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High‐resolution optical spectroscopy of polymers: Molecular potentials and internal fields
Author(s) -
Haarer D.,
Kador L.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910440115
Subject(s) - resolution (logic) , degenerate energy levels , spectroscopy , amorphous solid , absorption (acoustics) , materials science , absorption spectroscopy , spectral resolution , spectral hole burning , laser , high resolution , molecular physics , spectral line , molecule , optics , polymer , analytical chemistry (journal) , chemistry , physics , crystallography , chromatography , quantum mechanics , astronomy , artificial intelligence , computer science , composite material , geology , remote sensing , organic chemistry
Photochemical hole burning is a spectroscopic method which creates, via laser irradiation at low temperatures, narrow persistent dips in the inhomogeneous absorption bands of solids which are doped with appropriate dye molecules. Especially in amorphous samples, the spectral width of these dips can be several orders of magnitude smaller than that of the total inhomogeneous bands. This does not only provide an enormous increase in spectral resolution, but in addition it allows to select very small subsets of absorbers in the sample with accidentally degenerate transition frequencies. It can be shown that by applying external fields, material parameters and molecular potentials can be probed.