Electron-Enhanced Vibrational Spectroscopy: A Theoretical Approach

Electron Enhanced Raman Scattering and Its Applications in Solution Chemistry

“…An enhancement factor of the water molecules-electron system with Gaussian 03 (DFT, 6-31G ++ , B3LYP) was estimated as 10 3 -10 5 . 7 We confirmed the electron enhancement effect from the disappearance of such characteristic signals in the presence of electron scavenger (H2O2) in the system. Such electron-rich water environment was considered to last for several tens of picoseconds until the liquid water was transferred to the plasma (gas) phase by the heating with the following laser pulse.…”

Characteristic wavenumber shifts of the stimulated Raman scattering from interfacial water molecules induced by laser‐induced plasma generation at air–water and water–silver interfaces

“…11 In EERS, molecular polarizability itself is modulated by the local but strong electrostatic fields induced by the adjacent excess electrons, leading to Raman enhancement. 12 We found such anomalous Raman enhancement effects when a laser-induced plasma was generated in liquid water. 13,14 The enhancement takes place when excess electrons are generated and drastically increased by avalanche ionization in liquid water and before the phase transition from liquid water to plasma.…”

Hydrated-electron resonance enhancement O–H stretching vibration of water hexamer at air–water interface

“…2-3, is intense Raman scattering, and belongs to one type of resonance Raman effect [44]. The estimated Raman enhancement factor was about 200 times larger than that of neutral species when an e − aq was detached [7]. Three reasons affirm that the Raman peak at 3595 cm −1 belongs to e − aq s resonance enhancement O-H stretching vibration of the water hexamer.…”

“…LIB is a complex process that produces various optical, electronic, thermal, and structural effects [6]. Excess electrons generated by LIB affect the hydrogen bond network structure of water cluster and change the cluster number and polarizability, resulting in anomalous Raman peak appearances [7]. Simultaneously, excess electrons are injected into the hydrogen bond network of the water cluster [8] and form the hydrated electron (e − aq ), a fundamental species to many areas of physical science, and play a key role in aqueous phase chemistry, upper atmosphere, and organic chemistry [9].…”