Spectrum origin

Holuj, F. 1966. The spin Hamiltonian and intensities of the EPR spectra originating from large zero-field effects on 6S states. Canadian Journal of Physics 44 503-508. 

Fig. 7.2 Explanation of the E. COSY principle. The E. COSY spectrum can be conceived as a superposition of spectra originating from two...

It is important to point out that D. vulgaris hydrogenase contains three multinuclear iron clusters and each cluster may exist in equilibrium between two different oxidation states in each sample. Consequently, the raw Mossbauer spectra are complex, consisting of overlapping spectra originating from different iron sites of these various clusters. For clarity, we present only the deconvoluted spectra of the H cluster. These spectra were prepared by removing the contributions of other iron species from the raw spectra. Details of the analysis are available (Pereira et al. 2001). 

Asimov, I. (1992) The Stars Like Dust. New York Spectra. (Originally published in 1950.) Describes travel in hyperspace. 

Fig. 6A,B, Fluorescence spectra A 11 in a sonicated solution of9 B 12 in an aqueous dispersion of 9, with (a) and without (b) 5 in aqueous phosphate buffer (10 mmol dm" ) at pH8.0 and 20.0 °C. Concentrations in mol dmguests, 1.0 x 10" 9,4.0 x 10" 5,1.0 x 10" The dotted lines refer to background spectra originating from 9 alone (Taken from [37])...

Figure 2. Same as Fig. 1, except spectra originate from the A level. Note the nodes in the progressions, originating from the two internal nodes in the 2 <3 state, near 04 = 12, 18. 

Broad bands in optical absorption and emission spectra originating from one or several closely lying electronic transitions are indications of strong vibronic coupling. In the case when the vibrational structure is resolved into a progression of individual bands, a vibronic analysis can be carried out which compares a theoretical line shape function with the intensity profile measured in the... 

Figure 4.10 Polarized absorption spectra of ruby (from Bums, 1984). The ruby formula is (AIq 99gCr0 002)203, and the spectra originate from crystal field transitions within Cr3+ replacing Al3+ ions in trigonally distorted octahedral sites in the trigonal corundum structure. Consequently, the spectra differ slightly for light polarized (a) parallel (Ellc) and (b) perpendicular (E c) to the c crystallographic axis. The group theoretical assignments of the absorption bands are also indicated. [Reproduced from Chemistry in Britain, 1984, p. 1004]...

Infrared spectra originate in the transitions between two vibrational levels in a single electronic... 

Raman spectra originate in the electronic polarization caused by UV or visible light. 

In lanthanide elements, the 5s and 5p shells are on the outside of the 4f shell. The 5s and 5p electrons are shielded, any force field (the crystal field or coordinating field in crystals or complexes) of the surrounding elements in complexes have little effect on the electrons in the 4f shell of the lanthanide elements. Therefore, the absorption spectra of lanthanide compounds are line-like spectra similar to those of free ions. This is different from the absorption spectra of d-block compounds. In d-block compounds, spectra originate from 3d 3d transitions. The nd shell is on the outside of the atoms so no shielding effect exists. Therefore, the 3d electrons are easily affected by crystal or coordinating fields. As a result, d-block elements show different absorption spectra in different compounds. Because of a shift in the spectrum line in the d-block, absorption spectra change from line spectra in free ions to band spectra in compounds. 

Ref. 38, 14N spectra, originally referred to either internal KNO, (for aqueous solutions, + 3-5 ppm from neat CH,N02, Table VII) or CH3NO, (recalculated according to Table VII) differential saturation technique and lineshape analysis (63). 

Ref. 101, 14N spectra, originally referred to internal CH,NO, recalculated according to Table VII. 

Ref. 76, 15N natural-abundance spectra, originally referred to 10m HNO, +4-4 ppm from neat CH,N02, Table VII. 

Ref. 103, l4N spectra, originally referred to saturated aqueous NaNO, +3-5 ppm from neat 0H3NO2, by sample replacement method. d Ref. 104,, N spectra of compound labelled at N-terminal and C—N atoms. 

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