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.

scholarly journals Room-temperature optical manipulation of nuclear spin polarization in GaAsN

2014 ◽  
Vol 90 (11) ◽  
Author(s):  
C. Sandoval-Santana ◽  
A. Balocchi ◽  
T. Amand ◽  
J. C. Harmand ◽  
A. Kunold ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Room Temperature ◽  
Optical Manipulation ◽  
Nuclear Spin Polarization

Dynamical Nuclear Polarization

2018 ◽  
Author(s):  
M. M. Glazov
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Nuclear Polarization ◽  
Magnetic Moments ◽  
Nonlinear Effects ◽  
Many Body ◽  
Nuclear Spin Polarization ◽  
Optical Resonances ◽  
Dynamical Nuclear Polarization ◽  
Temperature Concept

The transfer of nonequilibrium spin polarization between the electron and nuclear subsystems is studied in detail. Usually, a thermal orientation of nuclei in magnetic field is negligible due to their small magnetic moments, but if electron spins are optically oriented, efficient nuclear spin polarization can occur. The microscopic approach to the dynamical nuclear polarization effect based on the kinetic equation method, along with a phenomenological but very powerful description of dynamical nuclear polarization in terms of the nuclear spin temperature concept is given. In this way, one can account for the interaction between neighbouring nuclei without solving a complex many-body problem. The hyperfine interaction also induces the feedback of polarized nuclei on the electron spin system giving rise to a number of nonlinear effects: bistability of nuclear spin polarization and anomalous Hanle effect, dragging and locking of optical resonances in quantum dots. Theory is illustrated by experimental data on dynamical nuclear polarization.

scholarly journals Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

2016 ◽  
Vol 93 (8) ◽  
Author(s):  
F. Heisterkamp ◽  
E. Kirstein ◽  
A. Greilich ◽  
E. A. Zhukov ◽  
T. Kazimierczuk ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Electron Spins ◽  
Nuclear Spin Polarization

Magnetic field dependence of fluorine-19 nuclear spin polarization. The system tetrafluorobenzoquinone-tetrafluorohydroquinone

1982 ◽  
Vol 104 (22) ◽  
pp. 5878-5883 ◽  
Author(s):  
Richard S. Hutton ◽  
Heinz D. Roth ◽  
Marcia L. Manion Schilling ◽  
Anthony M. Trozzolo ◽  
Thomas M. Leslie
Keyword(s):  
Magnetic Field ◽  
Spin Polarization ◽  
Field Dependence ◽  
Nuclear Spin ◽  
Magnetic Field Dependence ◽  
Nuclear Spin Polarization

Effective collinear optical pumping for nuclear spin polarization

2014 ◽  
Vol 31 (10) ◽  
pp. 2278 ◽  
Author(s):  
Sung Jong Park ◽  
Taeksu Shin ◽  
Ju Hahn Lee ◽  
Gi Dong Kim ◽  
Yong Kyun Kim
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Optical Pumping ◽  
Nuclear Spin Polarization

Ultrafast Nuclear Spin Polarization by Short Laser Pulses

2008 ◽  
Author(s):  
Takashi Nakajima ◽  
Ahovi Kponou ◽  
Yousef Makdisi ◽  
Anatoli Zelenski
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Laser Pulses ◽  
Nuclear Spin Polarization ◽  
Short Laser Pulses
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