engleski

Collision cross sections for excitation energy transfer in Na* (3P 1/2)+K(4S 1/2)⇔Na*(3P 3/2)+K(4S 1/2) processes

The cross sections for the excitation energy transfer between the 3 2PJ states of sodium atoms by collisions with ground-state potassium atoms have been measured by resonant Doppler-free two-photon spectroscopy, where the population densities of directly pumped and collisionally excited Na(3PJ) (J=1/2, 3/2) levels were probed by counter- propagating Na(3PJ)->Na(4D3/2, 5/2) excitation and detected with the thermionic diode. Cross sections of sigma(3P1/2/>3P3/2)=190 Å ; 2± ; 20% and sigma(3P3/2/>3P1/2)=100 Å ; 2± ; 20% were found. The theoretical calculations taking into account the long- range interaction terms R– 6, R– 8 and R– 10 yield a value sigma(3P1/2/>3P3/2)=165 Å ; 2. On the basis of these long- range interaction potentials the differential cross section has been calculated and compared with recently published experimental data. Very good agreement between the theoretical and experimental data was found.

excitation transfer ; sodium ; potassium

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