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Acta Physica Sinica

EXCITATION ENERGY TRANSFER BY COLLISIONS BETWEEN EXCITED RUBIDIUM ATOMS

Jin Wang, Zhengfa Hu, Deng-Yu Zhang, Mingsheng Zhan, (1)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉 430071; (2)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉 430071;中国科学院安徽光学精密机械研究所激光光谱学开放实验室，合肥 230031

Published Jan 1, 1998• 1 citation
Publisher

Abstract

This paper reports the experimental observation of the excitation energy transfer to higher states by collisions between two rubidium atoms excited to a specific state by a CW single mode laser. An obvious competition has been observed between the channel of transition to the ground state by spontaneous emission, and that to higher excited states by collisions of two excited atoms. Formation rates of the high excited states with different laser power, atomic vapor temperature and laser detuning have been measured. A proposed mechanism well explained the experimental result.

DOI
10.7498/aps.47.1265

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Journal of Applied Physics•Nov 1, 1977•27 citations
This paper reports the experimental observation of the excitation energy transfer to higher states by collisions between two rubidium atoms excited to a specific state by a CW single mode laser. An obvious competition has been observed between the channel of transition to the ground state by spontaneous emission, and that to higher excited states by collisions of two excited atoms. Formation rates of the high excited states with different laser power, atomic vapor temperature and laser detuning have been measured. A proposed mechanism well explained the experimental result.
This paper reports the experimental observation of the higher states' fluorescence changing with laser power,which was populated through energy polling collisions between two excited sodium atoms excited to the first excited state by a CW single mode laser in sodium vapor. A proposed collision transfer mechanism combining with the rate equations of an approximate two levels system well explained the experimental result. The association of theory analysis with experiment data obtained the changing character of the different collision transfer rates k 4D ,k 5P ,k 4P ,k 5S corresponding to the higher excited states following laser power variation.
Cesium molecules are pumped by a CW dye laser. Some of the excited molecules then pre-dissociate or collisionally transfer excitation to produce excited atoms at the 5D and 6P levels. The cross sections (in units of 10-14cm2) for the excitation transfer process Cs(6P)+Cs(5D) →Cs(7DJ)+Cs(6S)for J being 5/2 and 3/2 are 5. 4 ± 50% and 4. 9 ± 50%, respectively. The cross sections (in units of 10-14cm2) for the excitation transfer out of the 7D doublet [i. e. , Cs(7DJ)+Cs(6S) →states other than Cs(7D)] for J being 5/2 and 3/2 are 1. 6 ±50% and 0. 34±50%, respectively. To obtain these cross sections, the intensities of 7D and 5D fluorescence emissions and the 6P atom density are measured by using the absorption equivalent width technique. The results are discussed in eomparison with those of other experiments.
Collisional energy transfer between atoms and molecules proved to be an efficient method for excitation of new laser lines and spectroscopy of states forbidden for direct excitation or emission by parity conservation [1]. We have studied a number of stimulated emissions in the near IR 800 - 850nm in Na atom via Na2X—A transitions. Two tunable dye lasers have been employed, the first one scanning the X—A molecular transition and the second one tuned to Na 3p-4d single photon resonance, Fig.1. Taking the collision rate coefficient for the reaction
Sensitized fluorescence in cesium vapor induced by collisions with excited rubidium atoms was investigated in order to determine the total cross sections for inelastic collisions between excited rubidium atoms and cesium atoms in their ground states. The partial pressure of the rubidium vapor in the Rb–Cs mixture was kept below 2 × 10−5 mm Hg in order to eliminate effects due to the trapping of the Rb resonance radiation. The collision cross sections for the various excitation transfer processes are as follows: Q12′(Rb 5 2P1/2 → Cs 6 2P3/2) = 1.5 Å2; Q11′(Rb 5 2P1/2 → Cs 6 2P1/2) = 0.5 Å2; Q22′(Rb 5 2P3/2 → Cs 6 2P3/2) = 0.9 Å2; Q21′(Rb 5 2P3/2 → Cs 6 2P1/2) = 0.3 Å2. The fact that the cross sections are considerably smaller than those for collisions between similar atoms indicates that the Rb–Cs interactions probably involve van der Waals' forces with a much shorter range than exchange forces, which play a dominant role in Rb–Rb or Cs–Cs collisions.
The 8 2S^{2}S2S state of rubidium is selectively populated by stepwise excitation using light from a rubidium lamp and a tunable dye laser. Excitation transfer from the 8 2S^{2}S2S to the 6 2D^{2}D2D state is studied in a glass cell containing rubidium vapor and noble-gas atoms at different pressures and ground-state rubidium atoms as perturbers. The thermally averaged cross sections for excitation transfer (in units of ${10}^{\mathrm{\ensuremath{-}}15}$ cm2{\mathrm{cm}}^{2}cm2) are 0.13\ifmmode\pm\else\textpm\fi{}0.05, 3.0\ifmmode\pm\else\textpm\fi{}1.2, 2.2\ifmmode\pm\else\textpm\fi{}0.9, 1.7\ifmmode\pm\else\textpm\fi{}0.7, and 4.3\ifmmode\pm\else\textpm\fi{}2.6 for the noble gases He, Ne, Ar, Kr, and Xe, respectively, and (6.7\ifmmode\pm\else\textpm\fi{}3.0)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}13}$ cm2{\mathrm{cm}}^{2}cm2 for rubidium atoms. The results show that the excitation-transfer cross sections for intermediately excited states cannot be accurately scaled from simple models.