Naslov
Energy-pooling collisions in Cs. 6PJ+6PJ to 6S+(nl=7P, 6D, 8S, 4F)

Autori
Jabbour, Z.J. ; Namiotka, R.K. ; Huennekens, J. ; Allegrini, M. ; Milošević, Slobodan ; Detomasi, F.

Izvornik
Physical review. A, Atomic, molecular, and optical physics (1050-2947) 54 (1996), 2; 1372-1384

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

Ključne riječi
energy-pooling; cesium

Sažetak
We report experimental rate coefficients for the energy-pooling collisions Cs(6P1/2)+Cs(6P1/2) to Cs(6S1/2) + Cs(nlJ') and Cs(6P3/2)+Cs(6P3/2) to Cs(6S1/2) + Cs(nlJ') where nlJ'= 7P1/2, 7P3/2, 6D3/2, 6D5/2, 8S1/2, 4F5/2, or 4 F7/2. Atoms were excited to either the 6P1/2 or 6P3/2 state using a single-mode Ti:sapphire laser. The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode ring dye laser beam, tuned to either the 6P1/2 to 8S1/2 or 6P3/2 to 7D3/2, 5/2 transiitons, which could be translated parallel to the pump beam. Transmission factors, which describe the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed, were calculated for all relevant transitions. Effective lifetimes of levels populated by energy-pooling collisions are modified by radiation trapping, and these factors were calculated using Molisch theory. These calculated quantities have been combined with the measured excited-atom densities and fluorescence ratios to yeild absolute energy-pooling rate coefficients. It was found that the rate for production, in all cases, is greatest for 6D, but that 1/2-1/2 collisions are significantly more efficient then 3/2-3/2 collisions for populating 7P. It was also found that 7P1/2 is populated two or three times more efficiently then 7P3/2 in 1/2-1/2 collisions, but that the 7P fine structure levels are approximately equally populated in 3/2-3/2 collisions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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