Laser Optics of Condensed Matter by V. M. Tuchkevich, Joseph L. Birman (auth.), Joseph L.

By V. M. Tuchkevich, Joseph L. Birman (auth.), Joseph L. Birman, Herman Z. Cummins, A. A. Kaplyanskii (eds.)

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There is an evident turnover regime in the rate versus collision frequency. The conventional gas phase kinetics (Lindeman-Hinshelwood theory) explains quite well the form of the initial rise in rate. The turnover occurs at a collision frequency of 6 x 10 12 S-1. The inertial regime approaching the maximum rate of isomerization, does not exhibit smooth variations of rate vs. collision frequency, suggesting that more molecular detail of the solvent-solute structure is needed to explain the behavior.

In some experiments additional illumination by Nd: YAG laser second harmonic pulses with peak intensity 10 was used (Fig. 7). In the BP method the SD efficiency ~ was measured as a function of the frequency detuning ~ = w - w (Fig. 8). 5 (exciton line); 614; 609 nm (interband transitions) - was varied. The orthogonal pump wave ~ytarizations were chosen to eliminate scattering from acoustic gratings • 33 Fig. 3. SS, PP method. ), ~2 &T .... 5 o. 4. 34 SS, PP methods. )' ~2 4. The analysis of the experimental results obtained enables one to draw the following conclusions.

9), we obtain dT c C dt = n·Jdyn 2 A = Ci? (flw) Tc 3/2 Jst Jdyn = 1 +A nh w (1'1 -) 3/2 Ron ( C Tc 2 A nTa hW l+A (11) Ta 1'lw ) eXP(-T) Tqhmin c where C is the plasma heat capacity. One can see that for A » 1 (if, however, the concentration is sufficiently large for the condition Tqcmin < Ta to be satisfied) the dynamical cooling rate in much less than the static one. The value Jdyn (for A » 1) is practically concentration independent, just as for small n, but rrruch lower. Such behavior was observed in a number of experiments.

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