Comparison of Classical and Quantum Bremsstrahlung

Journal Article · Tue Aug 26 04:00:00 EDT 2003 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1619679· OSTI ID:20632552

Pratt, R H ^[1]; Uskov, D B ^[2]; Korol, A V ^[3]; Obolensky, O I ^[4]

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1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA. 15260 (United States)
2. P.N. Lebedev Physical Institute, 119991 Moscow (Russian Federation)
3. St. Petersburg State Maritime Technical University, St.Petersburg 198262 (Russian Federation)
4. A.F. Ioffe Physico-Technical Institute, St. Petersburg 194021 (Russian Federation)

Classical features persist in bremsstrahlung at surprisingly high energies, while quantum features are present at low energies. For Coulomb bremsstrahlung this is related to the similar properties of Coulomb scattering. For bremsstrahlung in a screened potential, the low energy spectrum and angular distribution exhibit structures. In quantum mechanics these structures are associated with zeroes of particular angular-momentum transfer matrix elements at particular energies, a continuation of the Cooper minima in atomic photoeffect. They lead to transparency windows in free-free absorption. The trajectories of these zeroes in the plane of initial and final transition energies (bound and continuum) has been explored. Corresponding features have now been seen in classical bremsstrahlung, resulting from reduced contributions from particular impact parameters at particular energies. This has suggested the possibility of a more unified treatment of classical and quantum bremsstrahlung, based on the singularities of the scattering amplitude in angular momentum.

• OSTI ID: 20632552
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 680; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
ANGULAR MOMENTUM TRANSFER
BREMSSTRAHLUNG
COMPARATIVE EVALUATIONS
COULOMB SCATTERING
ENERGY SPECTRA
IMPACT PARAMETER
MATRIX ELEMENTS
OPACITY
QUANTUM MECHANICS
RELATIVISTIC RANGE
SCATTERING AMPLITUDES
SINGULARITY