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Books > Science & Mathematics > Physics > Atomic & molecular physics
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Computational Methods for Electron-Molecule Collisions (Hardcover, 1995 ed.)
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Computational Methods for Electron-Molecule Collisions (Hardcover, 1995 ed.)
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The collision of electrons with molecules and molecular ions is a
fundamental pro cess in atomic and molecular physics and in
chemistry. At high incident electron en ergies, electron-molecule
collisions are used to deduce molecular geometries, oscillator
strengths for optically allowed transitions, and in the case of
electron-impact ionization, to probe the momentum distribution of
the molecule itself. When the incident electron energy is
comparable to or below those of the molecular valence electrons,
the physics involved is particularly rich. Correlation and exchange
effects necessary to describe such collision processes bear a close
resemblance to similar efft: cts in the theory of electronic
structure in molecules. Compound state formations, in the form of
resonances and vir tual states, manifest themselves in experimental
observables which provide details of the electron-molecule
interactions. Ro-vibrational excitations by low-energy electron
collisions exemplify energy transfer between the electronic and
nuclear motion. The role of nonadiabatic interaction is raised
here. When the final vibrational state is in the continuum,
molecular dissociation occurs. Dissociative recombination and
dissociative attachment are examples of such fragmentation
processes. In addition to its fundamental nature, the study of
electron-molecule collisions is also motivated by its relation to
other fields of study and by its technological appli cations. The
study of planetary atmospheres and the interstellar medium
necessarily involve collision processes of electrons with molecules
and molecular ions."
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