Analysis of electron spin stimulated echo modulation in randomly oriented solids: /sup 15/N modulation of bacteriochlorophyll a radical cation

Journal Article · Fri Nov 15 00:00:00 EST 1985 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.449750· OSTI ID:5186700

Tang, J; Lin, C P; Norris, J R

An improved and more reliable method for the analysis of the electron spin stimulated echo modulation in randomly oriented solids is presented. In this method the uncertainty in the decay function of the spin echo modulation envelope is largely eliminated by dividing modulation traces of various tau in the three pulse spin echo measurements. A nonlinear least squares fit procedure is then used to determine the hyperfine couplings. We have applied this method to determine the isotropic and the anisotropic hyperfine coupling constants of the /sup 15/N nuclei in the bacteriochlorophyll a radical cation. In our model the hyperfine tensors of four nitrogen nuclei are assumed to be axially symmetric and parallel to each other. The results are consistent with the reported values obtained by the electron nuclear double resonance technique.

• Research Organization: Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5186700
• Journal Information: J. Chem. Phys.; (United States), Vol. 83:10
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHLOROPHYLL
ELECTRON SPIN RESONANCE
CATIONS
ENDOR
HYPERFINE STRUCTURE
MODULATION
RADICALS
SPIN ECHO
CARBOXYLIC ACIDS
CHARGED PARTICLES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
IONS
MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
RESONANCE
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)