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1996, Richard I. Masel, Principles of Adsorption and Reaction on Solid Surfaces, Wiley, page 148:
The case of hydronium ions (H3O+) is an example of this. In the gase phase, hydronium is a weak acid. The data in Table 3.10 indicates that bare hydronium ions have a higher electron affinity than most metal surfaces, so a bare hydronium ion should be neutralized when it absorbs on a bare metal surface. However, a hydrated hydronium ion is a stronger acid.
Acids are compounds that produce hydronium ions when mixed with water.[…]The hydronium ion is a very special ion because it is the defining particle of all acids.
2016, Philippe Deprez, Textbook of Chemical Peels: Superficial, Medium, and Deep Peels in Cosmetic Practice, 2nd edition, Taylor & Francis (CRC Press), page 48:
Hydronium is not a way of stabilizing an acid, because the structure itself is so quickly transient that it can be considered as not existing.
2016, Andrés G. Muñoz, Photoelectrochemical Solar Conversion Systems: Molecular and Electronic Aspects, Taylor & Francis (CRC Press), page 206:
There is experimental evidence for the formation of coordination groups of hydroniums with several water molecules by hydrogen bridges.
Usage notes
May also be defined as the simplest of a class of oxygen cations with three bonds (i.e., the simplest form of oxonium).
Self-ionization of water on Wikipedia.Wikipedia 