Laser-Induced Fluorescence Study on Reactions of C+(2P) and C(1D,1S) With Alcohols Leading to CH(X2Π) Radicals at Thermal Energy

Thermal energy reactions of C + ( 2 P) and C( 1 D, 1 S) with CH 3 OH, C 2 H 5 OH, n-C 3 H 7 OHand i-C 3 H 7 OH to give CH(X 2 Π) radicals have been investigated by observing laser-inducedfluorescence (LIF) spectra of CH(A—X) in a flowing afterglow. In the hydrideion abstraction by C + ( 2 P), only CH 3 OH exhibited the CH(A—X) LIF spectrum with avibrational distribution of 1.0 : 0.62 for v″ = 0 and 1, respectively. On the other hand,the CH(A—X) LIF spectra exclusively from v″ = 0 were observed in the reactions ofC( 1 D, 1 S) with all alcohols studied. By isotopic substitution for CH 3 OH it was shown thatthe CH(X) radicals arise from the selective attack on the methyl site in the reactions ofC + ( 2 P) and C( 1 D, 1 S) with methanol.