When electromagnetic radiation in the ultraviolet (UV) or visible region of the spectrum is absorbed by a molecule, π or non‐bonding (n) electrons are promoted into antibonding orbitals. Because the main electron transitions are π→π* transitions, the absorption of energy in the UV or visib...
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á857ñ ULTRAVIOLET-VISIBLE SPECTROSCOPYINTRODUCTIONUltraviolet-visible (UV-Vis) spectra are derived when the interaction between incident radiation and the electron cloud in achromophore results in an electronic transition involving the promotion of one or more of the outer shell or the bonding elec-...
The electronic spectra of vanadyl octaethylporphyrin (VOOEP) and nickel octaethylporphyrin (NiOEP) in different solvents were measured using Cary 50 ultraviolet visible spectrophotometer. Soretband, α band and β band are the main characteristic bands of the two metalloporphyrins. Compared with the...
A light source may be used if the practiceis consistent between the materials under comparison.á857ñ ULTRAVIOLET-VISIBLE SPECTROSCOPYINTRODUCTIONUltraviolet-visible (UV-Vis) spectra are derived when the interaction between incident radiation and the electron cloud in achromophore results in an ...
Spectrometry: ultraviolet and visible spectra.Colloca, Cristina BSosa, Virginia EA.A. Schilt, B. Jaselskis, Ultraviolet and Visible Spectro- photometry, Intersciences Pub., New York, 1964., p. 2943
2021. Research progress on online monitoring technologies of water quality parameters based on ultraviolet-visible spectra. Remote Sensing for Natural Resources, 33(4): 1-9. doi: 10.6046/zrzyyg.2020409 Citation: CHEN Jie, ZHANG Lifu, ZHANG Linshan, ZHANG Hongming, TONG Qingxi, . 2021. Research...
Just as with UV/visiblespectrophotometry, it is possible to obtainIR spectraof microscopic pieces of evidence. Instruments can be obtained that have a microscope attached to the spectrophotometer. Through a light path, the source radiation is channeled through the microscope and the object and then...
Ultraviolet-visible( UV-Vis) absorption spectra were recorded for unveiling the geochemical characteristics of DOM based on specific absorption parameters and fitting models. Through the results of specific absorption parameters,it was suggested that the aromaticity,hydrophobicity and humification degree ...
Near infrared (NIR) spectroscopy of turquoise minerals from Arizona and Senegal with a formula of Cu(Al6–x,Fex)(PO4)4(OH)8.4H2O has been studied and a comparison of their NIR, ultraviolet-visible (UV-vis) and mid-IR spectra made. UV-vis and NIR reflectance spectroscopy is the most ef...