Reactions of CH2((X)over-tilde(3)B(1)) and CH2((a)over-tilde (1)A (l)) with O-2 studied by time-resolved FTIR spectroscopy

Electronic state-specific CH2 reactions with O-2 in the gas phase were inve stigated by time-resolved Fourier transform infrared emission spectroscopy. CH2((X) over tilde(3)B(1)) and CH2((a) over tilde(1)A(1)) radicals were pr oduced by laser photolysis of ketene at 351 and 308 nm, respectively. Vibra tionally excited products of CO(nu less than or equal to 10), CO2(nu(3), v less than or equal to 7), H2CO(nu(1)) and H2O(nu(3)) formed in the CH2((X) over tilde(3)B(1)) + O-2 reaction and CO(v less than or equal to 10); CO2(n u(3), v less than or equal to 8), H2CO(nu(1)) formed in the CH2((a) over ti lde A(1)) + O-2 reaction have been observed. For each reaction, three possi ble channels have been verified, (C) 2000 Elsevier Science B.V. All rights reserved.