Which IR detector is the best?
Unfortunately, there is not a perfect detector for the entire infrared region. As a consequence, there are a number of factors to consider when choosing an infrared detector for your measurement, including
It is often not possible to optimize all the desired factors in a single detector; some compromises will be needed. For a detailed description of these factors, please refer to "Characteristics and use of infrared detectors." Some of the more commonly used detectors at our beamline are listed below. For a complete listing of the available infrared detectors, please see our detector list.
Our infrared microscopes (Beamlines 1.4.3 and 1.4.4) are equipped with an MCT A detector because this detector provides the best sensitivity and speed over a broad spectral range covering the entire mid-infrared and most of the near-infrared (up to ~11,000 cm-1). One downside to these detectors is that they require liquid nitrogen. The dewars, however, last > 8 hours and liquid nitrogen is readily available at the ALS.
ALS User Proposals