FMIR frustrated multiple internal

FMIR Frustrated multiple internal reflectance (spectroscopy)... 

ATR units were originally built for a single reflection, but were later modified for several reflections. Currently these units are available for multireflections, and are usually called FMIR (frustrated multiple internal reflection). 

Literature values of the contact angles for various liquids on four of the five polymers used in this work are given in Table I. These values may be compared with those for our unirradiated polymers. In the case of polystyrene, exhaustive methanol or n-heptane extraction followed by drying did not result in a change in contact angles, and residual extractant could not be observed by means of frustrated multiple internal reflectance (FMIR) spectra of the films. 

ATR. Attenuated total reflectance and its extension, frustrated multiple internal reflectance (FMIR), are excellent techniques for the analysis of surfaces. In these techniques the sample does not have to be reflecting, as the reflection is done by the crystal-sample interface (Section 3.8). 

Attenuated total reflection (ATR) has grown into the most widely practiced technique in infrared spectrometry. The reasons for this are fairly straightforward the technique requires little or no sample preparation, and consistent results can be obtained with relatively little care or expertise. The technique is not foolproof, but it can be very forgiving. ATR spectrometry is known by a number of alternative names, for example, multiple internal reflection (MIR), which is not to be confused with mid-infrared, frustrated multiple internal reflection (FMIR), evanescent wave spectrometry (EWS), frustrated total internal reflection (FTIR), which is not the same as Fourier transform infrared (FT-IR) spectrometry, and internal reflection spectrometry (IRS), but IRS is better known, at least in the United States, as the Internal Revenue Service. 

The internal reflectance technique has been available in several different forms for many years (18, 19). It is also known as ATR and multiple internal reflectance or frustrated MIR (MIR/FMIR). 

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