A schematic of the IRRAS instrument currently in use at Rutgers University is shown in Fig. 3.1. While details of design vary among the dozen or so groups around the world utilizing this technique, a minimal set of component requirements is represented in the figure, ttus, a Langmuir trough for containing surface films, a Wilhelmy plate or equivalent device for surface-pressure measurements, and an IR polarizer are all required in addition to a high-end IR instrument. Other useful ancillary equipment includes devices for control of the relative humidity of the environment and the temperature of the subphase. tte Langmuir trough must be sufficiently large so as to provide a sampling area lacking a meniscus. For Teflon troughs, this linear dimension is at least 6 cm.
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