Accession Number : ADA190341

Title :   Statistical Fine Structure in Inhomogeneously Broadened Absorption Lines in Solids.

Descriptive Note : Interim technical rept.,

Corporate Author : IBM ALMADEN RESEARCH CENTER SAN JOSE CA

Personal Author(s) : Moerner, W E ; Carter, T P

PDF Url : ADA190341

Report Date : 22 Dec 1987

Pagination or Media Count : 10

Abstract : By using laser FM spectroscopy, we have observed statistical fine structure (SFS) in the inhomogeneously broadened zero-phonon S1 : SO (O-O) absorption of pentacene molecules in crystals of p-terphenyl at liquid helium temperatures. SFS results from variations in the spectral density of absorbers with optical wavelength due to statistics, illustrating that the inhomogeneous line profile is not a simple, smooth Gaussian function as has been previously assumed but rather contains significant fine structure. Theoretical analysis of the SFS spectra using auto-correlation techniques can be used to estimate the underlying value of the homogenous linewidth. This new observation not only provides a novel way to study the statistics of inhomogeneous broadening, but it also allows estimation of the homogenous width without requiring spectral hole-burning or coherent transient techniques. Keywords: Spectral hole-burning, Inhomogeneous broadening, Statistical fine structure.

Descriptors :   *ABSORPTION SPECTRA, *CRYSTALS, *LINE SPECTRA, *BENZENE, *PHENYL RADICALS, *ANTHRACENES, ABSORBERS(MATERIALS), ABSORPTION, AUTOCORRELATION, COHERENCE, FREQUENCY, FREQUENCY MODULATION, HOMOGENEITY, LASERS, LIQUID HELIUM, MOLECULES, OPTICAL PROPERTIES, SPECTRAL ENERGY DISTRIBUTION, SPECTRAL LINES, SPECTROSCOPY, STATISTICS, TEMPERATURE, THEORY, TRANSIENTS, WIDTH, BENZYL RADICALS, CRYSTAL STRUCTURE, PHONONS

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE