Spectroscopy background

Kessler, H., Gehrke, M., Griesinger, C., Two-Dimensional NMR Spectroscopy Background and Overview of the Experiments, Angew. Chem. Int. Ed. Engl., 1988, 27,490... 

P.N., Barnett, S.M., and Baumberg,).). (2010) Understanding the surface-enhanced Raman spectroscopy background . Journal of Physical Chemistry C, 114, 7242-7250. 

From Kessler H, Gehrke M, and Griesinger C (1988) Two-dimensional NMR spectroscopy background and overview of the experiments. Angewandte Chemie (IntemaHonal Edition in English) 27 490-536. 

Figure 4. This diagram gives a simple single-peak example of shifted Raman spectroscopy background subtraction...

The nomesonant background prevalent in CARS experiments (discussed above), although much weaker than the signals due to strong Raman modes, can often obscure weaker modes. Another teclmique which can suppress the nonresonant background signal is Raman induced Kerr-efifect spectroscopy or RIKES [96, 97]. 

Physical background. MAS will narrow the inliomogeneously broadened satellite transitions to give a series of sharp sidebands whose intensity envelopes closely follow the static powder pattern so that the quadnipole interaction can be deduced. The work of Samoson [25] gave real impetus to satellite transition spectroscopy by showing that both the second-order quadnipolar linewidths and isotropic shifts are fiinctions of / and Some combinations of / and produce smaller second-order quadnipolar effects on the satellite lines than... 

With this as background we will now discuss spectioscopic techniques mdividu ally NMR IR and UV VIS spectroscopy provide complementaiy mfoimation and all are useful Among them NMR provides the mfoimation that is most duectly related to moleculai stiuctuie and is the one we 11 examine hist... 

M HNO3. The concentration of Cu and Zn in the diluted supernatant is determined by atomic absorption spectroscopy using an air-acetylene flame and external standards. Copper is analyzed at a wavelength of 324.8 nm with a slit width of 0.5 nm, and zinc is analyzed at 213.9 nm with a slit width of 1.0 nm. Background correction is used for zinc. Results are reported as micrograms of Cu or Zn per gram of FFDT. 

Fluorescence Interference. The historical drawback to widespread use of Raman spectroscopy has been the strong fluorescence background exhibited by many materials, even those which are nominally nonfluorescent. This fluorescence often arises from an impurity in the sample, but may be intrinsic to the material being studied. Several methods have proved useflil in reducing this background. One of the simplest is sample purification. 

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