Observation of short-lived radical ion pairs by pulse radiolysis of alkane solutions by time-resolved fluorescence-detected magnetic resonance. Electron paramagnetic resonance spectra of alkane radical cations

Journal Article · Thu Oct 28 04:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100219a014· OSTI ID:6497397

Smith, J P; Lefkowitz, S; Trifunac, A D

Time-resolved fluorescence-detected EPR studies of electron-irradiated solutions of 2,5-diphenyloxazole (PPO) in alkane solvents have shown that there are two distinct germinate radical ion pairs, distinguished by their lifetimes and EPR spectra. While the central EPR peak belongs to the aromatic radical ions, the broader components are assigned to the parent radical cation of the alkane solvent. Analysis of the resolved hyperfine structure indicates the presence of a trapped solvent hole in cyclohexane, which does not undergo unusually rapid charge exchange. The kinetic analyses of the EPR spectra show that scavenging events preserve the relative orientation of the unpaired electron spins in these geminate ion pairs.

• Research Organization: Argonne National Lab., IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6497397
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:22; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKANES
ALKYL RADICALS
AZOLES
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DISPERSIONS
ELECTRON BEAMS
ELECTRON SPIN RESONANCE
FLUORESCENCE
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ION PAIRS
IRRADIATION
LEPTON BEAMS
LIFETIME
LUMINESCENCE
MAGNETIC RESONANCE
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXAZOLES
PARTICLE BEAMS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RESONANCE
SCAVENGING
SOLUTIONS
SPECTRA