Results 291 to 300 of about 90,891 (346)
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Journal of Molecular Spectroscopy, 1992
Abstract Twenty bands of the a3Πr-X1Σ+ transition of AlBr have been rotationally analyzed involving v′ from 0 to 10 and v″ from 0 to 8. The Π1 component is perturbed in the v = 0 and 1 vibrational levels. A new system has been observed for the first time; it is formed of 26 bands and is interpreted as the b3Σ+-X1Σ+ transition.
BREDOHL, Harald +4 more
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Abstract Twenty bands of the a3Πr-X1Σ+ transition of AlBr have been rotationally analyzed involving v′ from 0 to 10 and v″ from 0 to 8. The Π1 component is perturbed in the v = 0 and 1 vibrational levels. A new system has been observed for the first time; it is formed of 26 bands and is interpreted as the b3Σ+-X1Σ+ transition.
BREDOHL, Harald +4 more
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Photodissociation of N2O: Triplet states and triplet channel
The Journal of Chemical Physics, 2011The role of triplet states in the UV photodissociation of \documentclass[12pt]{minimal}\begin{document}$\rm N_2O$\end{document}N2O is investigated by means of quantum mechanical wave packet calculations. Global potential energy surfaces are calculated for the lowest two 3A′ and the lowest two 3A′′ states at the multi-reference configuration interaction
Schinke, R. +2 more
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Excited-State Triplet-Triplet Absorption in αNPO
Applied Spectroscopy, 1987Time-resolved excited-state triplet-triplet absorption measurements in αNPO solutions were performed. A concentration quenching effect on the excited absorption and fluorescence spectra, due to excimer formation, was seen. A numerical analysis of the results yielded the rate constants for intersystem crossing, triplet quenching by ...
A. N. Dharamsi, A. B. Hassam
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Phosphorescence and Triplet State Energies of Oligothiophenes
The Journal of Physical Chemistry B, 2005The phosphorescence spectra of a series of small oligothiophenes (nT, n = 1-3) incorporating a variety of substituents, end cappers, and functional groups have been recorded for the first time using gated detection in combination with nanosecond excitation in frozen solution at 80 K.
Wasserberg, D. +4 more
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1976
In our discussion in Chapter 1 of the various photophysical processes which can occur in an organic molecule upon absorption of light, we saw that two types of electronic excited states are possible. The first, initially reached upon excitation, is the singlet, in which the electronic spins remain paired.
Dwaine O. Cowan, Ronald L. Drisko
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In our discussion in Chapter 1 of the various photophysical processes which can occur in an organic molecule upon absorption of light, we saw that two types of electronic excited states are possible. The first, initially reached upon excitation, is the singlet, in which the electronic spins remain paired.
Dwaine O. Cowan, Ronald L. Drisko
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Journal of the Chemical Society, Perkin Transactions 2, 1977
The energy levels of the S1,S2 and T1 states of a range of cyclic and acyclic phenylalkenes have been determined and the structure–excited state energy level relationship examined. The S2(Franck–Condon maximum)–T1(absorption onset) energy gap is a constant for all the systems studied (189.5 ± 4 kJ mol–1). except the severely twisted cis-t-butylstyrene,
Paul M. Crosby +5 more
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The energy levels of the S1,S2 and T1 states of a range of cyclic and acyclic phenylalkenes have been determined and the structure–excited state energy level relationship examined. The S2(Franck–Condon maximum)–T1(absorption onset) energy gap is a constant for all the systems studied (189.5 ± 4 kJ mol–1). except the severely twisted cis-t-butylstyrene,
Paul M. Crosby +5 more
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The triplet state of azobenzene
Chemical Physics Letters, 1981Abstract The quenching rate constants ( k q ) for triplet energy transfer from aromatic hydrocarbons to trans and cis azobenzene have been measured by flash kinetic spectrophotometry. For both isomers the plot log k q versus E T of the donors shows a “non-classical” behaviour.
Sandra Monti +3 more
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Triplet State of Triphenylamine
Nature, 1969Two transient species with absorption peaks at 5300 and 6100 A have been observed in de-oxygenated solutions of triphenylamine by a flash photolysis technique1,2. The major product at room temperature is said to have been the 6100 A compound, and this was considered to be an “intermediate” from which N-phenyl carbazole was formed in the presence of ...
G. C. TERRY +2 more
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Canadian Journal of Chemistry, 1972
Ketene quenches the phosphorescence of both biacetyl and hexafluoroacetone. Although the quenching of hexafluoroacetone emission is nearly collision-controlled, that of biacetyl is much less efficient. The large difference in the rate constants is attributed to endothermic energy transfer from triplet biacetyl to ketene and exothermic energy transfer ...
John S. E. McIntosh, Gerald B. Porter
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Ketene quenches the phosphorescence of both biacetyl and hexafluoroacetone. Although the quenching of hexafluoroacetone emission is nearly collision-controlled, that of biacetyl is much less efficient. The large difference in the rate constants is attributed to endothermic energy transfer from triplet biacetyl to ketene and exothermic energy transfer ...
John S. E. McIntosh, Gerald B. Porter
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