Add time:08/01/2019         Source:sciencedirect.com

A comparison between theory and experiment, concerning the K(4 s) + K(7s)→K(4 s) + K(5f) reaction of excitation energy transfer in thermal collisions, is presented. The cross sections for this process are calculated for the potassium vapour temperatures in the range of 310–1000 K. The calculations are based on the theoretical adiabatic K2 potential energy curves and on the use of the multicrossing Landau-Zener model. The experiment was carried out using the method of spectroscopy with resolution in time. The signals of the direct-fluorescence decay from pulsed-laser-excited 7s state, and of the sensitized-fluorescence from 5f state, were registered and analysed. In the temperature range of the experiment, of 428–451 K, the calculated cross sections vary little, from 1.994 × 10−14 cm2 to 1.992 × 10−14 cm2, and agree well with the value 1.8(7)×10−14 cm2, which is the average of the corresponding experimental cross section results.

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