Vibrational relaxation of the N2O ν1 mode by Ar, N2, H2O, and NO

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Abstract
The vibrational relaxation of the N2O ν1 symmetric stretch mode and the ν2 bending mode due to collisions with Ar, N2, and H2O were studied at room temperature using a laser fluorescence technique. The V–V equilibration time constants between the ν1 and ν2 modes were measured to be 0.38, 0.26, and 3.0×10−3 μsec⋅atm with Ar, N2, and H2O, respectively, as the collision partner. The ν2 V–T relaxation time constants of 12.1, 1.75, and 9.4×10−3 μsec⋅atm were measured, respectively, for collisions with Ar, N2, and H2O. In both relaxation processes H2O was found to be an extremely efficient relaxer. The effects of N2O–NO collisions were studied. The result suggested a fast V–V equilibration possibly due to the near resonance between the (11 1O) level of N2O and the first excited vibrational level of NO.

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