Results 161 to 170 of about 21,954 (210)
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Ionization photophysics and spectroscopy of dicyanoacetylene
The Journal of Chemical Physics, 2013Photoionization of dicyanoacetylene was studied using synchrotron radiation over the excitation range 8–25 eV, with photoelectron-photoion coincidence techniques. The absolute ionization cross-section and detailed spectroscopic aspects of the parent ion were recorded.
Leach, Sydney +8 more
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Primary Photophysical Properties of Ofloxacin¶
Photochemistry and Photobiology, 2000Steady-state fluorescence has been used to study the excited singlet state of ofloxacin (OFLX) in aqueous solutions. Fluorescence emission was found to be pH dependent, with a maximum quantum yield of 0.17 at pH 7. Two pKa*s of around 2 and 8.5 were obtained for the excited singlet state.
S, Navaratnam, J, Claridge
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Photophysical Studies on Antimalarial Drugs
Photochemistry and Photobiology, 1999Abstract— Most drugs used in the treatment of malaria produce phototoxic side effects in both the skin and the eye. Cutaneous and ocular effects that may be caused by light include changes in skin pigmentation, corneal opacity, cataract formation and other visual disturbances including irreversible retinal damage (retinopathy) leading to blindness. The
A G, Motten +7 more
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Journal of the Chemical Society, Perkin Transactions 2, 1995
Monocyclic and acyclic 2-ene-1,4-diones have been investigated by electronic absorption and luminescence emission spectroscopies, as well as by the laser flash-photolysis technique (enedione triplet–triplet transient absorptions being observed). The energies of the three lowest excited singlet and of the lowest excited triplet states were determined ...
Luiz H. Catalani +2 more
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Monocyclic and acyclic 2-ene-1,4-diones have been investigated by electronic absorption and luminescence emission spectroscopies, as well as by the laser flash-photolysis technique (enedione triplet–triplet transient absorptions being observed). The energies of the three lowest excited singlet and of the lowest excited triplet states were determined ...
Luiz H. Catalani +2 more
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PHOTOPHYSICS AND PHOTOCHEMISTRY OF PHOTOREACTIVATION
Photochemistry and Photobiology, 1977Abstract— Photoreactivating enzyme (PRE) monomerizes cyclobutyl pyrimidine dimers formed in DNA by UV light (Λ < 300 nm). The enzyme requires near UV and visible wavelengths (300 < Λ < 600 nm) for activity. Possible mechanisms of action of the PRE are suggested by non‐enzymatic processes in which pyrimidine dimers are monomerized by UV and ...
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Photophysics and photochemistry
Physics Today, 1977Current progress with tunable lasers has made possible the selective excitation of practically any single quantum state of an atom or a molecule with excitation energy in the range 0.1 to 10 eV. Already we can obtain coherent radiation with sufficient intensity to excite a significant fraction of an atomic or molecular sample into chosen quantum states
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Photophysics of dibenzodioxocins
Journal of Photochemistry and Photobiology A: Chemistry, 2006Abstract The photophysics and photochemical reactivity of dibenzodioxocins (DBDO) was evaluated, considering experimental and theoretical data related to two model compounds, a phenolic and a non-phenolic and two theoretical analogues. Both compounds exhibit similar photophysical properties, influenced by solvent polarity.
Antonio Eduardo da Hora Machado +4 more
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The Journal of Chemical Physics, 1981
We use laser spectroscopic methods to measure fluorescence lifetimes of CF3NO. These lifetimes correspond to radiationless decay from specific torsional and other vibrational levels of the S1 state of CF3NO. The lifetime data and collisional quenching studies are used to support a model of S1 internal conversion to S0, followed by dissociation to CF3 ...
Kenneth G. Spears, Lynn D. Hoffland
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We use laser spectroscopic methods to measure fluorescence lifetimes of CF3NO. These lifetimes correspond to radiationless decay from specific torsional and other vibrational levels of the S1 state of CF3NO. The lifetime data and collisional quenching studies are used to support a model of S1 internal conversion to S0, followed by dissociation to CF3 ...
Kenneth G. Spears, Lynn D. Hoffland
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Photophysics in emerging photovoltaics
The Journal of Chemical Physics, 2023Nicholas E. Jackson +3 more
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