ISSN:
1434-6079
Keywords:
34.50
;
32.00
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01437685
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