Abstract
Van der Waals molecules are weakly bound complexes that serve well as prototype systems for vibrational dynamics and unimolecular decay studies. Vibrational predissociation has been examined in a number of van der Waals molecules.1-3 An interesting complex is the nitric oxide dimer. This is the only case of vibrational predissociation in a van der Waals complex for which there are complementary time-and frequency-domain measurements. Previous investigations of (NO)2 infrared photodissociation dynamics revealed a mode dependence of the NO product appearance rate when the v1 or v5 NO stretching modes were excited,4-8 The lifetime of the excited dimer was 880 ± 260 ps and 39 ± 8 ps after v1 (1868 cm−1·) and v5 (1789 cm−1) excitations, respectively. Based on these results one should anticipate dramatic effects to be observable lor excitations in the NO overtone regions around 3500-3800 cm−1.
© 1991 Optical Society of America
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