Multiphoton ionization of liquid water with 3.0-5.0 eV photons

Journal Article · Thu Nov 07 04:00:00 EST 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp9610978· OSTI ID:420741

Crowell, R A; Bartels, D M ^[1]

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1. Argonne National Lab., IL (United States)

We report a picosecond laser study of the transient absorption of hydrated electrons generated by 3-5 eV multiphoton ionization of liquid water. The geminate kinetics indicate that e{sub aq}{sup -} is produced by at least three different mechanisms over this energy range. Power dependence of the signal amplitude shows a two-photon threshold for 4.0 eV excitation and a three-photon threshold absorption at 3.47 eV, consistent with two- or three-photon excitation of the A({sup l}B{sub l}) lowest excited state. Here the geminate kinetics are interpreted in terms of the three-body (OH, H{sub 3}O{sup +}, e{sub aq}{sup -}) diffusion model developed by Pimblott. Then the present results are compared with previous work and the model calculations. Present understanding of the one-photon liquid water spectrum is discussed and the multiphoton ionization results are interpreted. A new mechanism is proposed for the production of e{sub aq}{sup -} at photon energies well below the conduction band. 55 refs., 11 figs.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 420741
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 45 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
42 ENGINEERING
99 GENERAL AND MISCELLANEOUS
ABSORPTION SPECTRA
ATOMS
BORN-OPPENHEIMER APPROXIMATION
COMPUTERIZED SIMULATION
DECAY
DIFFUSION
EXCITED STATES
HYDROGEN
HYDROXYL RADICALS
LASER SPECTROSCOPY
PHOTOIONIZATION
PROBABILITY
RECOMBINATION
ULTRAVIOLET SPECTRA
WATER