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Theory of Resonance Raman Scattering by Degenerate Modes Due to Renner-teller Interactionin Porphyrins by Willem Siebrand; Marek Z. Zgierski is a Physics and Astronomy article available to read on EtoBox.

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Resonance Raman spectra and excitation profiles associated with Renner-Teller coupIing in square molecules are ar&ysed theoretically and an experiment is proposed to warch for this effect in metalioporphyrins-One of the most successful applications of resonance Raman spectroscopy to date has been the unraveling of vibronic coupling patterns in metatloporphyrins [I -6]\_ The basic Dab symmetry of these moIecuIes, sometimes weakly broken by substituents, leads to (pseudo-) Jahn-Teller coupling within the manifolds of (pseudo-) degenerate states-Two such (E-type) states are known to give rise to prominent absorption bands, nameIy 3 weak, low-energy "Q" band and a strong higher-energy "B" (or Soret) band-Since these states derive from the same pair of degenerate z-orbit&, they are susceptible to Hetzberg-TeIIer coupling, a mechanism which transfers transition moment from the B to the Q band. As a resuit the Q band shows a broad feature (~3 band) which is bmicaIIy z superposition of induced O-l bands of nontotaiIy symmetric modes\_ Such Herzberg-Teileractive modes can belong to the representations al, aI, bt and b2\_ The last two \_representations are ako Mm -Teller active. The correspo

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Author

Willem Siebrand; Marek Z. Zgierski

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0009-2614)

Published

1979

Language

EN

Field

Physics and Astronomy (Physical Sciences)