Observation of large splittings, narrow resonances, and polarization extinction in the high-energy overtone spectra of large molecules. Experimental tests of locality of excitation in bonds

In this paper we report on several new spectral features in the high-energy overtone region of the large molecule in a crystal at ~2 K, in particular, large splittings, narrow resonances, and polarization extinction. The results are used to test the locality of vibrational excitation at high energies (the fifth harmonic of the CH stretch).