Population and deactivation of lowest lying barium levels by collisions with He, Ar, Xe and Ba ground state atoms. Vadla, Č., Niemax, K., Horvatić, V., & Beuc, R. Zeitschrift f??r Physik D Atoms, Molecules and Clusters, 34(3):171-184, SPRINGER VERLAG, 1995.
abstract   bibtex   
Excitation transfer between the barium low lying excited states 6s6p 3 P 1 0 , 6s5d 1 D 2 and 6s5d 3 D J by collisions with He,Ar,Xe and Ba has been investigated. The population densities in all levels involved were probed by absorption or by fluorescence usingcw lasers. The depopulation cross sections of the Ba3 P 1 0 state by collisions with noble gases were found to be $σ$He(3 P 1 0 )=5.5·10−16 cm2, $σ$Ar(3 P 1 0 )=4.6·10−16 cm2, and $σ$Xe(3 P 1 0 )=1.7·10−16 cm2. For Ar, the collisional depopulation of the3 P 1 0 level is exclusively due to the transition to the1 D 2 state. Under the assumption that the3 D J metastable states are populated collisionally by1 D 2 →3 D J transfer only, we have deduced the upper limit for the corresponding cross section $σ$ 13 Ar =1.5·10−18 cm2. From the Ba1 D 2 and Ba3 D J steady-state diffusion distributions, collisional relaxation rates of the1 D 2 and3 D J levels were evaluated. The collisional relaxation rates by Ar and Ba yielded total cross sections for the depopulation of metastable levels: $σ$Ar(1 D 2)=1.5·10−17 cm2, $σ$Ba(1 D 2)℞1·10−13 cm2, $σ$Ar(3 D J)=7·10−21 cm2, and $σ$Ba(3 D J)=1·10−15 cm2. Furthermore, it was found that the main contribution of the collisional depopulation of the1 D 2 state by Ar is related to back transfer to the3 P J 0 state, whereas the deactivation of the3 D J metastable state is due to back transfer to the1 D 2 state. Taking into account other cross sections reported in literature we can conclude that collisional deactivation of both metastable levels by Ba ground state atoms can be attributed to their mutual collisional mixing.
@article{
 title = {Population and deactivation of lowest lying barium levels by collisions with He, Ar, Xe and Ba ground state atoms},
 type = {article},
 year = {1995},
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 pages = {171-184},
 volume = {34},
 publisher = {SPRINGER VERLAG},
 city = {175 FIFTH AVE, NEW YORK, NY 10010},
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 abstract = {Excitation transfer between the barium low lying excited states 6s6p 3 P 1 0 , 6s5d 1 D 2 and 6s5d 3 D J by collisions with He,Ar,Xe and Ba has been investigated. The population densities in all levels involved were probed by absorption or by fluorescence usingcw lasers. The depopulation cross sections of the Ba3 P 1 0 state by collisions with noble gases were found to be $σ$He(3 P 1 0 )=5.5·10−16 cm2, $σ$Ar(3 P 1 0 )=4.6·10−16 cm2, and $σ$Xe(3 P 1 0 )=1.7·10−16 cm2. For Ar, the collisional depopulation of the3 P 1 0 level is exclusively due to the transition to the1 D 2 state. Under the assumption that the3 D J metastable states are populated collisionally by1 D 2 →3 D J transfer only, we have deduced the upper limit for the corresponding cross section $σ$ 13 Ar =1.5·10−18 cm2. From the Ba1 D 2 and Ba3 D J steady-state diffusion distributions, collisional relaxation rates of the1 D 2 and3 D J levels were evaluated. The collisional relaxation rates by Ar and Ba yielded total cross sections for the depopulation of metastable levels: $σ$Ar(1 D 2)=1.5·10−17 cm2, $σ$Ba(1 D 2)℞1·10−13 cm2, $σ$Ar(3 D J)=7·10−21 cm2, and $σ$Ba(3 D J)=1·10−15 cm2. Furthermore, it was found that the main contribution of the collisional depopulation of the1 D 2 state by Ar is related to back transfer to the3 P J 0 state, whereas the deactivation of the3 D J metastable state is due to back transfer to the1 D 2 state. Taking into account other cross sections reported in literature we can conclude that collisional deactivation of both metastable levels by Ba ground state atoms can be attributed to their mutual collisional mixing.},
 bibtype = {article},
 author = {Vadla, Čedomil and Niemax, K and Horvatić, Vlasta and Beuc, R},
 journal = {Zeitschrift f??r Physik D Atoms, Molecules and Clusters},
 number = {3}
}
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