Multifrequency electron paramagnetic resonance of irradiated L-alanine.
The radical generated by gamma-irradiation of crystalline L-alanine was examined by continuous wave (CW) and pulsed electron paramagnetic resonance (EPR) at 1.8, 3.2, 4.9, 9.1 and 19.4 GHz. The spin-flip satellite lines that make a prominent contribution to the saturated spectra at 9.1 GHz are less conspicuous at lower frequencies because of overlap with the allowed transitions. The spin-lattice relaxation times measured by long-pulse saturation recovery and phase memory times measured by electron spin echo increase with increasing microwave frequency.
Ghim
B T
BT
Department of Chemistry, University of Denver, CO 80208, USA.
Du
J L
JL
Pfenninger
S
S
Rinard
G A
GA
Quine
R W
RW
Eaton
S S
SS
Eaton
G R
GR
D000409:Alanine / Q000737:chemistry / Q000528:radiation effects*; D003037:Cobalt Radioisotopes; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005069:Evaluation Studies as Topic; D005609:Free Radicals / Q000032:analysis / Q000528:radiation effects; D005720:Gamma Rays; D008872:Microwaves; D011874:Radiometry / Q000379:methods*
D003037:Cobalt Radioisotopes; D005609:Free Radicals; D000409:Alanine