scholarly journals Electron spin relaxation due to reorientation of a permanent zero field splitting tensor

2004 ◽  
Vol 121 (11) ◽  
pp. 5387-5394 ◽  
Author(s):  
Nathaniel Schaefle ◽  
Robert Sharp
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Electron Spin Relaxation

Electron and nuclear spin relaxation in paramagnetic transition-metal complexes with S = 1. The effects of a non-zero average zero-field splitting on the spin energy levels

1978 ◽  
Vol 31 (3) ◽  
pp. 475 ◽  
Author(s):  
DT Pegg ◽  
DM Doddrell
Keyword(s):  
Transition Metal Complexes ◽  
Spin Relaxation ◽  
Energy Levels ◽  
Nuclear Spin Relaxation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Electron Spin Relaxation ◽  
Spin Lattice ◽  
Splitting Constant

The effects of a non-zero average zero-field splitting on electron spin relaxation in paramagnetic (S = 1) complexes is treated theoretically. The spin-lattice interaction is postulated to be a simple scalar P(t). S process with correlation time Ti. This process is assumed not to modulate the zero-field splitting which, however, is modulated by the molecular tumbling. The frequency dependence of the nuclear relaxation time (Tl) now depends on the magnitude of the zero-field splitting constant (D), and, for large values of D, the value of T1 is independent of the applied field strength.

KMR-Spektroskopie an paramagnetischen Komplexen, VI / NMR Spectroscopy on Paramagnetic Complexes, VI

1974 ◽  
Vol 29 (11-12) ◽  
pp. 708-712 ◽  
Author(s):  
Frank H. Köhler
Keyword(s):  
Relaxation Time ◽  
Nmr Spectroscopy ◽  
Line Width ◽  
Spin Relaxation ◽  
Electron Spin ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Nmr Spectrum ◽  
Electron Spin Relaxation ◽  
Paramagnetic Complexes

The 13C PFT NMR and 1H CW NMR spectrum of bis(h5-t-butylcyclopentadienyl)vanadium were recorded, and the signals assigned. A distinct superiority of the 13C spectroscopy is shown. As the observability of these signals depends on the line width the influence of the electron-spin relaxation time τe on dipolar and contact broadening is analysed. It is found that both broadenings should be of similar size. Except for the ring carbon atoms of nickelocenes the 13C signals of paramagnetic metallocenes should be easy to observe. Using the 13C results dipolar as well as contact contribution to the experimentally found line width are separated, and τe is determined. From Te it is concluded that zero-field splitting does not essentially affect the electron-spin relaxation.

Electron spin relaxation in solutions of transition metal ions with S ≥ 1. Conditions where the Redfield limit is valid

1978 ◽  
Vol 31 (3) ◽  
pp. 469 ◽  
Author(s):  
AK Gregson ◽  
DM Doddrell ◽  
DT Pegg
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Relaxation Times ◽  
Transverse Relaxation Time ◽  
Transition Metal Ions ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Transverse Relaxation ◽  
Electron Spin Relaxation ◽  
Field Strengths

Electron spin relaxation for S = 2 by modulation of the quadratic zero- field splitting under conditions when Te2 > Tl, is treated theoretically. It is shown that the appropriate relaxation matrices when solved numerically yield at high-field strengths two different electron spin relaxation times with different relative weightings. The relative weights are field-dependent, there being only one longitudinal and one transverse relaxation time at low-field strengths. The relaxation matrices for S = 1, 3/2,2,5/2 are summarized in the Appendix.

Theory of spin relaxation in the limit of slow motion. Nuclear and electron spin relaxation in paramagnetic transition-metal complexes

1976 ◽  
Vol 29 (9) ◽  
pp. 1869 ◽  
Author(s):  
DT Pegg ◽  
DM Doddrell
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Correlation Time ◽  
Initial Density ◽  
Relaxation Times ◽  
Proton Spin ◽  
Time Limit ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Electron Spin Relaxation

A theory of spin relaxation is developed which can be applied to cases where the Redfield limit (T2 � tt) does not hold. A simplification over the conventional approach is achieved by working entirely in a reference frame in which the initial density matrix is diagonal. This allows the general relaxation equations to be written in a simple analytic form without the need for perturbation theory. In the short correlation time limit this general form reduces to the usual Redfield equations for the relaxation times. In the long correlation time limit a corresponding result can be obtained, but is dependent on the assumed ensemble distribution. Electron spin relaxation by modulation of the quadratic zero-field splitting for S = 3/2 is treated explicitly. The theory is used to analyse proton spin relaxation in some halogenobis(N,N-diethyl-dithiocarbamato)iron(111) complexes.

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