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Investigation of the dissociation of CH3CN and CH3NO2 molecules in an infrared field by laser-induced fluorescence
V. N. Lokhman, N. V. Chekalin, A. N. Shibanov
Abstract:
An investigation was made of the dissociation of CH3CN (excitation of the ν4 and ν7 vibration modes) and CH3NO2 molecules (excitation of the ν7 vibration mode) accompanied by the formation of CN(X2Σ+) radicals in the field of a high-power CO2 laser pulse. An investigation of the formation kinetics of CN radicals by laser-induced fluorescence showed that CN(X2Σ+) are the primary dissociation products of the CH3CN molecule. Collisionless dissociation of CH3CN during the excitation of the ν7 vibration mode is governed by the laser pulse power and not by its energy, the power threshold being 1.1–1.2 GW/cm2. At subthreshold infrared field powers, CN(X2Σ+) radicals can be formed as a result of the collisional mechanism of overcoming the anharmonicity in the lower vibrational levels. Laserinduced fluorescence may be used successfully to determine the lifetimes of the CN radicals in the systems under study. Different mechanisms for molecular dissociation in an infrared field and their relationship with the molecular parameters are discussed.
Received: 04.01.1979
Citation:
V. N. Lokhman, N. V. Chekalin, A. N. Shibanov, “Investigation of the dissociation of CH3CN and CH3NO2 molecules in an infrared field by laser-induced fluorescence”, Kvantovaya Elektronika, 6:9 (1979), 1911–1920 [Sov J Quantum Electron, 9:9 (1979), 1128–1133]
Linking options:
https://www.mathnet.ru/eng/qe9437 https://www.mathnet.ru/eng/qe/v6/i9/p1911
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