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Absorption at the dipole-forbidden optical gap of crystalline C60

✍ Scribed by H. Schlaich; M. Muccini; J. Feldmann; H. Bässler; E.O. Göbel; R. Zamboni; C. Taliani; J. Erxmeyer; A. Weidinger

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
641 KB
Volume
236
Category
Article
ISSN
0009-2614

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✦ Synopsis

We report detailed optical studies of crystalline C6o applying several optical spectroscopic techniques such as absorption, photoluminescence, and one-photon and two-photon photoluminescence excitation spectroscopy. The energetically lowest purely electronic 0'-0 transition is found at 1.846 eV. At low temperatures, the absorption spectrum systematically exhibits doublet features with the same energetic splitting as observed for the low-temperature fluorescence spectrum. These transition pairs either represent two distinct vibration-induced transitions or only one vibration-induced transition and the splitting is then due to the two distinct alignments of neighbouring C6o molecules (merohedral disorder). Temperature-dependent absorption measurements show that the two molecular alignments might indeed be responsible for the double resonances.

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✍ D.J. van den Heuvel; I.Y. Chan; E.J.J. Groenen; M. Matsushita; J. Schmidt; G. Me 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 518 KB

Well-resolved fluorescence spectra are reported for single crystals of C6o at 1.2 K. The fluorescence is found to be composed of two contributions. Fluorescence-microwave double-resonance experiments indicate that the dominant component originates from deep X-traps that consist of pairs of C60 molec