Mixing and quenching of the Cs 5DJ states induced by collisions with caesium ground-state atoms (CROSBI ID 80966)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Movre, Mladen ; Vadla, Čedomil ; Horvatić, Vlasta
engleski
Mixing and quenching of the Cs 5DJ states induced by collisions with caesium ground-state atoms
Applying cw laser absorption and fluorescence method the cross sections for the fine-structure mixing and quenching of the caesium 5DJ states have been measured in pure caesium vapour. Caesium atoms were optically excited to the 5D5/2 state via quadrupole-allowed 6S1/2 -> 5D5/2 transition. The ground-state caesium density No, obtained from the absorption at the pumped quadrupole transition and the fluorescence intensity I689 of the sensitised 5D3/2 -> 6S1/2 emission were measured simultaneously in the range 3x10^14 cm-3 < No < 1x10^16 cm-3 at constant temperature T = 585 K. It was found that the quantity No^2/I689 exhibited parabolic dependence on No, confirming that the quenching of the Cs 5DJ states is due to collisions with Cs ground-state atoms, not molecules. The coefficients of the second order polynomial fitted through the measured data yielded the cross sections s5/2->3/2 = (57 ą 19)x10^-16 cm^2 and sD = (35 ą 10)x1^0-16 cm^2 for the Cs 5DJ fine structure mixing and quenching, respectively, due to collisions with caesium ground-state atoms. Using recently calculated Cs*+Cs potentials we performed an analysis which shows good agreement between the measured values and the theoretical predictions.
excitation energy transfer; cross sections
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Podaci o izdanju
33 (16)
2000.
3001-3012-x
objavljeno
0953-4075