State-resolved collisional quenching of highly vibrationally excited pyridine by water: The role of strong electrostatic attraction in V→RT energy transfer
| Autor: | Michael S. Elioff, Margaret Fraelich, Rebecca L. Sansom, Amy S. Mullin |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 111:3517-3525 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.479635 |
| Popis: | We report experiments that investigate the influence of long-range attractive forces on collisional energy loss from highly vibrationally excited molecules. State-resolved studies of energy transfer from highly vibrationally excited pyridine (μ=2.2 D) to water (μ=1.8 D) in a low-pressure environment at 298 K have been performed using high-resolution transient absorption spectroscopy of water at λ≈2.7 μm. Pyridine in its ground electronic state with 37 900 cm−1 of vibrational energy was prepared by absorption of pulsed ultraviolet light (λ=266 nm) to the S1 state, followed by rapid internal conversion to the S0 state. Collisions between vibrationally excited pyridine and water that result in rotational and translational excitation of the ground vibrationless state of H2O (000) were investigated by monitoring the populations of individual rotational states of H2O (000) at short times following pyridine excitation. The infrared probe of water was the highly allowed asymmetric stretching (000→001) transition.... |
| Databáze: | OpenAIRE |
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