The Proton Crystal Model

Islands of intensity are observed for the out-of-plane and in-plane bending modes at about 1000 and 1400 cm , respectively, for the overtone 2 x 7 OH at 1850 cm and for the broad stretching mode at 2800 cm. The maxima of intensity for all observed eigenstates are very close to the recoil line for the proton mass, with only one exception for the in-plane bending 8 CO3 at 650 cm . A more quantitative analysis 

As a conclusion for this section, when INS techniques can be fully exploited, as is possible for a rather simple system such as KHCO3, they provide the most detailed view of proton dynamics ever obtained. They emphasize that with optical techniques 

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