Local density effects on the hyperfine splitting constant and line width of TEMPO radical in gaseous and supercritical carbon dioxide

Takashi Tachikawa, Kimio Akiyama, Chiaki Yokoyama, Shozo Tero-Kubota

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The density dependences of the nitrogen hyperfine coupling constant (a N) and line width (ΔHpp) of the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) free radical have been investigated at near-infinite dilution in gaseous and supercritical carbon dioxide using steady-state EPR spectroscopy. The local density augmentation around the radical is quantified based on the density dependences of the a N. The viscosity dependences of the ΔHpp are reproduced by the modified Stokes-Einstein equation, suggesting the local solute-fluid density augmentation.

Original languageEnglish
Pages (from-to)350-357
Number of pages8
JournalChemical Physics Letters
Volume376
Issue number3-4
DOIs
Publication statusPublished - 2003 Jul 24

ASJC Scopus subject areas

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

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