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 |
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Authors: | V Horvatic D Veza M Movre K Niemax C Vadla |
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Institution: | 1. Institute of Physics of the University, Bijenicka 46, 10000, Zagreb, Croatia 2. Institut für Physik, Universit?t Hohenheim, Garbenstrasse 30, D-70599, Stuttgart, Germany
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Abstract: | The cross sections for the excitation energy transfer between the 32 P J 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(3P J )(J=1/2, 3/2) levels were probed by counter-propagating Na(3P J ) → Na(4D 3/2, 5/2) excitation and detected with the thermionic diode. Cross sections of σ(3P 1/2 → 3P 3/2)=190 Å2±20% and σ(3P 3/2 → 3P 1/2)=100 Å2±20% were found. The theoretical calculations taking into account the long-range interaction termsR ?6,R ?8 andR ?10 yield a value σ(3P 1/2 → 3P 3/2)=165 Å2. 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. |
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