Electronic absorption spectroscopy EAS

A discussion on the main spectroscopic techniques used in mineralogy and materials science is beyond the scope of this chapter. Several treatises and scientific papers dealing with this topic are already available. On the other hand, a thorough understanding of the local phenomena occurring when chromium is incorporated into the octahedral site of a perovskite structure, and, consequently, the know-how of deriving chromium-oxygen local distances is an essential requirement For this reason, in this section, it will be briefly explained how to obtain local bond distances by means of the electronic absorption spectroscopy (EAS), which is one of the most common and well-documented spectroscopic techniques in mineral sciences. [Pg.269]

The principal experimental techniques to characterize the LCP radical cations have been photoelectron spectroscopy (PES) and electron absorption (EA) in matrices [142-150]. The production of radicals in matrices is a slow process and hence EA probes the electronic structure of the chromophore at the equilibrium geometry of the radical ion. In PES the chromophore has no time to relax. However, even ionization results in a remarkable attenuation of the bond-length alternation in comparison with... [Pg.284]

ESCA electron spectroscopy for chemical analysis (X-ray photoelectron spectroscopy) ESI electrospray ionization ET-AAS (Also denoted GFAAS, EAAS, EA-AAS, ETAAS, ETA-AAS) electrothermal atomization atomic absorption spectrometry ETA-CFS electrothermal atomization -coherent forward scattering (atomic magneto-optic rotation) spectrometry ETAES electrothermal atomization atomic emission spectrometry ETAES electrothermal atomization atomic fluorescence spectrometry ETA-LEI electrothermal atomization -laser enhanced ionization spectrometry... [Pg.1682]