Peter R. Fontana
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View article: Electrical analogs of atomic radiative decay processes
Electrical analogs of atomic radiative decay processes Open
Simple electrical circuits are analyzed, and the results show that for high frequencies they have frequency and time responses identical to the spontaneous radiative decays of atoms. As an illustration of the analogy a two-circuit electric…
View article: Effects of coupled atomic states on the resonance scattering of radiation
Effects of coupled atomic states on the resonance scattering of radiation Open
The excitation and decay probabilities for resonance scattering of radiation from an atom with two coupled excited states in an external static field are calculated as a function of time and frequency. Various oscillatory terms are found i…
View article: Holes in Spectral Lines
Holes in Spectral Lines Open
The decay of an atom in the presence of a static perturbation is investigated. The perturbation couples a decaying state with a nondecaying state. A "hole" appears in the emission line at a frequency equal to the frequency difference betwe…
View article: One- and Two-Center Expansions of the Breit-Pauli Hamiltonian
One- and Two-Center Expansions of the Breit-Pauli Hamiltonian Open
The orbit-orbit, spin-spin, and spin-orbit Hamiltonians of the Breit-Pauli approximation are expressed in terms of irreducible tensors. One- and two-center expansions are given in a form in which the coordinate variables of the interacting…
View article: Configuration Interaction in Two- and Three-Electron Atoms
Configuration Interaction in Two- and Three-Electron Atoms Open
The ground states of the first four members of the helium isoelectronic series and the 22S and 22P states of lithium are calculated using a configuration-interaction expansion in a complete denumerable set of single-particle functions, wit…
View article: Dipole—Quadrupole and Retardation Effects in Low-Energy Atom—Atom Scattering
Dipole—Quadrupole and Retardation Effects in Low-Energy Atom—Atom Scattering Open
Simple approximation formulas are derived for the dipole—quadrupole and retardation effects upon the total elastic scattering cross section for atomic collisions in the thermal energy range. For a long-range potential containing both the d…