NIR: Overtones and Combination Bands
NIR absorption arises from overtones and combination bands of molecular vibrations, enabling non-destructive chemical analysis through intact packaging and vessels.
기본원리·개념
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Absorbance vs. Transmittance
Absorbance and transmittance are two ways to express how much light a sample absorbs, linked by a simple logarithmic relationship.
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What Is Stray Light and Why It Matters
Stray light is out-of-band radiation reaching the detector and is the dominant source of error at high absorbance in UV-Vis spectrophotometers.
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How Raman Scattering Works
Raman scattering produces wavelength-shifted photons that reveal molecular bond vibrations, providing a chemical fingerprint without sample preparation.
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How UV-Vis Spectroscopy Works
Ultraviolet–visible spectroscopy measures how much light a sample absorbs at each wavelength, revealing concentration, purity, and molecular information.
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What Is Wavelength?
Wavelength is the distance between successive peaks of a light wave. It determines a photon’s energy and underpins every spectroscopic measurement.
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The Beer–Lambert Law Explained
The Beer–Lambert law links absorbance to concentration, making quantitative analysis possible. Here is what it says and where it holds.