FLIP-ANGLE EFFECTS IN FOURIER-TRANSFORM EPR-SPECTRA OF SPIN-CORRELATED RADICAL PAIRS

Authors
Citation
Cr. Timmel et Pj. Hore, FLIP-ANGLE EFFECTS IN FOURIER-TRANSFORM EPR-SPECTRA OF SPIN-CORRELATED RADICAL PAIRS, Chemical physics letters, 226(1-2), 1994, pp. 144-150
Citations number
25
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
ISSN journal
00092614
Volume
226
Issue
1-2
Year of publication
1994
Pages
144 - 150
Database
ISI
SICI code
0009-2614(1994)226:1-2<144:FEIFEO>2.0.ZU;2-4
Abstract
The EPR spectra of spin-correlated radical pairs in pulse-acquire Four ier-transform experiments are explored by means of spectral simulation s. In particular, the dependence on the flip-angle (alpha) of the micr owave pulse is examined. The spectra are seen to be linear combination s of two sub-spectra, with amplitudes proportional to sin alpha and si n 2alpha, which have distinctive shapes both for idealised dipolar-cou pled radical pairs with isotropic g-values and no hyperfine couplings, and under the conditions found for radical pair intermediates in phot osynthetic energy conversion. In cases of poor resolution, the two sub -spectra contain independent information on the structure and interact ions of the radical pairs, which should supplement data available from the more routine time-resolved continuous-wave experiment.