Results 241 to 250 of about 28,603 (262)
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Matrix elements for intersystem crossing
Chemical Physics Letters, 1975Abstract A new formulation of intersystem-crossing matrix elements is presented which includes correction for prompt scattering and avoids the Herzberg-Teller expansion for nonadiabatic coupling.
Willem Siebrand, Marek Z. Zgierski
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Experimentally Observed Reverse Intersystem Crossing‐Boosted Lasing
Angewandte Chemie, 2020AbstractThermally activated delayed‐fluorescent (TADF) materials are anticipated to overcome triplet‐related losses towards electrically driven organic lasers. Thus far, contributions from triplets to lasing have not yet been experimentally demonstrated owing to the limited knowledge about the excited‐state processes.
Zhonghao Zhou +11 more
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The intersystem crossings in glyoxal
Molecular Physics, 1976The mechanisms of the intersystem crossing processes of glyoxal have been investigated through the microwave induced delayed phosphorescence (MIDP) experiment, the measurements of the phosphorescence quantum yield and lifetimes, and numerical calculations of the electronic parts of the coupling matrix elements.
Nobuyuki Nishi +2 more
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Intersystem crossing in sulphur dioxide
Journal of the Chemical Society, Faraday Transactions 2, 1977Excitation spectra of the fluorescence of SO2 and of the SO2 photosensitised phosphorescence of biacetyl have been recorded between 250 and 325 nm, and the rates of decay of the fluorescence and the generation and decay of the biacetyl phosphorescence have been monitored following pulsed laser excitation at (295–300 nm).
Fakhruddin Ahmed +2 more
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Understanding and Controlling Intersystem Crossing in Molecules
Annual Review of Physical Chemistry, 2021This review article focuses on the understanding of intersystem crossing (ISC) in molecules. It addresses readers who are interested in the phenomenon of intercombination transitions between states of different electron spin multiplicities but are not familiar with relativistic quantum chemistry.
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Studies of intersystem crossing dynamics in acetylene
The Journal of Chemical Physics, 2007We report a new ab initio study of the acetylene T3 potential energy surface, which clarifies the nature of its energy minimum, and present computed equilibrium geometries and diabatic frequencies. This information enables the computation of harmonic vibrational overlap integrals of T3 vibrational levels with the S1 3ν3 state.
Ryan L, Thom +3 more
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Intersystem Crossing in Gaseous Molecules
The Journal of Chemical Physics, 1967The theory of electronic relaxation in the solid phase is discussed in terms of gaseous molecules. Two limits are examined—the ``small-molecule limit'' (α limit), where electronic relaxation cannot occur in the free molecule, and the ``big-molecule limit'' (ω limit), where electronic relaxation at a rate virtually identical with that in the solid can ...
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Quantum beats on intersystem crossing
Journal of Molecular Structure, 1980Abstract Quantum interference effects in the S 1 → T intersystem crossing and T → S 0 phosphorescence of aza-aromatic molecules are demonstrated. These may arise if the electronic structure of the triplet state T is such that the principal spin-orbit coupling path connects a non-stationary spin state of T with the singlet system.
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Hyperfine Interaction Promoted Intersystem Crossing
Applied Magnetic Resonance, 2019The mechanism of the intersystem crossing (ISC) in planar aromatic hydrocarbons is revised by considering hyperfine interaction promoted singlet–triplet transitions. The density matrix of the spin system of the metastable triplet state is derived. Extra terms including the electron-nuclear ordering, the ordering between the magnetic nuclei of the ...
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Intersystem Crossing Processes in Nonplanar Aromatic Heterocyclic Molecules
The Journal of Physical Chemistry A, 2007A comprehensive study of the photophysical properties of a series of monoaza[5]helicenes is presented on the basis of joint optical spectroscopy and quantum chemistry investigations. The molecules have been characterized by absorption and CW/time-resolved luminescence measurements.
Schmidt, K +10 more
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