Naslov
Mixing and quenching of the Cs 5DJ states induced by collisions with caesium ground-state atoms

Autori
Movre, Mladen ; Vadla, Čedomil ; Horvatić, Vlasta

Izvornik
Journal Of Physics B-Atomic Molecular And Optical Physics (0953-4075) 33 (2000), 16; 3001-3012

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
excitation energy transfer; cross sections

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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