Horizontal attenuated total reflectance HATR

A method of horizontal attenuated total reflectance (HATR) by Fourier transform infrared spectroscopy (FTIR) is considered more useful for infrared spectroscopic analysis of leather samples. By this method, the sample is simply put on the flat plate of ZnSe crystal or KRS-5 crystal of the HATR accessory. The Fourier transformation of the interferogram is converted by the computer into a plot of absorption against wave number that resembles the usual IR spectrum (William and Fleming, 1998). 

The second sample appeared to be black sooty metallic shavings. Following solvent extractions of this material with xylene and Freon, the solvents were evaporated, and the residues were analyzed by FTIR spectrometry. Because chlorinated solvents attack the epoxy that secures the zinc selenide crystal to the horizontal attenuated total reflectance (HATR) boat. Freon was air dried from the residue. The residue was resolvated in acetone for mounting purposes. 

Use of a horizontal attenuated total reflectance (HATR) accessory detection range = 0.3 M to 1.0 M... 

Figure 15.7. Horizontal attenuated total reflection (HATR) accessory with a trapezoidal internal reflection element. (Courtesy of PIKE Technologies.)...

If the sample is placed in good contact with the surface of an optical device of high refractive index (such as a prism of KRS-5) and illuminated through the prism by IR, the beam passes into the layers in contact and is attenuated before being totally internally reflected by the system, as shown in Figure 5(b). This is called attenuated total reflectance or ATR. If the beam interacts several times, then we have multiple internal reflectance (MIR) and if the surface is horizontal, which is an advantage in setting up the sample, then it is horizontal attenuated total reflectance (HATR). 

HATR Horizontal attenuated total reflectance infrared spertroscopy... 

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