Radical ion recombination in photoionization: Observations by fluorescence detected magnetic resonance

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100348a004· OSTI ID:7022329

Percy, L T; Bakker, M G; Trifunac, A D ^[1]

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1. Argonne National Lab., IL (USA)

Observations of time-resolved fluorescence detected magnetic resonance (FDMR) from the fluorescent recombination of geminate radical ion pairs produced by laser photoionization of scintillators in alcohols and ethers are described. The FDMR spectrum of the geminate radical ion pair produced from N,N,N{prime},N{prime}-tetramethyl-p-phenylenediamine (TMPD) in 2-propanol was resolved and assigned to the TMPD radical cation and the solvated electron. An FDMR signal was observed in hydrocarbons with small amounts of added alcohol, but not in neat hydrocarbons. In all cases, the FDMR signal observed was a resonant decrease in fluorescence intensity, indicating that photoionization occurs predominantly from singlet excited states. It is concluded that stabilization of he geminate ion pair by electron solvation is a key requirement for the observation of FDMR from the recombination of geminate ion pairs produced by photoionization.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7022329
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
CHARGED PARTICLES
DATA
DATA ANALYSIS
ETHERS
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
IONIZATION
IONS
LIQUID SCINTILLATORS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOSPHORS
PHOTOIONIZATION
RADICALS
RESONANCE