Polarized Raman spectra—I. Selection rules

Ting, Chen-Hanson

doi:10.1016/0584-8539(68)80138-2

Cited by 49 publications

(22 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the frame of the ECC theory this issue has been addressed according to a perturbative approach [3,32], following the Albrecht's theory [33] and models derived from it [34,35]. From the analysis of the expression of the Raman polarizability tensor it results that the leading term involves the first strongly dipole allowed excited state (with large character of HOMO-LUMO oneelectron transition), showing an equilibrium molecular geometry displaced along the Z coordinate.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the electronic structure of polyconjugated organic molecules by geometry relaxation: A discussion based on local Raman parameters

Castiglioni

Milani

Fazzi

et al. 2011

Journal of Molecular Structure

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Modulation of the electronic structure of polyconjugated organic molecules by geometry relaxation: A discussion based on local Raman parameters

Castiglioni

Milani

Fazzi

et al. 2011

Journal of Molecular Structure

View full text Add to dashboard Cite

“…Several theoretical treatments of Raman scattering intensity have dealt with the scattering of overtones. [2][3][4][5][6][7][8][9] The molecular polarizability, which is treated as a sum over all vibronic states in the dispersion theory of the Raman effect, is approximated for excitation in the preresonance region by a series expansion in an energy quotient. While several workers have examined the role of some of the leading terms in this e x p a n~i o n ,~~'~ here we consider all terms in the pdarizability expansion consistent to second order in nuclear displacements.…”

Section: Introducilonmentioning

confidence: 99%

Preresonance Raman scattering of overtones: The scattering of two overtones of benzene in the ultraviolet

Ziegler

Albrecht

1979

J Raman Spectroscopy

View full text Add to dashboard Cite

The Raman scattering of two vibrational overtones of benzene is found to undergo strong preresonance enhancement as the excitation frequency approaches the state, the lowest lying, forbidden electronic transition at 265 am. These preresonance active modes are the first overtone of the 606 cm-l eZS fundamental, which is responsible for the vibronidy induced 'Bzu intensity, and the first overtone of the 848cm-'el, fundamental, an out-of-plane C-H bending mode. In order to treat this overtone preresonance Raman behavior theoretically, the molecular polarizability is consistently expanded to second order in nuclear displacements, and thus we consider all preresonance contributions of this order. The leading contributions of strictly dipoleforbidden electronic transitions to fhe scattering cross-section of overtones are exposed. Within this theoretical context it is seen how scattering cross-section for each of these resonance active overtones is derived from different sources. The preresonance scattering of the 606 cm-' overtone results from the vibronic activity of this fundamental in the 'BZU transition. On the other hand, the 848crn-' overtone derives its lB2, resonance activity from the change in its fundamental frequency (to 585 cm-') in this excited electronic state. Furthermore, the 848 an-' overtone activity is built upon significant background preresonance contributions from other higher lying electronic transitions.

show abstract

“…For every observed Raman line, there must be one or more absorption bands responsible for its appearance. If a Raman line ( j ) is assumed to be caused only by one rabsorption band (n), then its intensity is given [6,7] in an approximation as where C is a constant independent of j (but it depends upon n). Let us suppose here that the absorption band n corresponds to a transition N c r?…”

mentioning

confidence: 99%

On the excited‐state geometry of the adenine residue as revealed by a preresonance Raman effect

Tsuboi

Hirakawa

Nishimura

et al. 1974

J Raman Spectroscopy

View full text Add to dashboard Cite

The Raman spectrum of ~-adenosine-5'-phosphoric acid has been observed in its aqueous solution with 6471, 5145, 4880, 4579, 3638, and 3511 8, excitation. An examination of the manner of increase of the intensities of the Raman lines at 1580 and 1484 cm-l of the adenine residue indicated that the electronic excited state corresponding to a weak absorption band at 276 nm is responsible for these Raman scatterings. This idea has been supported by a similar examination of the Raman spectrum of /l-adenosine-3',5'-cyclic phosphoric acid and an examination of the effect of temperature on the Raman spectra of poly rA and poly(rA-rU). A discussion is included of the geometrical structure of the adenine residue in its lowest-singlet electronic excited state, based on the vibrational structure of the fluorescence spectrum, the result of a normal coordinate treatment, and the result of a semiempirical Pariser-Parr-Pople calculation, as well as the Raman data.

show abstract

Polarized Raman spectra—I. Selection rules

Cited by 49 publications

References 14 publications

Modulation of the electronic structure of polyconjugated organic molecules by geometry relaxation: A discussion based on local Raman parameters

Modulation of the electronic structure of polyconjugated organic molecules by geometry relaxation: A discussion based on local Raman parameters

Preresonance Raman scattering of overtones: The scattering of two overtones of benzene in the ultraviolet

On the excited‐state geometry of the adenine residue as revealed by a preresonance Raman effect

Contact Info

Product

Resources

About