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Energy-pooling collisions in Cs. 6PJ+6PJ to 6S+(nl=7P, 6D, 8S, 4F) (CROSBI ID 79977)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Jabbour, Z.J. ; Namiotka, R.K. ; Huennekens, J. ; Allegrini, M. ; Milošević, Slobodan ; Detomasi, F. Energy-pooling collisions in Cs. 6PJ+6PJ to 6S+(nl=7P, 6D, 8S, 4F) // Physical review. A, Atomic, molecular, and optical physics, 54 (1996), 2; 1372-1384

Podaci o odgovornosti

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

engleski

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

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.

energy-pooling; cesium

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Podaci o izdanju

54 (2)

1996.

1372-1384

objavljeno

1050-2947

Povezanost rada

Fizika

Indeksiranost