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.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE