Spectral hole-burning and magnetic circular dichroism of matrix-isolated copper phthalocyanine
✍ Scribed by Cara L. Dunford; Bryce E. Williamson; Paul N. Schatz; Zbigniew Gasyna; Elmars Krausz; Hans Riesen
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 518 KB
- Volume
- 260
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Persistent spectral hole-burning in the Q-band region is reported for a concentrated (= 2 x 10 -2 mol 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.