Results 161 to 170 of about 299,211 (194)

Intersystem Crossings in Late-Row Elements: A Perspective

The Journal of Physical Chemistry Letters, 2022
Intersystem crossing (ISC), a vital component of the electronic and nuclear transitions that compose photophysics, has been successfully simulated in light elements and transition metal complexes. Derived from the Z-dependent spin-orbit coupling (SOC), ISC is expected to be of greater importance in heavier elements, but few attempts have been made at ...
Andrew J. S. Valentine, Xiaosong Li
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Intersystem crossing of triplet formaldehyde

Chemical Physics Letters, 1974
Abstract Triplet benzene (3B1U sensitized decomposition of H2CO in the gas phase gives an appreciable yield of “molecules” H2 and CO. This evidence supports that T1↭S0 intersystem crossing in formaldehyde is an efficient and important process. The implication of this is that S1↭T1 intersystem crossing could be important, more so than recognized ...
Richard G. Miller, Edward K.C. Lee
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Intersystem crossing and predissociation of haloaromatics

The Journal of Chemical Physics, 1982
The mechanism for the dissociation of several haloaromatic molecules has been investigated by means of absorption and emission picosecond spectroscopy. It is found that the rates of intersystem crossing and dissociation increase from chloro to bromo to iodo substituents. It is observed that the position of the halo substituent and temperature influence
D. Huppert, S. D. Rand, A. H. Reynolds, P. M. Rentzepis   +3 more
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Intersystem Crossing in Gaseous Molecules

The Journal of Chemical Physics, 1967
The 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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Intersystem crossing in sulphur dioxide

Journal of the Chemical Society, Faraday Transactions 2, 1977
Excitation 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, Kevin F. Langley, John P. Simons   +2 more
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CIDNP and intersystem crossing in biradicals

Chemical Physics Letters, 1979
Abstract Magnetic field dependence curves are presented for the 13 C CIDNP signals resulting from photolysis of 2-phenylcycloalkanones in cyclohexane. One of the three biradical-derived products, the trapped ketene, reverses its polarization at high field.
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Comments on activated intersystem crossing

Chemical Physics Letters, 1972
Abstract Parameters defining temperature-dependent and temperature-independent intersystem crossing from the fluorescent state of 1,2-benzanthracene are reported, and their significance is discussed in terms of multilevel crossing from vibrationally excited singlet states.
M.F. Thomaz, M. Isabel Barradas, B. Stevens   +2 more
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The effects of intersystem and reverse intersystem crossing on the optical limiting properties of C60

Journal of Applied Physics, 2020
By presenting a theoretical steady-state rate equation analysis, we demonstrate an efficient optical power limiting in a fullerene system, which can be attributed to a reverse saturable absorption mechanism. The limiting behavior, characterized by means of the sample’s transmittance, is explained via the population redistribution among singlet and ...
Mohadeseh Veisi, Seyedeh Hamideh Kazemi, Mohammad Mahmoudi   +2 more
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Intersystem crossing in photosynthetic pigments

Chemical Physics Letters, 1977
Abstract Intersystem crossing (ISC) of chlorophyll a in solution exhibits a strong solvent dependence and a weak deuterium isotope effect. This is due to the importance of the molecular geometry in promoting ISC. These results are generalized to other closely related photosynthetic pigments.
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Quantum beats on intersystem crossing

Journal of Molecular Structure, 1980
Abstract 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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