[Energy-pooling collisions of rubidium atoms: Rb (5P(J)) + Rb (5P(J))--> Rb (5S) + Rb (nl = 5D,7S)].

Baoxia Mu, Shuying Wang, Xiu-Hua Cui, Gang-Tai Zhang, Qianghua Yuan, Kang Dai, Yifan Shen

Published Sep 1, 2006• 1 citation

Abstract

An experimental study of rubidium energy pooling collisions, Rb(5P(J)) + Rb(5P(J))-->Rb(nlJ') + Rb(5S), at thermal energies, was carried out in a cell. Atoms were excited to either the 5P 1/2 or 5P 3/2 state using a single-mode diode laser. The excited atom density and spatial distribution were mapped by monitoring the absorption of a counter-propagating single-mode diode laser beam, tuned to either 5P 1/2-->5D 3/2 or 5P 3/2-->7S 1/2 transition, which could be translated parallel to the pump beam. The excited atom densities were combined with the measured fluorescence ratios to determine cross sections for the rubidium energy pooling process. For 5P 3/2 excitation the cross sections for nlJ' being 5D 5/2, 5D 3/2, and 7S 1/2 are (1.32+/-0.59) x 10(-14), (1.18+/-0.53) x 10(-14) and (3. 21+/-1. 44) x 10(-15) cm2, respectively. For 5P 1/2 excitation the cross sections for nlJ' being 5D 5/2 and 5D 3/2 are (6.57+/-2.96) x 10(-15), and (5.90+/-2.66) x 10(-15) cm2, respectively. The results were compared with those of other experiments.

Related papers

Energy-Pooling Collisions in Rubidium: 5 P 3/2 +5 P 3/2 →5 S +( nl = 5 D ,7 S )

Shen Yi-Fan, Kang Dai, Baoxia Mu +2 more

We experimentally study rubidium energy pooling collisions of Rb(5 P 3/2 )+Rb(5 P 3/2 )→Rb(5 S 1/2 )+Rb ( nl J = 5 D J ,7 S 1/2 ) at low densities in a cell using diode laser excitation. The excited-atom density and spatial distribution are mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam, tuned to the 5 P 3/2 →7 S 1/2 transition, which could be translated parallel to the pump beam. The excited atom densities are combined with measured fluorescence ratios to determine cross sections for the rubidium energy pooling process. The cross sections for nl J being 5 D 5/2 , 5 D 3/2 , and 7 S 1/2 are (1.32±0.59) × 10 −14 , (1.18±0.53) × 10 −14 and (3.21±1.44) × 10 −15 cm 2 , respectively.

Chinese Physics LettersOct 27, 200513 citations

Energy-pooling collisions in Rb-Cs vapor mixture Rb(5P_(J))+Cs(6P_(3/2))-->Rb(5S_(1/2))+Cs(nl_(J'))

Yifan Shen, Kang Dai, Baoxia Mu +2 more

Rate coefficients for energy-pooling (EP) collisions Rb(5P_(J))+Cs(6P_(3/2))-->Rb(5S_(1/2))+Cs(nl_(J')) have been measured. Atoms were excited to Rb(5P_(J)) and Cs(6P_(3/2)) states using two single-mode diode lasers. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique has been adopted. The excited-atom density and spatial distribution are mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam, tuned to Rb(5P_(J)-->7S_(1/2)) and Cs(6P_(3/2)-->8S_(1/2)) transitions respectively, which could be translated parallelly to the pump beams. The excited atom densities are combined with the measured fluorescence ratios to determine cross sections for the EP processes. It was found that Rb(5P_(J))+Cs(6P_(3/2)) collisions are more efficient than Rb(5P_(3/2))+Cs(6P_(3/2)) collisions for populating Cs(4F_(5/2)), while the opposite is true for populating Cs(4F_(7/2)).

Chinese Optics LettersSep 10, 20060 citations

Energy-pooling collisions in rubidium:5P_J+5P_J′→5S+5D_J″

Yifan Shen

An experimental study of rubidium energy pooling collisions,5P_J+5P_J′→5S+5D_J″,at thermal energies,has been carried out in a cell.Atoms were excited to either the 5P_1/2 or 5P_3/2 state using a single-mode diode laser.The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam,tuned to either 5P_1/2→5D_3/2,5P_3/2→7S_1/2 transition,which could be translated parallel to the pump beam.The excited atom densities are combined with measured fluorescence ratios to determine cross sections for the rubidium energy pooling process 5P_J+5P_J′→5S+5D_J″.Two tunable cw diode lasers were used to excite 5P_1/2 and 5P_3/2 respectively and the 5D_J″→5P_J fluorescence intensities were measured.For 5P_3/2+5P_1/2 collisions the cross sections for 5D_5/2,5D_3/2 are(1.12±0.50)×10~-14 and(1.01±0.45)×10~-14 cm~2,respectively.

Journal of Atomic and Molecular PhysicsJan 1, 20060 citations

Energy-pooling collisions in Rb-Cs vapor mixture Rb（5PJ）＋Cs（6P3/2） → Rb（5S1/2）＋Cs（nlJ＇）

沈异凡, 戴康, 穆保霞 +2 more

Rate coefficients for energy-pooling (EP) collisions Rb(5PJ) + Cs(6P3/2)→Rb(5S1/2) + Cs(nlJ’) have been measured. Atoms were excited to Rb(5PJ) and Cs(6P3/2) states using two single-mode diode lasers. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique has been adopted. The excited-atom density and spatial distribution are mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam, tuned to Rb(5PJ→7S1/2) and Cs(6P3/2→8S1/2) transitions respectively, which could be translated parallelly to the pump beams. The excited atom densities are combined with the measured fluorescence ratios to determine cross sections for the EP processes. It was found that Rb(5P1/2) + Cs(6P3/2) collisions are more efficient than Rb(5P3/2) + Cs(6P3/2) collisions for populating Cs(4F5/2), while the opposite is true for populating Cs(4F7/2).更多还原

Chinese Optics LettersJan 1, 20060 citations

Resonant Reaction in Rb–Cs Vapour Mixture Rb(5 P 1/2 ) + Cs(6 P 3/2 ) → Cs(8 S 1/2 ) + Rb(5 S 1/2 )

Shen Yi-Fan, Kang Dai, Baoxia Mu +2 more

We experimentally study energy-pooling collision in the Rb–Cs vapour mixture at low densities in a cell. Atoms are excited to Rb(5 P 1/2 ) and Cs(6 P 3/2 ) states using two single-mode diode lasers. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique is adopted. The excited-atom density and spatial distribution are mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam, tuned to Rb(5 P 1/2 →7 S 1/2 ) and Cs(6 P 3/2 →8 S 1/2 ) transitions, respectively, which could be translated parallel to the pump beams. The excited atom densities are combined with the measured fluorescence ratios to determine cross section for the energy-pooling process [i.e. Rb(5 P 1/2 ) + Cs (6 P 3/2 ) → Cs(8 S 1/2 ) + Rb (5 S 1/2 )]. The cross section is 3.79×10 −14 cm 2 ±45%.

Chinese Physics LettersApr 28, 20062 citations

Fine-structure mixing in 5~2P Rb atoms studied through excitation transfer and energy-pooling collisions

Yifan Shen

Rb atoms were excited to the 5P3/2 level using a single-mode laser diode. The 5P3/2 state atom density was measured by the absorption of line from a Rb hollow-cathode lamp. The excited atom density is combined with measured fluorescence ratio to determine collisional cross section for the energy pooling process [i.e. Rb(5P3/2)+Rb(5P3/2)→Rb(5D)+Rb(5S)]. The cross section is (5.0±1.9)(?)10-14cm2. Cross section for 5P3/2 →5P1/2 transfer in Rb, induced in collision with ground-state Rb atoms, has been determined using methods of atomic fluorescence. The resulting fluorescence included a direct component arising from the optically excited state and a sensitized component due to the collisionally populated fine-structure state and the energy-pooling collisions. Measurement of relative intensities of the two components yielded the following cross section: σ(5P3/2→5P1/2)=(3.0±0.9)×10-15cm2. It is found that the rate for the energy pooling is an order of magnitude more efficient than 5P3/2→5P1/2 mixture. Comparisons of our result with other experiments have been made.

Chinese Journal of Quantum ElectronicsJan 1, 20051 citation