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Determination of T1-spin–lattice relaxation time in a two-level system by continuous wave multiquantum electron paramagnetic resonance spectroscopy in a presence of tetrachromatic microwave irradiation
- Source :
-
Journal of Magnetic Resonance . Oct2004, Vol. 170 Issue 2, p220-227. 8p. - Publication Year :
- 2004
-
Abstract
- Applicability of continuous wave multiquantum EPR methods to study relaxation times at X-band is examined. Multiquantum transitions excited in a two-level system by tetrachromatic irradiation are used for these studies. The Bloch equation model is applied to simulate lineshapes of the three quantum transitions as a function of frequency difference between exciting fields. The dependence of multiquantum transition signals on relaxation times and microwave amplitude is shown. On this basis a method of deducing relaxation times from these signals is formulated. The case of a homogeneously and inhomogeneously broadened resonance line is considered. Two experimental methods are used to verify the proposed hypothesis: the X-band continuous wave multiquantum EPR with four frequencies microwave field and saturation recovery EPR. The values of T1 obtained from CW MQ EPR and SR EPR are compared. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 10907807
- Volume :
- 170
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Magnetic Resonance
- Publication Type :
- Academic Journal
- Accession number :
- 14514355
- Full Text :
- https://doi.org/10.1016/j.jmr.2004.07.002