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| - Collisional Properties of the OH Molecule
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| - The disposition of the rovibrational levels in a diatomic molecule has a major influence on the outcome ofinelastic collisions involving that molecule. In the case of the hydrides of moderately heavy elements, unusualcollisional properties are anticipated in view of conflict between the demands of momentum and energy inthese species. This arises because hydride rotational and vibrational quanta are generally large yet the speciesmay be quite heavy and thus carry substantial momentum. This leads to competition between the momentumbased mechanism for inelastic transfer and constraints which result from energy conservation. We illustratethese principles in investigating rotational, vibration−rotation, and quasiresonant vibration−rotation transfer,as well as vibrational predissociation of OH-containing van der Waals molecules. Collisional transfer is (almost)invariably constrained by energy conservation in this species and the impact of this on the linear-to-angularmomentum mechanism is strongly evident in the collisional behavior of the OH molecule. Molecular collisionpartners may accept vibrational energy from OH without generating angular momentum, resulting in moreefficient deactivation of vibrationally excited OH. Recent observation of emission from very high N levels of(X)2ΠOH in the nightglow appears to represent only the second recorded example of quasiresonant vibration−rotation transfer.
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