5 Terms
Contributors in Spectroscopy
Spectroscopy
mirror displacement
Chemistry; Spectroscopy
The distance that the mirror in an interferometer has moved from zero path difference.
jacquinot advantage
Chemistry; Spectroscopy
This is the throughput advantage of FT-IRs over traditional spectrometers that require a slit aperture. The advantage varies as wavenumber and depends on resolution (because of slit width changes). ...
jacquinot
Chemistry; Spectroscopy
An aperture placed in the beam to restrict the divergence to the maximum compatible with the selected resolution. When choosing lower resolution you can improve the S/N by opening the stop. Note that ...
interferogram
Chemistry; Spectroscopy
A plot of infrared detector response versus optical path difference. The fundamental measurement obtained by an FT-IR is an interferogram. Interferograms are Fourier transformed to give infrared ...
fourier transform
Chemistry; Spectroscopy
Calculation performed on an interferogram to turn it into an infrared spectrum.
felgett (multiplex) advantage
Chemistry; Spectroscopy
An advantage of FT-IR instrument compared to scanning/single channel dispersive instruments. It is based on the fact that in an FT-IR all the wavenumbers of light are detected at once.
apodization functions
Chemistry; Spectroscopy
Functions used to multiply an interferogram to reduce the amount of sidelobes in a spectrum. Different types of apodization functions include boxcar, triangle, Beer-Norton, Hanning, and Bessel. The ...
