Spectral hole-burning and magnetic circular dichroism of matrix-isolated copper phthalocyanine

Persistent spectral hole-burning in the Q-band region is reported for a concentrated (≈ 2 × 10 −2 mol l −1) matrix of copper phthalocyanine in solid Ar at 1.6 K. Hole-burning occurs with a quantum efficiency of ≈ 10 −6 and can be reversed by annealing at ≈ 28 K. Vibrational side holes allow determin...

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Published in:Chemical physics letters 1996-10, Vol.260 (5), p.522-528
Main Authors: Dunford, Cara L., Williamson, Bryce E., Schatz, Paul N., Gasyna, Zbigniew, Krausz, Elmars, Riesen, Hans
Format: Article
Language:English
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Summary:Persistent spectral hole-burning in the Q-band region is reported for a concentrated (≈ 2 × 10 −2 mol l −1) matrix of copper phthalocyanine in solid Ar at 1.6 K. Hole-burning occurs with a quantum efficiency of ≈ 10 −6 and can be reversed by annealing at ≈ 28 K. Vibrational side holes allow determination of excited-state frequencies. A hole-burning mechanism involving triplet-state charge separation followed by rapid electron back-transfer is proposed. Temperature dependence of the MCD and the difference between MCD spectra taken before and after irradiation indicate that the excited state is split by crystal-field and spin-orbit interactions.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(96)00916-5