Quenching of the 1.0 and 2.3 μm excited electronic states of PuF6 at room temperature by selected rare gases and small polyatomic molecules

1985 ◽  
Vol 83 (2) ◽  
pp. 567-571 ◽  
Author(s):  
J. E. Barefield ◽  
W. W. Rice ◽  
B. A. Dye
Keyword(s):  
Room Temperature ◽  
Electronic States ◽  
Polyatomic Molecules ◽  
Rare Gases ◽  
Excited Electronic States

Photooxidation and Decarboxylation of Tyrosine Studied by E.P.R. and C.I.D.N.P. Techniques

1972 ◽  
Vol 50 (23) ◽  
pp. 3849-3856 ◽  
Author(s):  
Micha Tomkiewicz ◽  
Robert D. McAlpine ◽  
Michael Cocivera
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Room Temperature ◽  
Electronic States ◽  
Tyrosyl Radical ◽  
Excited Electronic States ◽  
Nuclear Spin Polarization ◽  
Full Spectrum ◽  
The One ◽  
Text Formation

The photooxidation of deoxygenated solutions of tyrosine in water at pH 8.5–12.6 has been studied at room temperature using e.p.r. spectroscopy. By means of e.p.r., four radicals were detected during irradiation with the full spectrum of a Hg–Xe arc lamp. These were identified as the tyrosyl radical, [Formula: see text] and two radicals derived from dopa. A tentative mechanism suggested for [Formula: see text] formation involves the reaction of tyrosine with the hydrated electron, which has been ejected from another tyrosine molecule in one of its excited electronic states. A mechanism similar to the one proposed for the photooxidation of phenol has been suggested for the formation of the radicals derived from dopa. Support for this mechanism is provided by the observation of proton nuclear spin polarization during irradiation.

Relative rates of reaction of olefins with the ground and the first excited electronic states of methylene

1967 ◽  
Vol 45 (6) ◽  
pp. 665-673 ◽  
Author(s):  
S. Krzyzanowski ◽  
R. J. Cvetanović
Keyword(s):  
Electronic State ◽  
Ground State ◽  
Room Temperature ◽  
Excited Electronic State ◽  
Electronic States ◽  
Excited Electronic States

Relative rates of reaction of a number of olefins with the ground state triplet and the first excited electronic state (the lowest singlet) of methylene have been determined at room temperature. The rates depend relatively little on olefin structure. Triplet methylene is somewhat more discriminating and, in particular, reacts considerably more rapidly with 1,3-butadiene than with monoolefins.

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