Radical ions in condensed phase produced by two-photon ionization: A study of geminate recombination by fluorescence detected magnetic resonance

Journal Article · Thu Jan 24 04:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100155a012· OSTI ID:5808426

Bakker, M G; Trifunac, A D ^[1]

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1. Argonne National Lab., IL (USA)

Geminate radical ions produced in laser photoionization of aromatic compounds in 2-propanol were studied by fluorescence detected magnetic resonance (FDMR). This optical detection of magnetic resonance of transient radical ions allows identification of radical ions via hyperfine coupling parameters and determination of spin multiplicity of the radical ion pairs and thus the multiplicity of the precursor states. In all molecules studied, it was found that photoionization occurs predominantly from singlet state. Laser power dependence studies of anthracene and TMPD (N,N,N{prime},N{prime}-tetramethyl-p-phenylenediamine) both show two-photon ionization with intense 308-nm light. By use of known photophysical parameters, the laser power dependence of the FDMR signal could be satisfactorily modeled on the basis of sequential, two-photon ionization through the first excited single state.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5808426
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AMINES
ANTHRACENE
AROMATICS
CHARGED PARTICLES
CHEMICAL REACTIONS
CONDENSED AROMATICS
DATA
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HYDROCARBONS
INFORMATION
IONIZATION
IONS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
RESONANCE
SPECTROSCOPY