Vibrational Study of 13C-enriched C60 Crystals
Michael C. Martin, J. Fabian, J. Godard, P. Bernier, J.M. Lambert, and, L. Mihaly (State Univ of New York at Stony Brook, Universite Paris-Sud Orsay,, and Universite des Sciences et Techniques du Languedoc, Montpellier)
TL;DR
This study investigates the vibrational spectra of 13C-enriched C60 crystals, comparing experimental IR spectra with theoretical models to understand isotope effects on vibrational mode activation.
Contribution
The paper provides a combined experimental and semi-empirical theoretical analysis of 13C isotope effects on vibrational modes in C60, ruling out isotope-induced symmetry breaking as the activation mechanism.
Findings
Isotopic activation mechanism is excluded based on comparison.
Experimental and theoretical spectra show no evidence of symmetry breaking effects.
Weak vibrational modes are not caused by 13C isotope-induced symmetry breaking.
Abstract
The infrared (IR) spectrum of solid C60 exhibits many weak vibrational modes. Symmetry breaking due to 13C isotopes provides a possible route for optically activating IR-silent vibrational modes. Experimental spectra and a semi-empirical theory on natural abundance and 13C-enriched single crystals of C60 are presented. By comparing the experimental results with the theoretical results, we exclude this isotopic activation mechanism from the explanation for weakly active fundamentals in the spectra.
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