“…groups) are frozen in different temperature ranges on cooling or at different pressures on squeezing. Different experimental techniques (IR and Raman spectroscopy, − ,− ,,,− ,− ,− picosecond coherent Raman scattering (ps CARS), , terahertz spectroscopy, NMR, − , electron spin echo, pulsed ESR spectroscopy, adiabatic calorimetry, ,,,,,, X-ray diffraction, ,,,,,,− IINS 43,59,82 ) are sensitive to the motions with different relaxation times and can, therefore, detect selectively different types of disorder in the crystals of amino acids. This often leads to confusion and seeming discrepancies in the conclusions on the occurrence of a phase transition based on using different experimental techniques.…”