Fingerprint neutralizer

The formation of coordinated phenoxyls in the monocations and dications, [Fe(L )]+ and [Fe(L )]2+, is clearly demonstrated by their electronic spectra (142). Fig. 23 displays the spectra of [Fem(LBuMet)]°, [Fe(LBuMet )]+, and [Fem(LBuMet )]2+. Since the spectrum of the neutral tris(phenolato)iron(III) species shows an absorption minimum at -400 nm it is significant that the monocation and dication both display a new intense asymmetric maximum in this region. This intense maximum is the fingerprint of phenoxyl radicals. It is also remarkable that this maximum doubles in intensity on going from the monocation to the dication. On increasing the oxidation level stepwise, the phenolate-to-iron CT band experiences a batho-chromic shift from 513 nm in the neutral species to 562 nm in the monocation and... 

Vibration spectroscopy is also able to measure the concentration of ion radicals (by estimation of the band intensities). Moreover, the IR intensities of some bands in the fingerprint region for organic ion radicals may be much larger than the intensities of the bands for the neutral parent molecules. The examples are polycyclic aromatic hydrocarbons or linear polyenes and their ion radicals. The vibration patterns of the intensity-carrying modes are closely related to the electronic structure of the ion radicals (Torii et al. 1999 and references therein). 

As a consequence of the collective motion of the neutral system across the homogeneous magnetic field, a motional Stark term with a constant electric field arises. This Stark term inherently couples the center of mass and internal degrees of freedom and hence any change of the internal dynamics leaves its fingerprints on the dynamics of the center of mass. In particular the transition from regularity to chaos in the classical dynamics of the internal motion is accompanied in the center of mass motion by a transition from bounded oscillations to an unbounded diffusional motion. Since these observations are based on classical dynamics, it is a priori not clear whether the observed classical diffusion will survive quantization. From both the theoretical as well as experimental point of view a challenging question is therefore whether quantum interference effects will lead to a suppression of the diffusional motion, i.e. to quantum localization, or not. 

Ultraviolet photoelectron spectroscopy (UPS) of anionic C provides information on the electron affinity (EA), and electronic and vibrational structures of the corresponding neutral species. The size dependence of EAs and the vibrational fingerprints are useful to distinguish isomers when combined with mass spectrometry. In 1988 Yang et al. reported the first experimental indication of the presence of monocyclic carbon clusters C in laser vaporization of graphite in helium gas [17]. For clusters C ... 

---