Spin‐lattice relaxation of the quinoxaline triplet state in n‐alkane matrices measured in zero magnetic field

1987 ◽  
Vol 86 (4) ◽  
pp. 1789-1795 ◽  
Author(s):  
Sanjib Ghosh ◽  
Michael Petrin ◽  
August H. Maki
Keyword(s):  
Magnetic Field ◽  
Triplet State ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Zero Magnetic Field ◽  
Spin Lattice

Spin—lattice relaxation in the phosphorescent triplet state of acridine and phenanthrene in zero-magnetic field

1975 ◽  
Vol 36 (2) ◽  
pp. 225-228 ◽  
Author(s):  
D.A. Antheunis ◽  
B.J. Botter ◽  
J. Schmidt ◽  
P.J.F. Verbeek ◽  
J.H. van der Waals
Keyword(s):  
Magnetic Field ◽  
Triplet State ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Zero Magnetic Field ◽  
Spin Lattice

Optically Detected Spin Locking of Zero Field Electronic Triplet States and Cross Relaxation in the Rotating Frame

1975 ◽  
Vol 30 (3) ◽  
pp. 361-371 ◽  
Author(s):  
H. Schuch ◽  
C. B. Harris
Keyword(s):  
Magnetic Field ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Zero Magnetic Field ◽  
Zero Field ◽  
Triplet States ◽  
Rotating Frame ◽  
Spin Lattice ◽  
Optically Detected ◽  
Spin Locking

The spin locking method known from NMR is shown to be useful also in ESR for investigating spin lattice relaxation problems and “slow” motions, e. g. questions of energy transfer by triplet states in organic molecular crystals, and probing of nuclear quadrupolar splittings even smaller than the ESR line width at zero magnetic field.Optically detected ESR spin locking experiments for isolated triplet states in zero field are demonstrated. It is shown how the complication of incoming and decaying triplet states and relaxation between all three triplet sublevels has to be handled during spin locking. An application, the study of the cross-relaxation between electronic triplet spin states and deuteron or proton spins is presented. These experiments are possible in spite of the first order quenching of the hyperfine coupling in zero magnetic field. Another application is briefly mentioned, in which the adiabatically demagnetized state in the rotating frame is used to probe the electronic triplet state transfer and nuclear spin lattice relaxation.

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