Features of the bremsstrahlung accompanying collisions with a hydrogen atom in an excited state |
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Authors: | A V Korol’ O I Obolenskii A V Solov’ev |
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Institution: | (1) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia |
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Abstract: | The features of the bremsstrahlung appearing during a collision of a fast charged particle with a hydrogen atom (or hydrogenic
ion) in an excited state are investigated. It is shown that the emission spectrum of photons with energies greater than the
ionization potential of a given excited state (except the 2s state) displays narrow lines, which are caused by de-excitation of the atom in an intermediate state. It is demonstrated
that the scattering of a charged particle on an excited hydrogen atom produces a feature which is not observed in the case
of scattering on a ground-state hydrogen atom. Expressions are obtained for the generalized dynamic polarizability of the
hydrogen atom and hydrogenic ions in the 1s, 2s, and 3s states. A method is developed for deriving expressions for the generalized dynamic polarizabilities of other excited states
through the use of the Coulomb Green’s function and representation of the electronic wave function in terms of the differentiation
of the generating functions of Laguerre polynomials. The bremsstrahlung cross sections for electrons and positrons colliding
with hydrogen atoms in the 1s, 2s, and 3s states are calculated.
Zh. Tekh. Fiz. 69, 7–13 (October 1999) |
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