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The temperature dependence of the cross section sigma-5S for the energy pooling process Na(3P) + Na(3P) -> Na(5S) + Na(3S)

Applying the method of laser induced fluorescence, the cross section s5S for the energy pooling process Na(3P) + Na(3P) -> Na(5S) + Na(3S) has been determined at temperatures in the interval from 567 K to 676 K. It has been found that sigma-5S decreases with increasing temperature, exhibiting sigma-5S ~ T^(-1.3) dependence. The obtained results show excellent agreement with the recent theoretical calculations. Also, the determined temperature dependence of the cross section sigma-5S fits very well into recently reported general sigma vs. T scheme for the endothermic collisional excitation energy transfer cross sections, which includes various collision partners and various types of collisional excitation energy transfer processes with different energy defects.

energy pooling process; Na(3P) + Na(3P) -> Na(5S) + Na(3S); laser induced fluorescence; collisional excitation energy transfer; cross section

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