Collisional Energy Transfer from Vibrationally Excited Polyatomic Molecules |
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Authors: | G. A. Zalesskaya D. L. Yakovlev D. I. Baranovsky E. G. Sambor |
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Affiliation: | Institute of Molecular and Atomic Physics Academy of Sciences of Belarus , Minsk, Belarus , 220071 |
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Abstract: | Abstract Intensities and decay rates of delayed fluorescence initiated by CO2 laser excitation of the triplet-state molecules are used to probe collisional relaxation of vibrationally excited polyatomic molecules. Collisional efficiencies for large polyatomic molecules are found not to exceed the value of 10?2-10?3 even in most favourable case of vibrational energy exchange in collisions between parent molecules. At intermediate levels of excitation (1500—12000 cm?1) the average energies <ΔE> transferred per collision with polyatomic molecules increase as vib>rn, where m≥2, and decrease with increasing numbers of atoms in the excited molecules. |
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Keywords: | collisional energy transfer CO2 laser excitation delayed florescence |
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