Abstract

Raman scattering of the O–H stretching vibration mode inside water, as well as near and at the air–water interface, was investigated by laser-induced breakdown (LIB). An intense and characteristic higher wavenumber Raman shift of the O–H vibration was observed at the air–water interface, which was attributed to the hydrated-electron resonance enhancement of the O–H stretching vibration mode of water hexamer. The hydrated electron in the water hexamer structure was formed by excess electrons injected into the gas-like phase with low hydrogen bond order under LIB. The electron-phonon coupled mechanism was discussed.

© 2015 Optical Society of America

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