There were plenty of interesting and important publications during 90s, I will list them here:
Frederick H. Long, Hong Lu, Xuelong Shi, Kenneth B.Eisenthal Femtosecond studies of electron photodetachment from an iodide ion in solution: The trapped electron Chemical Physics Letters 1990, 169, 165-171; doi.org/10.1016/0009-2614(90)85182-C
Wet electron term never settled in the literature, presolvated electron is knowdays is widely accepted.
Y. Gauduel, S. Pommeret, A. Migus, N. Yamada, and A. Antonetti Femtosecond spectroscopy of an encounter pair radical (H3O+..e–)hyd in concentrated aqueous solution J. Am. Chem. Soc. 1990, 112, 2925–2931; doi.org/10.1021/ja00164a013
Y. Gauduel, S. Pommeret, A. Migus, A. Antonetti Some evidence of ultrafast H2O+-water molecule reaction in femtosecond photoionization of pure liquid water: Influence on geminate pair recombination dynamics Chemical Physics 1990, 149, 1-10; doi.org/10.1016/0301-0104(90)80126-I
Frederick H. Long, Hong Lu, and Kenneth B. Eisenthal Femtosecond Studies of the Presolvated Electron: An Excited State of the Solvated Electron? Phys. Rev. Lett. 1990, 64, 1469; doi.org/10.1103/PhysRevLett.64.1469
Resume : These are the first genuine attempts to understand the electron solvation mechanism using time-resolved femtosecond spectroscopy, reconstructing the absorption spectra of presolvated and solvated electrons.
Y. Gauduel, S. Pommeret; A. Migus and A. Antonetti Hydrogen/Deuterium Isotope Effects on Femtosecond Electron Reactivity in Aqueous Media J . Phys. Chem. 1991, 95, 533-539; doi.org/10.1021/j100155a010
S. Pommeret, A. Antonetti and Y. Gauduel Electron Hydration in Pure Liquid Water. Existence of Two Nonequilibrium Configurations in the Near-Infrared Region J . Am. Chem. Soc. 1991, 113, 9105-9111; doi.org/10.1021/ja00024a012
Frederick H.Long, Hong Lu, Xuelong Shi and Kenneth B.Eisenthal Intensity dependent geminate recombination in water Chemical Physics Letters 1991, 185, 47-52; doi.org/10.1016/0009-2614(91)80137-M
Articles propose more complicated schemes of excess electron solvation, including encounter pairs, different excess electrons, geminate recombination…The attention towards the difference between the photo and high-energy particles ionization.
C. Pepin, D. Houde, H. Remita, T. Goulet and J.-P. Jay-Gerin Evidence for resonance-enhanced multiphoton ionization of liquid water using 2 eV laser light: Variation of hydrated electron absorbance with femtosecond pulse intensity Phys. Rev. Lett. 1992, 69, 3389; doi.org/10.1103/PhysRevLett.69.3389
The actual process of water photoionization was raised.
Y. Gauduel, S. Pommeret and A. Antonetti Early formation of electron-radical pairs in a polar protic liquid: evidence of ultrafast concerted electron-proton transfers J. Phys. Chem. 1993, 97, 134–142; doi.org/10.1021/j100103a024
C. Pepin, T. Goulet, D. Houde and J.-P. Jay-Grin Femtosecond Kinetic Measurements of Excess Electrons in Methanol: Substantiation for a Hybrid Solvation Mechanism J. Phys. Chem. 1994, 98, 7009–7013; doi.org/10.1021/j100079a020
Hybrid mechanism: the continuous shift is proposed for the methanol solvation case.
Y. Kimura, Joseph C. Alfano, P. K. Walhout and Paul F. Barbara Ultrafast Transient Absorption Spectroscopy of the Solvated Electron in Water J. Phys. Chem. 1994, 98, 3450–3458; doi.org/10.1021/j100064a029
Barbara proposes two-state electronic relaxation for excess electron but adds ground-state relaxation dynamics. Well written description of electron solvation. Blue-shift observed.
J.L. McGowen, H.M. Ajo a, J.Z. Zhang and Benjamin J. Schwartz Femtosecond studies of hydrated electron recombination following multiphoton ionization at 390 nm Chemical Physics Letters 1994, 231, 504-510; doi.org/10.1016/0009-2614(94)01281-4
1995 doi.org/10.1016/0009-2614(94)01314-L; doi.org/10.1021/j100018a024
Electron Solvation in Neat Alcohols.
Xuelong Shi, Frederick H. Long, Hong Lu and Kenneth B. Eisenthal Femtosecond Electron Solvation Kinetics in Water J. Phys. Chem. 1996, 100, 11903–11906; doi.org/10.1021/jp961261r
A. Reuther, A. Laubereau and D. N. Nikogosyan Primary Photochemical Processes in Water . Phys. Chem. 1996, 100, 16794–16800; doi.org/10.1021/jp961462v
Models of solvated electron formation in water, geminate recombination, etc.