✦ LIBER ✦

Novel effects in the resonance raman spectra of metalloporphyrins

✍ Scribed by Benjamin Scharf

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 456 KB
Volume: 102
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(83)87389-8

No coin nor oath required. For personal study only.

✦ Synopsis

Novel features in the resonance Raman spectra of metalloporphyrins are predicted to ensue via the recently revealed crossquadralic nuclear potential terms involving modes of different symmetry_ Such terms were shown to prevail in the doubly degenerate excited electronic states corresponding to the visible and UV bands of these molecular systems.

I _ Introduction

The existence of non-vanishing cross-quadratic vibronic terms involving modes of different symmetry in the nuclear potential of degenerate electronic states of non-linear molecules and their importance have been recently recognized and discussed in detail by the author [l--3] *_ It has been shown that in electronic transitions involving degenerate electronic states the following spectroscopic effects may result via these cross-quadratic terms: (a) Prominent vibronic progressions of potentially Jahn-Teller (JT) active modes may arise even in the absence of JT distor-

📜 SIMILAR VOLUMES

Interference between intra- and inter-ma

Interference between intra- and inter-manifold couplings in resonance Raman spectra of metalloporphyrins

✍ M.Z. Zgierski; J.A. Shelnutt; M. Pawlikowski 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 386 KB

Anomalous intensity ratios in the excitation protides of vibronicaiIy active fundamentals in the Q-band of porphyrins are shown to be due to interference between intramanifold (J&n-Teller) coupling with the Q and B bands, intermanifold (Herzberg-Teller) coupling between the Q and B bands. and electr

The effect of dimerization on the resona

The effect of dimerization on the resonance raman excitation profiles of metalloporphyrins

✍ M.Z. Zgierski 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 610 KB

On the molecular origin of the anomalous

On the molecular origin of the anomalous polarization in the resonance raman of metalloporphyrins

✍ Arieh Warshel 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 619 KB

A direct method for evaluation of resonance Raman spectra of cofljugated molecules is applied to the study of the anomalous polarization effect in metalIoporphyrins. The method provides a simpfe explanation for the inverse polarization effect. The quantitative nature of the method allows one to stud

Resonance effect in the ultraviolet rama

Resonance effect in the ultraviolet raman spectra of styrenes: nature of the photoreactive states

✍ G.N.R. Tripathi 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 417 KB

Raman scattertng spectra of styrene and fluorostyrene are studred at e\cuatron wavelengths 305 and 337 nm in the ultravrolet and 577.8 nm III the vtsrble regton. The resonance effect in some of the vtbratrons is remarkably large. The results obtamed are dtxussed m relatron to the lowest exrted smgle

On the Calculation of Resonance Raman Sp

On the Calculation of Resonance Raman Spectra

✍ R. Islampour; M. Hayashi; S. H. Lin 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 434 KB 👁 2 views

A general formalism for resonance Raman scattering is presented which treats both linear and quadratic electronphoton interactions. The time correlation functions which are involved in resonance Raman scattering both from a single vibronic state and from the initially distributed vibronic states are

Resonance Raman spectra of C70 in benzen

Resonance Raman spectra of C70 in benzene

✍ Sean H. Gallagher; Robert S. Armstrong; Peter A. Lay; Christopher A. Reed 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 224 KB

Of the 53 Raman active bands of A 1, E' 2, and E~ symmetries, 25 are observed in resonance Raman spectra of C7o in benzene; excitation responses from 457.9 to 514.5 nm show that A-term, B-term, and probably D-term scattering mechanisms operate and assist in the assignment of the electronic spectrum.