Origin of an absorptive electron spin polarization observed in photochemical hydrogen abstraction reaction by benzophenone derivatives. CW and pulsed EPR studies

Kimio Akiyama, Shinji Sekiguchi, Shozo Tero-Kubota

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Continuous wave time-resolved EPR (CW-TREPR) and pulsed Fourier transform EPR (FT-EPR) experiments were carried out to clarify the origin of an unusual electron spin polarization. We analyzed precisely the buildup and decay of the spin-polarized EPR spectra of the transienfradicals generated by laser pulse irradiation of benzophenone derivatives in propan-2-ol. It was found that the reaction of the spin-equilibrated triplet state of benzophenone derivatives was responsible for the net absorptive polarization, because the contribution of absorptive polarization was (4/3)Peq, where Peq is the signal intensity at the Boltzmann population in the Zeeman splitting of a radical. Kinetic parameters were also determined from the dynamics of the spin polarization.

Original languageEnglish
Pages (from-to)180-183
Number of pages4
JournalJournal of physical chemistry
Volume100
Issue number1
DOIs
Publication statusPublished - 1996 Jan 4

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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