The short path-length absorption cell (SPAC) operated by the Rutherford Appleton Laboratory (RAL) Molecular Spectroscopy Facility (MSF) is a stainless-steel vessel containing multi-pass reflective optics for broadband high-resolution spectroscopy at optical path-lengths from 1.2 metres to over 22 m. The cell temperature, logged automatically to computer, can be controlled at any point between 77 and 470 K. A state-of-the art high-vacuum system ensures the SPAC and all external optical paths can be fully evacuated.
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The SPAC is configured with dedicated gas handling, temperature, and pressure measurement systems for accurately filling the cell and remotely monitoring the sample conditions throughout the course of measurements. The SPAC is a White-type multi reflection cells in which high reflectance mirrors are used to fold paths of up to 22 metres into compact absorption systems. It can be cooled to 77 K or heated to 470 K and used at pressures up to 5 bar. The cell can be connected to the very high-resolution Bruker spectrometer by using evacuated paths.