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Journal of Physics B Atomic and Molecular Physics

Measurement and evaluation of differential scattering cross sections for Na2P3/2with Hg

Rudolf Düren, H -O Hoppe

Published Jun 28, 1978• 30 citations
Publisher

Abstract

The differential cross section has been measured for the interaction of Na 2 P 3/2 with Hg. The excitation of Na has been achieved with linearly polarised light of a CW dye laser. The measurements have been evaluated by fitting the parameters of a pseudopotential from which the interatomic potentials have been obtained. The scattering calculation for these interatomic potentials is performed by integrating the coupled Schrodinger equations for the six coupled channels resulting from the P states with J= 3 / 2 and 1 / 2 and their respective values of m j . This experiment and the experiment for the ground-state interaction are now both described by a common calculation using the pseudopotential method.

DOI
10.1088/0022-3700/11/12/014

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We report high-resolution measurements of the differential cross section for scattering Na in its 3Ssub1sub 1sub1/sub2sub 2sub2 and 3Psub3sub 3sub3/sub2sub 2sub2 states from Ne. A new scheme is used to maintain a high fraction (approx.20%) of an atomic beam of Na in the excited state for many radiative lifetimes using a single-mode cw dye laser. The differential cross sections are interpreted to yield interatomic potential curves for both the XSigmaSigmaSigma and APi states of the NaNe molecule which seriously disagree with recent pseudopotential calculations. (AIP)
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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.