Abstract
The electroreflectance spectra (ES) of polycrystalline gallium in alkali solutions have two bands of charge transfer (BCT) from adsorbed water molecules to metal. The energy of one band equals about 4.6 eV and is potential-independent, which points to the presence of water molecules with a zero charge transfer at the metal surface. The energy of the other is lower and drops with increasing potential, which points to the absence of decomposition of adsorbed water to OH_ groups. The plasma ES on gallium is determined largely by mechanism governing electromodulation of the concentration of the surface anion centers where the metal’s free electrons are scattered. The mechanism provides the ES intensity commensurate with that of the water BCT
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