Laser Spectroscopy by Boschke F.L.
By Boschke F.L.
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Example text
More detailed investigations of these excitation and deactivation processes were necessary in order to gain full understanding of the mechanisms involved. They have been performed by several authors with different methods (see Section V). The laser-excited fluorescence method is especially useful for exploring this field and it has been applied to a study of the V--, V energy transfer between N2 and CO2 149) and the deactivation of vibrationally excited CO2 in collisions with noble gases 148) or H20 and D20 149) Very large rate constants have been found for near resonant energy transfer between infrared active vibrations in CO: 150).
This Using this "optical Kerr cell" the authors developed a technique to measure the lifetimes of atomic and molecular transitions on a picosecond time scale 138a). See also the reviews by Rentzepis 138b) about "ultrafast processes" and Merkelo 138c). 26 Spectroscopic Investigations of Collision Processes single spike is emitted exactly at the time when threshold population is reached. Measurements of this time and the shape of the pump light pulse yield the fluorescence lifetime of the upper laser level.
Hocker et al. 150a) studied vibrational relaxation in CO2 by this technique. The effective lifetimes of all these excited states are determined by radiative as well as collisional deactivation, and which contribution is the more significant depends on pressure and transition probability. The simultaneous recording of the absorption and fluorescence spectra yields information about the ratio of radiative to collisioninduced nonradiative decays. This ratio is proportional to the quotient of total fluorescence from the excited level to total absorbed laser light.