis (PLP), laser induced fluorescence (LIF) technique. All the reactions remain very fast at low temperature. For the reactions of CH with olefins, a maximum rate is obtained at about 70 K and then the rate coefficients slightly decrease at lower temperatures. A similar effect is observed in the data for CH+CH_4_ and CH+C_2_H_6_ with a maximum rate being obtained at about 40K. The results are compared with previous studies where available, and the nature of the possible products is also discussed, although this study does not enable their detection. Consequences of these new results for the chemistry of planetary atmospheres and interstellar clouds are stressed.

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