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Mechanism of nonphotochemical hole burning: Cresyl Violet in polyvinyl alcohol films

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Abstract

Polarized nonphotochemical hole-burned spectra of Cresyl Violet in polyvinyl alcohol films are presented for various burn temperatures (TB). For TB = 15 K, but not for TB = 2.2 K, a significant rotation of Cresyl Violet is indicated. The broad, tailing antihole is observed to depend on TB. The quantum efficiency distributions for the zero-phonon hole and pseudo-phonon sideband are quite similar, proving that the phonons created by excitation of the phonon sideband are not important for hole burning. The quantum efficiency is independent of TB over the range studied, 1.6–15 K. Over this range essentially 100% of the zero-phonon lines can be burned. The results show that the standard two-level-system (extrinsic) model for nonphotochemical hole burning is inadequate. The results are discussed in terms of an outside-in hierarchy of configurational relaxation events model [ Chem. Phys.141, 447 ( 1990)] as well as other models.

© 1992 Optical Society of America

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