The design of a new high-pressure infrared (IR) cell for carrying out picosecond time-resolved infrared (<i>ps</i>-TRIR) spectroscopy in supercritical fluids is described. We have employed thin (2 mm) MgF<sub>2</sub> windows in order to overcome possible undesirable nonlinear optical effects caused by the extremely high peak powers of ultrashort ultraviolet (UV)/visible pulses. The design of our cell allows for the study of systems at pressures of up to 5500 psi at temperatures of up to approximately 50 °C. The MgF<sub>2</sub> windows enable the excitation of samples with both UV and visible light pulses and these windows are transparent across much of the mid-infrared region. We have demonstrated the use of this cell by examining the photochemistry of Fe(CO)<sub>5</sub> in supercritical Kr (<i>sc</i> Kr).

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