Spin-orbit coupling, spin-lattice relaxation, and spin-memory studies ofF-center-molecular-ion pairs in alkali halides

1993 ◽  
Vol 15 (2-3) ◽  
pp. 207-228 ◽  
Author(s):  
G. Baldacchini ◽  
S. Botti ◽  
U. M. Grassano ◽  
F. Luty
Keyword(s):  
Ion Pairs ◽  
Alkali Halides ◽  
Lattice Relaxation ◽  
Memory Studies ◽  
Orbit Coupling ◽  
Spin Lattice Relaxation ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Molecular Ion ◽  
Spin Lattice

Spin Relaxation Times of Donor Centers Associated with Lithium in Monoisotopic 28 Si

2015 ◽  
Vol 242 ◽  
pp. 322-326
Author(s):  
Alexander A. Ezhevskii ◽  
Alexandra P. Detochenko ◽  
Sergey A. Popkov ◽  
Anton A. Konakov ◽  
Andrey V. Soukhorukov ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Continuous Wave ◽  
Coupling Parameter ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Orbit Coupling ◽  
Spin Lattice Relaxation ◽  
Transverse Spin ◽  
Spin Orbit Coupling ◽  
Spin Orbit

We report a detailed study of electron longitudinal and transverse spin relaxation times for Li donors in monoisotopic 28Si over the temperature range 4–20 K using continuous wave and pulsed electron paramagnetic resonance. Comparison of the obtained spin-lattice relaxation times for the states of the isolated donor center and lithium complex LiO showed that due to the presence of orbital degeneracy, relaxation is faster for single lithium than for the LiO complexes with the nondegenerate ground state. For the isolated lithium center in silicon the relaxation is well described by Blume-Orbach process, with the parameters of the spin-orbit coupling ~ 1·10-6 meV compare to Orbach process for LiO complex with spin-orbit coupling parameter ~ 1.5·10-2 meV.

The spin-lattice relaxation and spin-orbit interaction of F center in the relaxed excited state

1983 ◽  
Vol 72 (1-4) ◽  
pp. 171-175 ◽  
Author(s):  
H. Ohkura ◽  
K. Iwahana ◽  
K. Tara ◽  
M. Hirata ◽  
Y. Mori
Keyword(s):  
Excited State ◽  
Lattice Relaxation ◽  
Orbit Interaction ◽  
Spin Lattice Relaxation ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Spin Lattice ◽  
F Center

Symmetry analysis of states of ion pairs in crystals

1982 ◽  
Vol 384 (1786) ◽  
pp. 191-203
Keyword(s):  
Ion Pairs ◽  
Symmetry Reduction ◽  
Symmetry Analysis ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Symmetry Classification

The symmetry classification of the states of a pair of interacting ions in a crystal is obtained by a formal symmetry reduction not dependent upon any assumptions about the details of the interaction. The theory is given in versions valid with or without spin-orbit coupling, and for pairs in magnetic or non-magnetic hosts. Some discrepancies with previous work are discussed.

Time resolved magnetic modulation of ion recombination in organic solutions: spin motion in radical ion pairs

1977 ◽  
Vol 55 (11) ◽  
pp. 2102-2106 ◽  
Author(s):  
Jean Klein ◽  
René Voltz
Keyword(s):  
Solid Solutions ◽  
Organic Liquid ◽  
Ion Pairs ◽  
Lattice Relaxation ◽  
Solute Concentration ◽  
High Energy ◽  
Spin Lattice Relaxation ◽  
Time Resolved ◽  
Spin Lattice ◽  
Organic Solutions

The evolution of the singlet character of correlated ion radical pairs, prepared by high energy impact (3 particles) in organic liquid and solid solutions, is monitored by nanosecond time resolved solute recombination fluorescence. Results obtained show that the relative variations [IB(t) − I0(t)]/I0(t) of the luminescence intensity in presence IB(t) and in absence I0(t) of magnetic fields (B < 5 kG) decrease exponentially with time, according to a field and solute concentration dependent rate, in liquid but not in solid solutions; in the case of 2b PPD as solute, a damped oscillating component could be observed. The results are interpreted in terms of hyperfine interaction induced coherent singlet–triplet mixing and of field and solute concentration dependent spin–lattice relaxation.

14N Nuclear Magnetic Resonance Relaxation of the Nitrate Ion and Ion Pairing in Aqueous Solution

1995 ◽  
Vol 48 (2) ◽  
pp. 207 ◽  
Author(s):  
G Owens ◽  
P Guarilloff ◽  
BJ Steel ◽  
T Kurucsev
Keyword(s):  
Aqueous Solution ◽  
Ion Pairs ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Metal Nitrate ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Fast Exchange ◽  
Resonance Relaxation ◽  
Two State Model

14 N n.m.r. spin-lattice relaxation times of four metal nitrate salts were measured as a function of concentration in aqueous solution. The concentration dependence of T1 was attributed to the formation of ion pairs with increasing concentration in these solutions. The T1 data, allowing for viscosity corrections, were treated by a two-state model of 'free' and 'bound' nitrate ions and to both possibilities of slow and fast exchange between the two states. In the equilibrium expressions estimates of the relevant activity coefficients were included. The slow nitrate exchange mechanism was favoured and the values obtained for this particular mechanism compared well with those derived from alternative measurements.

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