Neutron and Infrared Spectra of HCrO2 and DCrO2

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Abstract
The vibrational spectra of HCrO2 and DCrO2 have been investigated by the energy-gain scattering of cold neutrons, and by infrared absorption spectra from 4000–30 cm−1. The infrared measurements are in agreement with previous results above 300 cm−1. In addition, no absorptions are observed between 300 and 30 cm−1, a region not covered in previous measurements. These results appear to support previous evidence for asymmetric hydrogen bonds in DCrO2 and essentially symmetric bonds in HCrO2. The neutron spectra exhibit a number of maxima, including a band peaked at about 225 cm−1 in HCrO2 (and a less intense peak around 180 cm−1 in DCrO2), probably due to low-frequency optic lattice modes. A comparison of the neutron and infrared results appears to raise some uncertainty concerning the assumption of symmetric hydrogen bonds in HCrO2.