For about 130 years, the Bouguer-Lambert-Beer law has been used as the quantitative basis of absorption spectroscopy. Bouguer established empirically a correlation between pathlength and light absorption in 1729. This correlation was then formulated mathematically by Lambert in 1760 [1] and Beer ...
Ultraviolet-visible (UV-Vis) spectroscopy is a widely used technique in many areas of science ranging from bacterial culturing, drug identification and nucleic acid purity checks and quantitation, to quality control in the beverage industry and chemical research. This article ...
Optical spectroscopy is based on the Bohr-Einstein frequency relationship $$\Delta E = {ext{ }}E_2 - {ext{ }}E_1 = hu \:.$$ (1) This relationship links the discrete atomic or molecular energy states Ei with the frequency v of the electromagnetic radiation. The proportionality constant...
UV-VIS spectroscopy plays an important role in analytical chemistry and has widespread application in chemistry, physics and life sciences. The author has created a detailed and comprehensive reference work on all important aspects of UV-VIS spectroscopy, including investigations on chemical kinetics and...
UV VIS Spectroscopy - The most commonly used instrumental techniques in analytical chemistry , particularly in the life sciences, are possibly UV-visible spectroscopy. In analytical chemistry, UV-VIS spectroscopy is routinely used for the quantitative de
of 10 μm, it has obtained a high electric field E = 107–108V/m that assures the formation of nonthermal plasma at a discharge voltage about 1 kV. The temperature estimation of the microplasma discharge using emission spectroscopy shows high electron and low rotational temperatures. These ...
The reversibility of pH induced assembly, and disassembly also has been confirmed by the absorption spectroscopy (Fig. 4A,B) and size measurements (Fig. 4C). When the solution pH was returned to normal physiological pH (~7.4), the absorption spectrum of AuNPs has returned to its original shap...
Abundances of a range of air pollutants can be inferred from satellite UV-Vis spectroscopy measurements by using the unique absorption signatures of gas species. Here, we implemented several spectral fitting methods to retrieve tropospheric NO2, SO2, and
Here, the active layer for GaAs HEMT was considered; however, this approach is not limited to HEMT devices and can be expanded to any possible set of active layers. Energy dispersive x-ray (EDAX) spectroscopy in Fig. 2d shows the abrupt interfaces between GaAs, Y2O3, and Si. Fig. ...
indicating the high performance of the fabricated broadband photodetector. Fig.3cdisplays the trap density of states (tDOS) obtained by thermal admittance spectroscopy of two different devices48,49. The pure perovskite photodetectors possess a relatively large density of defect states of 3 × 1018...