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Optics Letters

Observation of dipole–quadrupole radiative collisional fluorescence

J. C. White

Published Jun 1, 1980• 12 citations
Publisher

Abstract

The first known observation of spontaneous dipole-quadrupole radiative emission during the collision of an excited Ba atom with an excited Ti atom is reported. The emission occurs at the sum energy of the excited atoms and is the dipole-quadrupole analog of the dipole-dipole emission process recently reported. A collision cross section for spontaneous radiative de-excitation of 1.5 X 10(-22) cm2 is measured.

DOI
10.1364/ol.5.000239

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Optics Letters•Sep 1, 1979•32 citations
The first known observation of spontaneous dipole-quadrupole radiative emission during the collision of an excited Ba atom with an excited Ti atom is reported. The emission occurs at the sum energy of the excited atoms and is the dipole-quadrupole analog of the dipole-dipole emission process recently reported. A collision cross section for spontaneous radiative de-excitation of 1.5 X 10(-22) cm2 is measured.
We report the observation of spontaneous radiative emission during the collision of two excited Ba atoms. The emission occurs at the sum energy of the excited atoms and is the emission analog of the laser-induced inelastic collision process. We measure a collision cross section for deexcitation by spontaneous radiative emission of 2.6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}20}$ cm2{\mathrm{cm}}^{2}cm2.
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.
The cross sections for the excitation energy transfer in the collisional processes Na*(3P 1 2/)+M(nS 1 2/) to or from Na*(3p 3 2/)+m(Ns 3 2/), m being ground-state Rb (n=5) or Cs (n=6) atom, have been measured by laser fluorescence method. With either of the two sodium 3P fine-structure states optically excited, the intensity ratio of the sensitized to direct fluorescence was measured. The polarization effects due to partially polarized and anisotropic direct fluorescence were investigated. The measured cross sections (T=530 K) for the sodium 3P fine-structure excitation transfer induced by collisions with Rb are: sigma ( 1 / 2 to 3 / 2 )=170 AA 2 , with an overall accuracy of 20%. The corresponding values in the Cs case are: sigma ( 1 / 2 to 3 / 2 )=140 AA 2 , sigma ( 3 / 2 to 1 / 2 )=83 AA 2 . The theoretical calculations reveal the decisive role of the dipole-quadrupole interaction. The obtained values are in satisfactory agreement with the experiment only if both the dipole-dipole and dipole-quadrupole interactions are taken into account, while the calculations involving the dipole-dipole term alone yield the cross section values which are as much as one order of magnitude lower than the experimentally observed ones.