Abstract
Superelastic electron scattering involving the collisionalde-excitation of laser-excited 138Ba(...6s6p 1P1)atoms to the (...6s2 1S0) ground state has been used tomeasure electron impact coherence parameters for the related(...6s2 1S0) to (...6s6p 1P1) inelasticprocess. Measurements of the orbital angular momentum transferparameter, Lperp+, were made for excitation at impactenergies of 7, 8.5, 11 and 16 eV. Experimental data arecompared with available theoretical results.
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