Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 6: Dissociation and other Collision Processes

MO 6.5: Vortrag

Dienstag, 3. April 2001, 17:00–17:15, H1058

Resonant Selective Fragmentation of Organic Molecules by IR Laser Radiation — •Hartmut Jungclas¹, Lothar Schmidt¹, Viacheslav Komarov², Anna Popova², Igor Stureiko², and Yulia Trondina² — ¹Univ. Marburg, FB Chemie, 35032 Marburg — ²Univ. Moscow, Nuclear Physics, Moscow 119899

In the present report the application of the excimol theory [1] to the photo fragmentation of organic molecules containing chain-like substructures of identical diatomic dipole groups was analysed. It was shown that collective vibrational excitation (excimol) can be produced by an IR laser field in such substructures, if the frequency of the laser radiation coincides with the frequency of the excimol. The maximum of the fragmentation probability function on the frequency scale depends on the structure of the chain, on the dipole-dipole interaction of the diatomic groups in the chain and on the excimol life time. The experiments on the fragmentation of some organic molecules by CO2-laser radiation were analysed and the quantitative agreement with our model was achieved. We conclude, that one can realise a selective photo fragmentation of polyatomic molecules with chain-like substructures by a proper choice of the IR laser frequency and fluence.

[1] V.V. Komarov, A.M. Popova, L. Schmidt, H. Jungclas, Mol. Phys. 91, 139 (1997)