Resonance Raman scattering of semiquinone radical anions

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.441046· OSTI ID:6406499

Tripathi, G N.R.

The time resolved electronic absorption spectra of p-benzosemiquinone (PBSQ) and 2,5-di-t-butyl-p-benzosemiquinone (DTBSQ) radical anions are obtained in pulse radiolysis. The same radicals have been generated chemically in a flow system. The Raman spectra are excited by tuning a pulsed dye laser in the electronic absorption region. Time adjusted gate electronics have been used for the temporal resolution of the Raman spectra from fluorescence. The resonance effect has been utilized to record the Raman spectra of unstable semiquinone radical anions, 10/sup -3/--10/sup -/4 M in concentration. The observed Raman spectra and excitation profile are interpreted to assign the electronic and the vibrational transitions in the radicals. The semiquinone radical anions are fairly stable on photoirradiation above 330 nm.

• Research Organization: Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556
• OSTI ID: 6406499
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600 -- Radiation Chemistry
640300* -- Atomic
Molecular & Chemical Physics
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ANIONS
AROMATICS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INELASTIC SCATTERING
IONS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
QUINONES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RAMAN SPECTRA
RESONANCE SCATTERING
SCATTERING
SPECTRA
VIBRATIONAL STATES