Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
96 (1992), S. 237-247
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Multiphoton ionization spectroscopy and time-of-flight mass spectrometry have been used to determine nascent photofragment energy distributions for several of the products of the 193 nm photolysis of nitromethane (CH3NO2). Internal energy distributions have been obtained for CH3 and NO(X 2Π), and translational energy distributions for CH3, NO(A 2Σ+), and O(3P). The production of two NO electronic states (X and A) and the appearance of two peaks in the translational energy distributions of the CH3 and O fragments are consistent with earlier proposals of a two-channel dissociation. The major channel produces CH3 and NO2(1 2B2), some of the latter having sufficient internal excitation to further dissociate to NO(X) and O. The minor channel is believed to produce NO2 in a different electronic state which subsequently absorbs a second 193 nm photon and dissociates to yield NO(A) and O. The major channel NO2 dissociation dynamics are fit well by an impulsive model, while the minor channel apparently partitions much of the available energy into NO(A) vibration and/or rotation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.462510
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