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FIZIKA A 4 (1995) 3, 463-472
 
THE 6s5d 1D2®
6s5d 3DJ EXCITATION ENERGY TRANSFER IN BARIUM INDUCED BY
COLLISIONS WITH He, Ar AND Xe ATOMS
ČEDOMIL VADLA and VLASTA HORVATIĆ
Institute of Physics of the University, Bijenička 46, 10000 Zagreb, Croatia
Dedicated to Professor Mladen Paić on the occasion of his 90th
birthday
Received 26 June 1995
Revised manuscript received 7 September 1995
The cross sections for the Ba 6s5d 1D2® 6s5d 3DJ excitation energy
transfer, induced by collisions with He, Ar and Xe, were measured using laser absorption
and fluorescence methods in the steady-state regime. The populations of the barium
metastable 6s5d 1D2 and Ba 6s5d 3DJ states
were created by subsequent radiative and collisional relaxation of the optically excited
6s6p 3P10 level. The four-level model, comprising 6s2
1S0, 6s6p 3P10, 6s5d 1D2
and 6s5d 3DJ states, is proposed for the description of the
population and depopulation processes of the Ba metastable states in noble gas atmosphere.
The analysis of the experimental results, within the assumed model, yields the following
cross-section values for the investigated processes: sHe
= 1.5×10-20 m2, sAr = 2×10-22
m2 and sXe = 8×10-21 m2,
with an accuracy of ±50%.
UDC 539.186
PACS 34.50.-s, 32.80.-t
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