Journal ArticleDOI
Intensities of Electronic Transitions in Molecular Spectra I. Introduction
TLDR
The neglected problem of the theory of the absolute intensities of electronic transitions in molecular spectra is discussed in this paper, where general equations for dipole strength, Einstein coefficients, mean lifetimes of excited states, f values, and so forth are collected in forms convenient for use in later papers where the theory for various types of transitions will be developed and applied.Abstract:
The neglected problem of the theory of the absolute intensities of electronic transitions in molecular spectra is discussed. General equations for dipole strength, Einstein coefficients, mean lifetimes of excited states, f values, and so forth, are collected in forms convenient for use in later papers where the theory for various types of transitions will be developed and applied.read more
Citations
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Journal ArticleDOI
Spectra of porphyrins
TL;DR: In this article, the absorption spectra of metal porphyrins derived from the basic skeleton are discussed in terms of a four-orbit model, that is intensity changes and energy shifts are related to the properties of two top filled and two lowest empty pi orbitals.
Journal ArticleDOI
Highly efficient blue electroluminescence based on thermally activated delayed fluorescence.
Shuzo Hirata,Sakai Yumi,Kensuke Masui,Hiroyuki Tanaka,Sae Youn Lee,Hiroko Nomura,Nozomi Nakamura,Mao Yasumatsu,Hajime Nakanotani,Qisheng Zhang,Katsuyuki Shizu,Hiroshi Miyazaki,Chihaya Adachi +12 more
TL;DR: It is shown that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions.
Journal ArticleDOI
Study of the Effects of Substitution on the Absorption Spectra of Porphin
TL;DR: In this paper, a model for the excited states of porphin is presented, which is viewed as arising from two configurations which can be mixed to varying degrees, and the effects of substituents are discussed, first the limitations imposed by symmetry requirements and then the requirements imposed if they act as one electron perturbations.
Journal ArticleDOI
Spectra of porphyrins: Part II. Four orbital model
TL;DR: In this paper, the configuration interaction parameters for reduced porphyrins, azaporphins, and benzporphins were determined using the LCAO-MO (Huckel) calculation.
Journal ArticleDOI
Optical Rotatory Dispersion of Helical Polymers
TL;DR: In this paper, it was shown that for every transition in its individual residues, a helix has two transitions whose moments are respectively parallel and perpendicular to the screw axis, and that the largest contributions to the rotational strengths of these bands are equal and opposite in the two cases.
References
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Journal ArticleDOI
On σ -Type Doubling and Electron Spin in the Spectra of Diatomic Molecules
TL;DR: In this paper, it was shown that the rotational distortion due to molecular rotation causes the width of a spin multiplet to depend on the position of the spin axis relative to the axis of the figure.
Journal ArticleDOI
Absorption of Light in Organic Compounds
TL;DR: In this paper, a first attempt is made to evaluate from published measurements the total strength and width of absorption bands of organic compounds, and to correlate that with the nature of the solvent and the constitution of the substance.
Absorption of Light in Organic Compounds.
TL;DR: In this paper, a first attempt is made to evaluate from published measurements the total strength and width of absorption bands of organic compounds, and to correlate that with the nature of the solvent and the constitution of the substance.
Journal ArticleDOI
The Continuous Absorption of Oxygen Between 1750 and 1300A and Its Bearing Upon the Dispersion
TL;DR: In this paper, the authors investigated the continuous absorption of oxygen between 1750 and 1300A with a small fluorite spectrograph by the photographic-photometric method and showed that the absorption co-efficient as function of the wave number has a relatively sharp maximum at 6.8 and falls off rather symmetrically on both sides.
Journal ArticleDOI
Kinetics of OH Radicals as Determined by Their Absorption Spectrum III. A Quantitative Test for Free OH; Probabilities of Transition
O. Oldenberg,F. F. Rieke +1 more
TL;DR: In this article, the authors used photometry of the absorption lines photographed with high resolving power to make the OH absorption bands applicable to a quantitative chemical test for free OH their probability of transition (f value) was measured by the concentration of ''dispersion electrons'' in a known concentration of OH.