The time-resolved infrared fluorescence ͑IRF͒ technique has been used to study the vibrational deactivation of excited N 2 O by large polyatomic colliders at ambient temperature ͑295Ϯ2 K͒. N 2 O͑00 0 1͒ molecules were prepared by direct pumping with the P͑18͒ line of a pulsed CO 2 laser at 9.536 m. The bimolecular rate constant for self-deactivation was determined to be ͑0.763Ϯ0.006͒ϫ10 3 Torr Ϫ1 s Ϫ1 , in very good agreement with previous work. The rate constants for deactivation by Ar and H 2 were found to be ͑0.103Ϯ0.003͒ and ͑4.89Ϯ0.52͒ϫ10 3 Torr Ϫ1 s Ϫ1 , respectively. The deactivation rate constants for the large polyatomic molecules, c-C
The time-resolved infrared fluorescence (IRF) technique has been used to study the vibrational deactivation of CO 2 (00 0 1) and N 2 O(00 0 1) by C 6 D 5 CH 3 and C 6 H 5 CD 3 at ambient temperature (295 ( 2 K). The bimolecular deactivation rate constants were found to be (242 ( 17) × 10 3 and (145 ( 5) × 10 3 Torr -1 s -1 , respectively, for the deactivation of CO 2 (00 0 1), and (253 ( 13) × 10 3 and (376 ( 20) × 10 3 Torr -1 s -1 , respectively, for the deactivation of N 2 O(00 0 1). Experimental deactivation probabilities are calculated and compared with our previous data for deactivation of the same two excited molecules by the colliders C 6
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