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Electronic spectra spectral features

The second spectrum (figure 3b) displays the spectral features of DPP+ radical cation and provides evidence of DPP spontaneous ionization DPB + HZSM-5 -> DPB + HZSM-5 " (eq. 2). The third spectrum (fig. 3c) exhibits a broad band at 425 nm and is assigned to electron-hole pair formation DPB + HZSM-5 " - DPB HZSM-5 + (eq. 3). [Pg.379]

Let IM be the intensity of a peak at mass M, normalized to the highest peak in the spectrum (the base peak with intensity 100%). A spectral feature Xj is a function of one or several peak intensities and is scaled to the range 0-100. Spectral features can be used—eventually together with original peak intensities—to characterize a mass spectrum of a compound. The typical parameters given here are for electron impact mass spectra. [Pg.302]

In an analysis of a molecular spectrum, the primary task is, for purpose of characterisation, to assign each narrow spectral feature to a transition between two molecular states specified with rotational, vibrational and electronic quantum numbers or other indices. Nearly as important as the former, another task is to... [Pg.254]

Analysis of the valence-band spectrum of NiO helped to understand the electronic structure of transition-metal compounds. It is to be noted that th.e crystal-field theory cannot explain the features over the entire valence-band region of NiO. It therefore becomes necessary to explicitly take into account the ligand(02p)-metal (Ni3d) hybridization and the intra-atomic Coulomb interaction, 11, in order to satisfactorily explain the spectral features. This has been done by approximating bulk NiO by a cluster (NiOg) ". The ground-state wave function Tg of this cluster is given by,... [Pg.377]

A Fano profile was originally derived to interpret an asymmetrical spectral feature of autoionizing atoms [12], but it can also be identified in the electric spectrum of some simple molecules, which indirectly or directly dissociate. It has been known that a transition from an electronic ground state to a resonance state in the excited-state PES, formed through a mixing between zero-... [Pg.793]

Up to this point we have considered two central issues involved in interpreting electronic spectra of transition metal complexes—the number and intensities of spectral lines. There is a third important spectral feature, the widths of observed bands, which we have not yet discussed. Consider again the visible spectrum for... [Pg.765]

Figure 2. Excited-state spectral features ofD -CuCl/-. A Energy level diagram showing the ligand-field (d - d) and charge-transfer (CT) optical transitions. The intensity of the transitions is approximated by the thickness of the arrow with the very weak ligand-field transitions represented as a dotted arrow. B Electronic absorption spectrum for D4h-CuCl42 (12). C Schematic of the a and tt bonding modes between the Cu 3dx2 y2 and Cl 3p orbitals. Figure 2. Excited-state spectral features ofD -CuCl/-. A Energy level diagram showing the ligand-field (d - d) and charge-transfer (CT) optical transitions. The intensity of the transitions is approximated by the thickness of the arrow with the very weak ligand-field transitions represented as a dotted arrow. B Electronic absorption spectrum for D4h-CuCl42 (12). C Schematic of the a and tt bonding modes between the Cu 3dx2 y2 and Cl 3p orbitals.

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Electronic Features

Spectral features

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