Add time:08/20/2019         Source:sciencedirect.com

In-situ high pressure Raman spectra of crotonic acid have been measured up to 14 GPa, a possible solid–solid phase transition was detected at about 6 GPa from the frequency–pressure relationship. According to the relative intensity changes of typical Raman peaks, the inter-molecular hydrogen bond interactions, as well as molecular structural transformation are concluded. Compared to the linear frequency–pressure relationships, an exponential intensity–pressure relationship was concluded, which was sensitive to inter-molecular interactions under external compression.

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