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  2. Ultraviolet–visible spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet–visible...

    A UV-Vis spectrophotometer is an analytical instrument that measures the amount of ultraviolet (UV) and visible light that is absorbed by a sample. It is a widely used technique in chemistry, biochemistry, and other fields, to identify and quantify compounds in a variety of samples.

  3. Spectrophotometry - Wikipedia

    en.wikipedia.org/wiki/Spectrophotometry

    Ultraviolet-visible (UV-vis) spectroscopy involves energy levels that excite electronic transitions. Absorption of UV-vis light excites molecules that are in ground-states to their excited-states. [5] Visible region 400–700 nm spectrophotometry is used extensively in colorimetry science. It is a known fact that it operates best at the range ...

  4. UV detectors - Wikipedia

    en.wikipedia.org/wiki/UV_detectors

    The vast majority of liquid chromatographic systems are equipped with ultraviolet (UV) absorption detectors. The most common UV-Vis detectors used are variable wavelength detectors (VWD), photo diode array detectors (PDA), and diode array detectors (DAD). [4] Variable wavelength detectors decide in advance which wavelength is needed for the ...

  5. Ultraviolet–visible spectroscopy of stereoisomers - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet–visible...

    Ultraviolet–visible spectroscopy (UVvis) can distinguish between enantiomers by showing a distinct Cotton effect for each isomer. UVvis spectroscopy sees only chromophores, so other molecules must be prepared for analysis by chemical addition of a chromophore such as anthracene.

  6. DU spectrophotometer - Wikipedia

    en.wikipedia.org/wiki/DU_spectrophotometer

    DU Spectrophotometer, National Technical Laboratories, 1947. The DU spectrophotometer or Beckman DU, introduced in 1941, was the first commercially viable scientific instrument for measuring the amount of ultraviolet light absorbed by a substance.

  7. UV-Vis absorption spectroelectrochemistry - Wikipedia

    en.wikipedia.org/wiki/UV-Vis_absorption_spectro...

    UV-Vis absorption SEC is a recent technique that is continuously evolving. However, many advantages have been observed over other techniques. However, many advantages have been observed over other techniques.

  8. Spectronic 20 - Wikipedia

    en.wikipedia.org/wiki/Spectronic_20

    The Spectronic 20 is a brand of single-beam spectrophotometer, designed to operate in the visible spectrum [1] across a wavelength range of 340 nm to 950 nm, with a spectral bandpass of 20 nm. [ 2 ] [ 3 ] It is designed for quantitative absorption measurement at single wavelengths. [ 1 ]

  9. UV-visible spectroscopy - Wikipedia

    en.wikipedia.org/?title=UV-visible_spectroscopy&...

    This page was last edited on 26 June 2010, at 19:00 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...