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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. 170:220-227
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 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 T 1 obtained from CW MQ EPR and SR EPR are compared.
- Subjects :
- Nuclear and High Energy Physics
Electron nuclear double resonance
Condensed matter physics
Chemistry
Pulsed EPR
Relaxation (NMR)
Electron Spin Resonance Spectroscopy
Biophysics
Spin–lattice relaxation
Signal Processing, Computer-Assisted
Condensed Matter Physics
Biochemistry
law.invention
Bloch equations
law
Excited state
Continuous wave
Nitrogen Oxides
Spin Labels
Atomic physics
Microwaves
Electron paramagnetic resonance
Subjects
Details
- ISSN :
- 10907807
- Volume :
- 170
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetic Resonance
- Accession number :
- edsair.doi.dedup.....20539839880ac363e05404628e548e0e