Abstract: A gas sample collection device and method for cold trapping individual gas bands from a gas source that may include a chromatographic separation and for spectrographically analyzing the individual gas bands. The device includes a vacuum chamber containing a rotatably supported highly thermally conductive transmissive substrate having a highly thermally conductive support axle and at least one transmissive surface for holding a sample deposited thereon. A gas inlet is provided for depositing a mixture of sample and matrix material on the transmissive surface which is maintained at a sufficiently low temperature to cause solidification of the gas. A first set of optical elements directs an incident beam of electromagnetic analytical radiation from a source onto the solidified deposit, while a second set of optical elements directs the portion of incident beam transmitted through the deposit and substrate to a detector that is sensitive to the spectral wavelengths being investigated.

Abstract: A thermogravimetric analysis flow cell interface unit has an elongated tubular cell body, glass inlet and outlet transfer lines integrally connected to the cell body for flowing a gas therethrough, a window element for allowing passage of an infrared radiation beam into and out of the cell body, and a mirror element for reflecting the radiation beam back through the cell body. The mirror element and the window element are assembled to the cell body in such a manner that the entire unit may be quickly disassembled and reassembled for easy cleaning and replacement. The flow cell assembly is adapted to interface a thermogravimetric analyzer and an infrared spectrometer.

Abstract: An interchangeable beam splitter holder includes a retainer which holds the beam splitter, and a front door and rear door which are both hingedly connected to the retainer. The doors are movable between a closed position, in which the doors substantially cover the beam splitter, and an open position, in which the doors are pivoted upwardly so that the beam splitter is exposed. The beam splitter holder also has three adjusting screws with ends which are adapted to abut against pivot points in the interferometer to thereby align the beam splitter. The beam splitter holder also has three spring plungers which abut against surfaces within the interferometer to push the ends of the adjusting screws against the three pivot points in the interferometer.