Spin polarization mechanisms in early stages of photoinduced charge separation in surface-modified TiO2 nanoparticles

T. Rajh, O. Poluektov, A. A. Dubinski, G. Wiederrecht, M. C. Thurnauer, A. D. Trifunac

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Steady-state and time-resolved electron paramagnetic resonance (EPR) experiments reveal that photoinduced charge separation in surface-modified nanoparticles yields interacting electron-hole radical pairs with spectral features indicative of a range of dynamic properties (Radical Pair Model and emissive Triplet Model CIDEP). Fast exchange in the radical pair is indicated by the presence of a central line at the midpoint, (gave=(gh+ge)/2) , of electron and hole g-factors. Excess emission is consistent with the triplet character of the exciton precursor. A subset of electron-hole radical pairs exhibits the spin feature characteristic of correlated radical pair polarization (CRPP) reflecting a weak interaction between photogenerated holes and electrons.

Original languageEnglish (US)
Pages (from-to)31-39
Number of pages9
JournalChemical Physics Letters
Volume344
Issue number1-2
DOIs
StatePublished - Aug 17 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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