Accession Number : ADA187508

Title :   Spontaneous Decay and Atomic Fluorescence Near a Metal Surface of an Absorbing Dielectric.

Descriptive Note : Technical rept.,

Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY

Personal Author(s) : Arnoldus, Henk F ; George, Thomas F

PDF Url : ADA187508

Report Date : Oct 1987

Pagination or Media Count : 36

Abstract : Optical properties of an atom in the vicinity of a metal or dielectric are different from those in free space. The spontaneous decay of an atom with two degenerate levels is studied, where the relaxation operator is obtained as a function of the atom-surface separation and the complex bulk dielectric constant epsilon(omega). The Einstein coefficient A(m)(e) of an excited state jeme appears to depend on the magnetic quantum number me. A sum rule for A(m)(e) is derived, and from the rotational symmetry with respect to the surface normal it is found that A(m)(e) = A(-m)(e). A general expression for the fluorescent radiation field in the far zone is then derived, which incorporates the polarization properties of the fluorescence, as they are modified by the presence of the dielectric. It is shown that the angular distribution of the emitted intensity depends strongly on epsilon(omega), and it is pointed out how information about the substrate, e.g., epsilon(omega), can be extracted from the temporal statistical behavior of the emitted photons. It is emphasized that the major surface effects are purely geometrical, despite the essential quantum nature of the problem. Keywords: Spontaneous decay, Atomic fluorescence, Atom near metal surface, Absorbing dielectric, Einstein coefficient, Magnetic quantum number.

Descriptors :   *FLUORESCENCE, *ATOMIC SPECTRA, ANGLES, ATOMS, DISTRIBUTION, MAGNETIC FIELDS, METALS, OPTICAL PROPERTIES, PHYSICAL PROPERTIES, POLARIZATION, QUANTUM THEORY, SEPARATION, SUBSTRATES, SURFACE PROPERTIES, SURFACES, SYMMETRY, RADIATION ABSORPTION, DIELECTRICS, SURFACE ENERGY, DECAY SCHEMES, RELAXATION TIME

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE