Three-body collisions involving Na(3P), Rb(5S) and buffer gas atoms

S. A. Abdullah, M. Allegrini, Silvia Gozzini +1 more

M. Tamanis, O. Docenko, A. Pashov

沈异凡, 李万兴

Energy pooling in the Na-Rb vapor mixture has been investigated.While some kind of buffer gas is introduced into the cell the peculiar features appear.The buffer gas enhances the energy transfer betwwen Na(3P) and Rb(5S),which can be detected through the effects induced on the highly excited states populated by the Na(3P)/Rb(5P) and Rb(5P)/Rb(5P) collisions.

Xihua Yang, Yongfang Li, Zhenrong Sun +2 more

We report on an experimental observation of constructive quantum interference between two atomic transition pathways 3P 1/2 -5S (or 4D) and 3P 3/2 -5S (or 4D) via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na 2 -Na system. Through the special excitation processes, constructive quantum interference is realized for a Λ-type quantum-beat configuration with a widely-spaced doublet (about 17 cm -1 ) in the excited sodium atom driven by one laser. The dependences of quantum interference on the argon buffer gas pressure and sample temperature are also examined.

LeRoy F. Cook, D. A. Olsgaard, Mark D. Havey +1 more

An experimental investigation of the atomic-Na 3s $^{2}$${\mathit{S}}_{1/2--}$5s $^{2}$${\mathit{S}}_{1/2}$ two-color two-photon polarization spectrum has been made. Measurements of the linear polarization degree of the two-photon transition were made for one laser tuned within a \ifmmode\pm\else\textpm\fi{}100 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ range of the atomic-Na 3p $^{2}$${\mathit{P}}_{\mathit{j}}$ levels, with the second adjusted to satisfy the two-photon resonance condition. The relatively short-pulse (\ensuremath{\sim}0.5 ns) lasers used eliminate effects on the spectrum due to atomic-Na hyperfine interactions and radiation trapping, while greatly reducing depolarization due to collisions with Ar gas. In the absence of collisions, the measured polarization spectrum is in excellent agreement with calculations. Measurements of the Ar pressure dependence of the spectrum revealed strong depolarization in the vicinity of resonant excitation through the 3p $^{2}$${\mathit{P}}_{3/2}$ level. A collisional depolarization cross section of 200(30) \AA{} for this process was deduced from the data.

Zvjezdana Roller-Lutz, Y. Wang, S Bradenbrink +4 more