ISSN:
1434-6079
Keywords:
82.50.E
;
82.20.R
;
82.00
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The photodissociation of methylnitrite, CH3ONO, generates vibrationally, rotationally, and translationally excited NO and CH3O fragments. Following selective excitation via the localizedS 1(nπ*) ←S 0 transition into different overtones (v′=1, 2, 3) of theN=0 stretching modeν 3, the complete state distribution and the energy partitioning of the NO fragment was determined. For the CH3O fragment the complete energy, the translational energy and the sum of the rotational and vibrational energy was obtained. Owing to strong exit channel interactions between the initialν 3 mode and the translational and rotational motions, the fragment energy redistribution is highly selective with respect to the vibrational excitation and alignment of NO. Energywise the CH3O moiety behaves almost like a spectator. Furthermore the rotational alignment $$\overline {A_0^{(2)} } $$ of NO(v″) in the populated vibrational states (v″ = 0, 1, 2, 3) was measured as a function of the initial overtone excitation. In accord with theoretical predictions based on an ab initioS 1-potential surface, the highest geometrical selectivity of the dissociation process is obtained when the vibrational quantum numbersv′ ofν 3 andv″ of NO are the same. With increasing mismatch the deviation from a planar dissociation process is increasing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01436646
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