8 Terms
Contributors in Spectroscopy
Spectroscopy
phase correction
Chemistry; Spectroscopy
A software procedure to compensate for not taking a data point exactly at ZOPD, and for frequency dependent variations caused by the beam splitter and signal amplification. The Mertz and Forman ...
optical path difference
Chemistry; Spectroscopy
The difference in optical distance that two light beams travel in an interferometer.
optical distance
Chemistry; Spectroscopy
Physical distance multiplied by the index of refraction of the medium.
nyquist frequency
Chemistry; Spectroscopy
A term widely used in information theory, but here applies to the highest frequency, shortest wavelength, that can be identified in an interferogram. It is the one for which there are exactly two ...
normalized
Chemistry; Spectroscopy
The process of dividing all the absorbance values in a spectrum by the largest absorbance value. This resets the Y axis scale from 0 to 1.
100% line
Chemistry; Spectroscopy
Calculated by ratioing two background spectra taken under identical conditions. Ideally, the result is a flat line at 100% transmittance.
dispersive
Chemistry; Spectroscopy
Type of spectrometer where radiation is split by a diffraction grating, prism, or other device into discrete wavelengths. Pre-dispersive is where the process described above is performed prior to ...
