The PIKE Technologies JetStream is an ATR accessory optimized for analysis of liquids in static or dynamic modes under ambient or variable pressure conditions. The accessory design features a cylindrical ATR crystal encased in a heavy-duty stainless steel body. The crystal’s geometry has been carefully chosen to maximize its performance. The crystal generates 12 reflections along its body with throughput sufficient to perform high sensitivity measurements. The accessory’s compact design employs a pair of transfer optics, directing the infrared beam to one end of the crystal. A similar pair of optics directs the beam exiting the accessory to the spectrometer’s detector. The sample enters and exits the measurement chamber via Swagelok ports and completely surrounds the crystal. This assures efficient sampling and good reproducibly. The accessory is available for all brands of FTIR spectrometers.