Advances in Chemical Physics (Wiley Series in Probability by Joshua Jortner, Raphael D. Levine, Stuart Alan Rice

By Joshua Jortner, Raphael D. Levine, Stuart Alan Rice

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The method was termed ELLIPSA (elliptical polarization state alteration)" and should prove to be of general applicability, being potentially quite sensitive. The fate of two-photon excited neutral molecules and atoms is most easily followed in real time by fluorescence monitoring. In the next sections we show that in spite of the small two-photon absorption crosssection, the method can be used for quantitative kinetic measurements. For some applications, it is more straightforward and leads to less ambiguous interpretation than one-photon excitation.

In general, the sodium concentration decreased after the laser pulse, and returned to equilibrium at a slower rate. However, the signals also contained a large sinusoidal modulation, which at high pressures completely obliterated the desired signal. When helium was added to the gas mixture, the sinusoidal frequency increased in accordance with the difference in the velocity of sound. This implies that the modulation is due to changes in the sodium density due to acoustic waves. This is a phenomenon commonly observed in laser-induced fluorescence when the gas.

IV. Discussion.. . . . . . . . . . . . . . . . . . . . . Acknowledgment. . . . . . . . . . . . . . . . . . . . . Referen~s. . . . . . . . . . . . . . . . . . . . . . . I. 54 54 I. INTRODUCTION The diffusion cloud (flame) technique developed by Hartel and Polanyi’, in the 1930s is one of the early methods of studying rapid bimolecular chemical reactions under pseudo-first-order, steady-state conditions.

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