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Physical Review A

Observation of laser-induced inelastic collisions

R. W. Falcone, William R. Green, J. C. White, J. F. Young, Stephen E. Harris

Published Mar 1, 1977• 136 citations
Publisher

Abstract

We describe two new experiments which demonstrate laser-induced inelastic collisions. Energy was stored in the Sr $5p^{1}P^{o}$ state and selectively transferred both to the Ca $4{p}^{2}^{1}S$ and $5d^{1}D$ states. The collision cross sections maximized at the interatomic wavelengths of 4977 and 4711 \AA{}, respectively, and had a half-power width of about 14 ${\mathrm{cm}}^{\ensuremath{-}1}$.

DOI
10.1103/physreva.15.1333

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Physical Review A•Apr 1, 1981•9 citations
We describe two new experiments which demonstrate laser-induced inelastic collisions. Energy was stored in the Sr 5p1Po5p^{1}P^{o}5p1Po state and selectively transferred both to the Ca 4{p}^{2}^{1}S and 5d1D5d^{1}D5d1D states. The collision cross sections maximized at the interatomic wavelengths of 4977 and 4711 \AA{}, respectively, and had a half-power width of about 14 cm\ensuremath−1{\mathrm{cm}}^{\ensuremath{-}1}cm\ensuremath−1.
We report measurements of cross sections greater than ${10}^{\ensuremath{-}13}$ cm2{\mathrm{cm}}^{2}cm2 for laser-induced inelastic collisions between Sr and Ca. We describe an experimental system which produces such large cross sections and which greatly facilitates the study of laser-induced collisions through its ability to reduce noise from other collisional processes.
The inelastic collisional cross sections of the nD\mathrm{nD}nD states of Cs are measured by the technique of selective laser excitation and observation of collision-induced fluorescence. The cross sections (in units of ${10}^{\ensuremath{-}14}$ cm2{\mathrm{cm}}^{2}cm2) for the fine-structure-changing collisions [i.e., $\mathrm{Cs}(n^{2}D_{\frac{3}{2}})+\mathrm{Cs}(6^{2}S_{\frac{1}{2}})\ensuremath{\rightarrow}\mathrm{Cs}(n^{2}D_{\frac{5}{2}})+\mathrm{Cs}(6^{2}S_{\frac{1}{2}})$] for nnn being 6-10 are 2.7\ifmmode\pm\else\textpm\fi{}0.5, 3.7\ifmmode\pm\else\textpm\fi{}0.7, 8.6\ifmmode\pm\else\textpm\fi{}1.7, 18.4\ifmmode\pm\else\textpm\fi{}3.7, and 29.8\ifmmode\pm\else\textpm\fi{}6.0, respectively. The cross sections (in ${10}^{\ensuremath{-}14}$ cm2{\mathrm{cm}}^{2}cm2) for excitation transfer out of the nD\mathrm{nD}nD doublet [i.e., $\mathrm{Cs}(n^{2}D_{\frac{5}{2}})+\mathrm{Cs}(6^{2}S_{\frac{1}{2}})\ensuremath{\rightarrow}\mathrm{states}\mathrm{other}\mathrm{than} \mathrm{Cs}(\mathrm{nD})$] for nnn being 6-10 are 1.1\ifmmode\pm\else\textpm\fi{}0.6, 5.3\ifmmode\pm\else\textpm\fi{}1.5, 3.6\ifmmode\pm\else\textpm\fi{}1.5, 6.3\ifmmode\pm\else\textpm\fi{}2.3, and 15.5\ifmmode\pm\else\textpm\fi{}4.0, respectively. The fine-structure-changing cross sections are found to be nearly equal to the geometrical cross section $\ensuremath{\pi}{n}^{*4}{a}_{0}^{2}$ for all the nD\mathrm{nD}nD states studied, except 6D6D6D, whose fine-structure-changing cross section is unusually large.
Experimental studies of two laser-induced charge-transfer reactions in Ca and Sr are presented. In both reactions, a Ca ion collides with an Sr neutral in the presence of a laser field to produce a Ca neutral and an excited Sr ion. The two reactions differ in the final level of the Sr+{\mathrm{Sr}}^{+}Sr+ species. The collision cross sections associated with these reactions are studied as functions of applied laser frequency and power density. The largest cross section induced is equal to ${10}^{\ensuremath{-}16}$ cm2{\mathrm{cm}}^{2}cm2, obtained at a power density of 2\ifmmode\times\else\texttimes\fi{}109{10}^{9}109 W/cm2{\mathrm{cm}}^{2}cm2. Differences in experimental results associated with the two reactions are explained qualitatively by an examination of the potential curves of the CaSr+{\mathrm{Sr}}^{+}Sr+ quasimolecule.
Observations are made of dipole-quadrupole laser-induced inelastic collisions occurring during the collision of two Ba atoms. Results for both stimulated-absorption and spontaneous-emission experiments using the same collisional configuration are reported for the first time. In both experiments the interaction maximizes at the $R=\ensuremath{\infty}$ wavelength and has a full-width-at-half-maximum linewidth of \ensuremath{\sim}8 ${\mathrm{cm}}^{\ensuremath{-}1}$. These results bear on the study of the interatomic potentials for colliding atoms and permit the collisional energy transfer to states hitherto inaccessible to dipole-dipole collisions.