Excitation energy dependence of the photoionization of liquid water

Journal Article · Thu Nov 04 04:00:00 EST 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100146a023· OSTI ID:5576151

Sander, M U; Luther, K; Troe, J ^[1]

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1. Universitaet Goettingen (Germany) Max-Planck-Institut fuer Biophysikalische Chemie, Goettingen (Germany)

Liquid water was ionized by UV two-photon excitation with intense subpicosecond laser pulses at 248.5 nm (two-photon energy 10 eV). Transient absorption signals, attributed to hydrated electrons, were monitored with probe pulses at 497 nm. It was found that about 30% of the hydrated electrons undergo geminate recombination with H[sub 3]O[sup +] ions or [sup [sm bullet]]OH radicals, which is considerably less than found in previous studies with excitation pulses at 310-312.5 nm (two-photon energy 8 eV) but still more than estimated for electron pulse radiolysis. Up to an excitation energy of 10 eV, the majority of ionization events is suggested to follow a concerted electron-transfer mechanism; in contrast to earlier conclusions, [open quotes]quasi-free[close quotes] electrons apparently play only a minor role at these excitation energies. 39 refs., 2 figs., 1 tab.

• OSTI ID: 5576151
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:44; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
BOSONS
ELECTROMAGNETIC RADIATION
ELECTRON TRANSFER
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HYDRATION
HYDROGEN COMPOUNDS
IONIZATION
LASERS
LEPTONS
MASSLESS PARTICLES
OXYGEN COMPOUNDS
PHOTOIONIZATION
PHOTONS
RADIATIONS
RADICALS
SOLVATION
ULTRAVIOLET RADIATION
WATER