The technique of laser flash photolysis/laser absorption has been used to obtain absolute removal rate constants for singlet methylene, 1 CH 2 (a ˜1A 1 ), in the temperature range 298-462 K. The temperature dependences of the removal rate constants for N 2 , CH 4 , C 2 H 4 , C 2 H 6 , H 2 O, H 2 CO, CH 2 CO, CH 3 F, C 2 F 6 , and CH 3 OH were measured and the Arrhenius parameters determined. For the reacting species, CH 4 , C 2 H 4 , C 2 H 6 , H 2 O, H 2 CO, CH 2 CO, CH 3 F, and CH 3 OH, the rate constants exhibit negative temperature dependences with activation energies covering the range -0.7 ( 0.7 kJ mol -1 for CH 3 F to -3.5 ( 1.0 kJ mol -1 for CH 3 OH. In contrast, positive temperature dependences are observed for the nonreacting species, N 2 and C 2 F 6 , with activation energies of 1.8 ( 0.9 and 1.6 ( 2.0 kJ mol -1 , respectively. Good agreement was obtained with previously reported measurements for the N 2 , CH 4 , CH 2 CO, C 2 H 4 , and C 2 H 6 temperature dependences. For the nonreacting species, comparison is made with theoretical predicted temperature dependences for collision-induced intersystem crossing from 1 CH 2 (a ˜1A 1 ) to 3 CH 2 (X ˜3B 1 ).
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