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- W144709969 abstract "We present a measurement of diagonal and real off-diagonal germs of the density matrix describing H(n=3) atoms produced by electron capture of 20 - 100 keV protons colliding with Ar. These elements of the excited atoms` density matrix are used to determine important parameters of the collisionally-produced H atom, including the atom`s electric dipole moment and cross sections for electron capture to angular momentum substates of n=3. The matrix is determined by analysis of the polarization of Balmer-{alpha} light emitted by the radiative decay of the atoms in an external electric field. A new polarimeter, employing a photoelastic modulator, has allowed us to subtract undesired background from excited Ar atoms. The dipole moment and the probablity density of the excited H atoms produced from the Ar target show similar qualitative behavior to those from a He target at higher beam energies, while their behavior is markedly different below 35 keV. Data will be presented along with a comparison of the PEM to other polarimeters." @default.
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- W144709969 date "1993-05-01" @default.
- W144709969 modified "2023-09-27" @default.
- W144709969 title "Analysis of the substate distribution of H(n=3) atoms from electron capture by protons on Ar" @default.
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