Abstract
A procedure has been developed for measuring the true radical concentration during in situ photolysis e.s.r. experiments, even when the e.s.r. signal is modified as a result of initial electron spin polarization in the photolytically generated radicals. The validity of kinetic e.s.r. studies is thereby extended to shorter times. This procedure depends on an extended kinetic model for chemical induced dynamic electron polarization (CIDEP) incorporating emissive-absorptive (E–A) polarization and initial polarization (IP). The model is tested, using data obtained from a pulse photolysis system, by a study of the behaviour of the semidione radicals of pyruvic acid and biacetyl in alcoholic solvents. For pairs of peaks with the same |∑AIMI|, the difference in peak heights represents E–A polarization while the sum incorporates initial polarization, so the two components can be separated. Further experiments have established the viscosity dependences of the two types of polarization.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
