Ultraviolet-Visible-Near Infrared

X rays I Vacuum ultraviolet Visible Near infrared Infrared i ) V / 1... 

Lambda 2 Ultraviolet-visible double-beam spectrophotometer Lambda 3 Ultraviolet-visible double-beam spectrophotometer Lambda 5 and Lambda 7 Ultraviolet visible spectrophotometers Lambda 9 Ultraviolet visible—near infrared spectrophotometer Lambda Array 3430 Spectrophotometer... 

F.C. Jentoft, Ultraviolet-Visible-Near Infrared Spectroscopy in Catalysis Theory, Experiment, Analysis, and Application Under Reaction Conditions, Adv. CataL, 52, 129-211 (2009). 

Commonly used units are reciprocal second (s l or Hz) for frequency nanometre nm, I nm = 10 m) for wavelength IK = civ. where c is the speed of light) and ioule ( ) far energy. Because energy is frequently dealt with on a mole basis, the unit encountered is kl mol-1. Table 1.1 shows the relationship between these units for selected numerical values in the ultraviolet/visible/near-infrared range. 

Ultraviolet-Visible-Near Infrared (UV-vis-NIR) Spectroscopy in Catalysis... 

Volumes 50 and 51 of the Advances, published in 2006 and 2007, respectively, were the first of a set of three focused on the physical characterization of solid catalysts in the functioning state. This volume completes the set. The six chapters presented here are largely focused on the determination of structures and electronic properties of components and surfaces of solid catalysts. The first chapter is devoted to photoluminescense spectroscopy it is followed by chapters on Raman spectroscopy ultraviolet-visible-near infrared (UV-vis-NIR) spectroscopy X-ray photoelectron spectroscopy X-ray diffraction and X-ray absorption spectroscopy. 

UV-vis(-NIR) Ultraviolet-visible(-near-infrared) spectroscopy Electron and charge transfer transitions... 

Reflectance spectra from 2 meV to 6 eV were recorded as reported previously [29]. The high energy (0.5-6 eV) reflectance was recorded using a Perkin-Elmer X.-19 ultraviolet/visible/near-infrared (UV/Vis/NlR) spectrometer equipped with a Perkin-Elmer RSA-PE-90 reflectance accessory based on the Labsphere DRTA-9a integrating sphere. The low energy (2 meV-1.2 eV) reflectance measurements... 

Y. Xia, J. M. Wiesinger, A. G. MacDiarmid, A. J. Epstein, Camphorsulfonic acid fully doped polyaniline emeraldine salt conformations in different solvents studied by an ultraviolet/visible/near-infrared spectroscopic method, Chemistry of Materials 1995, 7, 443... 

Martelo-Vidal, M. J., Dommguez-Agis, R, and Vazquez, M. 2013. Ultraviolet/visible/ near-infrared spectral analysis and chemometric tools for the discrimination of wines between subzones inside a controlled designation of origin A case study of Rias Baixas. Aust. J. Grape Wine R. 19 62-67. 

Figure 18-6 (a) Absorption spectrum of KMnO at four different concentrations, (b) Peak absorbance at 555 nm is proportional to concentration from 0.6 xM to 3 mM. The Cary 5000 ultraviolet-visible-near infrared spectrophotometer used for this work has a wider operating range than many instruments. It is difficult to measure absorbance accurately above 2 or below 0.01. [From A. R. Hind, Am. Lab., December 2002, p. 32. Courtesy Varian, Inc., Palo Alto, CA.]... 

Figure 2a shows the ultraviolet-visible-near infrared spectrum of an —2% solution of as-synthesized emeraldine base in A -methyl-2-pyrrolidone (NMP) [16]. The two absorption peaks at 328 and 635 nm have been assigned as the tt-tt and exciton transitions, respectively. The ratio of the intensity of the exciton transition to that of the TT-TT transition is 0.886. This ratio and the position of the exciton peak are very sensitive to the oxidation state of the polyaniline sample. Thin films of EB spin coated on quartz plates from the NMP solution give similar spectra with the positions of the two absorption peaks at 329 and 623 nm, respectively. The ratio of these two peaks also changes to 0.68, an indication of conformational change during the evaporation of the solvent. 

Ultraviolet, visible, near-infrared, and mid-range infrared spectroscopies all work as per Beer s law. This has been proven during the past 100 or so years in several million assays. Therefore, distinguish between a case in which the procedure works even if a particular instrument does not and one in which the procedure or technique does not work. [The best hitters in baseball do not get a hit 70% of their times at bat, but there are no cries for bats to be abandoned because they don t work ]... 

Figure 2.4 Hydrogen atom energy levels and transitions. The Lyman, Balmer, Ritz-Paschen, and Brackett series occur in the vacuum ultraviolet, visible, near-infrared, and infrared regions of the electromagnetic spectrum, respectively.

Jentof FC (2009) Ultraviolet-visible-near infrared spectroscopy in catalysis theory, experiment, analysis and application under reaction conditions. In Gates BC, Kndzinger H (eds) Advances in catalysis, vol 52. Academic Press, Amsterdam... 

For small prisms, [/i = 10 nm) the absorption and scattering spectra present only two peaks these features could be attributed to the in-plane dipole resonance (longer wavelengths) and to the inplane quadrupole resonance [44]. By increasing the side of the triangle, a clear red-shift of these two peaks appears (see Fig. 3.8) and this is also confirmed experimentally by ultraviolet-visible-near-infrared spectroscopy measurements [44]. This effect can be understood by considering the fact that by enlarging the area of... 

Although this book is concerned only with the infrared region of the electromagnetic spectrum, it will be useful to look at the entire spectrum normally used in analysis. The spectrum is divided into several regions, each of which is used for a different purpose, and each of which furnishes a different type of information. These are the X-ray, ultraviolet, visible, near-infrared, infrared, far-infrared, and microwave regions. This division of the spectrum is arbitrary, and the boundaries... 

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