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Chemistry

A branch of physical science that is concerned with the study of matter and energy and how they interact.

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Chemistry > Spectroscopy

spectral subtraction
Chemistry; Spectroscopy

A spectral manipulation technique where the absorbances of a reference spectrum are subtracted from the absorbances of a sample spectrum. The idea is to remove the bands due to ...

wavelength
Chemistry; Spectroscopy

Distance between adjacent crests or troughs of a light wave.

transmission sampling
Chemistry; Spectroscopy

A sampling method where the infrared beam passes through the sample before it is detected. Samples are typically diluted or flattened to adjust the absorbance values to a ...

smoothing
Chemistry; Spectroscopy

A spectral manipulation technique used to reduce the amount of noise in a spectrum. It works by calculating the average absorbance (or transmittance) of a group of data points ...

single beam spectrum
Chemistry; Spectroscopy

The spectrum that is obtained after Fourier transforming an interferogram. Single beam spectra contain features due to the instrument, the environment, and the sample.

sidelobes
Chemistry; Spectroscopy

Spectral features that appear to the sides of an absorbance band as undulations in the baseline. Sidelobes are caused by having to truncate an interferogram, as a result of finite ...

resolution
Chemistry; Spectroscopy

A measure of how well an IR spectrometer can distinguish spectral features that are close together. For instance, if two features are 4 cm-1 apart and can be discerned easily, the ...

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