Measurement of the rate of bimolecular electron spin relaxation between pairs of reactive radicals using time-resolved electron spin-echo spectroscopy

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

OSTI ID:7083146

Syage, J A; Lawler, R G; Trifunac, A D

The time-resolved electron spin echo (ESE) method has been employed to measure the bimolecular contribution to electron spin relaxation in the acetate radical xCH/sub 2/CO/sup -//sub 2/, formed by pulse radiolysis. Time-resolved ESE signals from solutions containing up to 4 x 10/sup -4/ M initial radical concentrations were analyzed using Bloch equations modified to include the effects of strong Heisenberg exchange, chemical reaction, and CIDEP. It is found that the electron exchange rate is approx.3 times faster than the chemical reaction rate, contrary to a simple model involving only statistical factors which predicts equal rates for the two processes. It is also found that the CIDEP enhancement factor is independent of initial radical concentration over the ten fold range of concentrations studied. (AIP)

• Research Organization: Department of Chemistry, Brown University, Providence, Rhode Island 02912
• OSTI ID: 7083146
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACETATES
ACOUSTIC ESR
BLOCH EQUATIONS
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DISPERSIONS
ELECTRON SPIN RESONANCE
EQUATIONS
EXCHANGE INTERACTIONS
INTERACTIONS
MAGNETIC RESONANCE
MIXTURES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RELAXATION
RELAXATION TIME
RESONANCE
SOLUTIONS
SPIN-LATTICE RELAXATION