Physical Review A

Energy-pooling collisions in cesium: 6P/sub J/+6P/sub J/ to 6S+(nl=7P,6D,8S,4F) | NIST

Zeina J. Kubarych, Slobodan Milošević, A Allegrini, John Huennekens, R. K. Namiotka

Published Jan 1, 1996• 0 citations

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Physical Review A

Energy-pooling collisions in cesium: 6P/sub J/+6P/sub J/ to 6S+(nl=7P,6D,8S,4F) | NIST

Zeina J. Kubarych, Slobodan Milošević, A Allegrini, John Huennekens, R. K. Namiotka

Published Jan 1, 1996• 0 citations

OpenAlex

Related papers

Experimental study of cesium 5D ＋ 5D → 6S ＋（nL = 9D, 11S, 7F） energy pooling collisions

王倩, 戴康, 沈异凡

Chinese Optics LettersJan 1, 20070 citations

Energy-pooling collisions in cesium: 6 PJ +6 PJ →6S+(nl=7P,6D,8S,4F)

Z. J. Jabbour, R. K. Namiotka, John Huennekens +3 more

We report experimental rate coefficients for the energy-pooling collisions Cs(6 ${\mathit{P}}_{1/2}$ )+Cs(6 ${\mathit{P}}_{1/2}$ )\ensuremath{\rightarrow}Cs(6 ${\mathit{S}}_{1/2}$ )+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) and Cs(6 ${\mathit{P}}_{3/2}$ )+Cs(6 ${\mathit{P}}_{3/2}$ )\ensuremath{\rightarrow}Cs(6 ${\mathit{S}}_{1/2}$ )+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) where ${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$=7 ${\mathit{P}}_{1/2}$ , 7 ${\mathit{P}}_{3/2}$ , 6 ${\mathit{D}}_{3/2}$ , 6 ${\mathit{D}}_{5/2}$ , 8 ${\mathit{S}}_{1/2}$ , 4 ${\mathit{F}}_{5/2}$ , or 4 ${\mathit{F}}_{7/2}$ . Atoms were excited to either the 6 ${\mathit{P}}_{1/2}$ or 6 ${\mathit{P}}_{3/2}$ 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 6 ${\mathit{P}}_{1/2}$ \ensuremath{\rightarrow}8 ${\mathit{S}}_{1/2}$ or 6 ${\mathit{P}}_{3/2}$ \ensuremath{\rightarrow}7 ${\mathit{D}}_{3/2,5/2}$ transitions, 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 the Molisch theory. These calculated quantities have been combined with the measured excited-atom densities and fluorescence ratios to yield 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 than 3/2-3/2 collisions for populating 7P. It was also found that 7 ${\mathit{P}}_{1/2}$ is populated two to three times more efficiently than 7 ${\mathit{P}}_{3/2}$ in 1/2-1/2 collisions, but that the 7P fine-structure levels are approximately equally populated in 3/2-3/2 collisions. \textcopyright{} 1996 The American Physical Society.We report experimental rate coefficients for the energy-pooling collisions Cs(6${\mathit{P}}_{1/2}$)+Cs(6${\mathit{P}}_{1/2}$)\ensuremath{\rightarrow}Cs(6${\mathit{S}}_{1/2}$)+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) and Cs(6${\mathit{P}}_{3/2}$)+Cs(6${\mathit{P}}_{3/2}$)\ensuremath{\rightarrow}Cs(6${\mathit{S}}_{1/2}$)+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) where ${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$=7${\mathit{P}}_{1/2}$, 7${\mathit{P}}_{3/2}$, 6${\mathit{D}}_{3/2}$, 6${\mathit{D}}_{5/2}$, 8${\mathit{S}}_{1/2}$, 4${\mathit{F}}_{5/2}$, or 4${\mathit{F}}_{7/2}$. Atoms were excited to either the 6${\mathit{P}}_{1/2}$ or 6${\mathit{P}}_{3/2}$ 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 6${\mathit{P}}_{1/2}$\ensuremath{\rightarrow}8${\mathit{S}}_{1/2}$ or 6${\mathit{P}}_{3/2}$\ensuremath{\rightarrow}7${\mathit{D}}_{3/2,5/2}$ transitions, 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 the Molisch theory. These calculated quantities have been combined with the measured excited-atom densities and fluorescence ratios to yield 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 than 3/2-3/2 collisions for populating 7P. It was also found that 7${\mathit{P}}_{1/2}$ is populated two to three times more efficiently than 7${\mathit{P}}_{3/2}$ in 1/2-1/2 collisions, but that the 7P fine-structure levels are approximately equally populated in 3/2-3/2 collisions. \textcopyright{} 1996 The American Physical Society.

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Cross Section of the Electron-Induced 6s-6p Transition in Cesium

Lorin Kay Hansen

Journal of Applied PhysicsJan 1, 196412 citations

We report experimental rate coefficients for the energy-pooling collisions Cs(6

{\mathit{P}}_{1/2}

)+Cs(6

{\mathit{P}}_{1/2}

)\ensuremath{\rightarrow}Cs(6

{\mathit{S}}_{1/2}

)+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) and Cs(6

{\mathit{P}}_{3/2}

)+Cs(6

{\mathit{P}}_{3/2}

)\ensuremath{\rightarrow}Cs(6

{\mathit{S}}_{1/2}

)+Cs(${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$) where ${\mathit{nl}}_{\mathit{J}\ensuremath{'}}$=7

{\mathit{P}}_{1/2}

, 7

{\mathit{P}}_{3/2}

, 6

{\mathit{D}}_{3/2}

, 6

{\mathit{D}}_{5/2}

, 8

{\mathit{S}}_{1/2}

, 4

{\mathit{F}}_{5/2}

, or 4

{\mathit{F}}_{7/2}

. Atoms were excited to either the 6

{\mathit{P}}_{1/2}

or 6

{\mathit{P}}_{3/2}

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 6

{\mathit{P}}_{1/2}

\ensuremath{\rightarrow}8

{\mathit{S}}_{1/2}

or 6

{\mathit{P}}_{3/2}

\ensuremath{\rightarrow}7

{\mathit{D}}_{3/2,5/2}

transitions, 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 the Molisch theory. These calculated quantities have been combined with the measured excited-atom densities and fluorescence ratios to yield 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 than 3/2-3/2 collisions for populating 7P. It was also found that 7

{\mathit{P}}_{1/2}

is populated two to three times more efficiently than 7

{\mathit{P}}_{3/2}

in 1/2-1/2 collisions, but that the 7P fine-structure levels are approximately equally populated in 3/2-3/2 collisions. \textcopyright{} 1996 The American Physical Society.