This paper describes a new high pressure cell which was designed to work up to a pressure of about 8 kbar. A study of phase transitions of ammonium bromide and ammonium iodide using the infrared (IR) reflection spectra in the range from 1000 cm−1 to 1700 cm−1 was utilized to check the validity of measurements made with this cell. The incident IR radiation entered the pressure cell through a zinc sulphide window. The obtained data agrees very well with the established data for the phase transition of ammonium bromide and iodide.
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