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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a190341.pdf


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