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):
Report Date:
1987-12-22
Pagination or Media Count:
10.0
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