Amplification of O-D stimulated Raman scattering in DMSO-D2O solution via intense laser-driven electron transfer

In this study, we investigated in detail the regulation mechanism of electron transfer under laser-induced breakdown (LIB) on weak O–D stimulated Raman scattering (SRS) in DMSO–D 2 O solutions. Significantly, the Raman activity of O–D vibrations was greatly enhanced by two orders of magnitude due to electron transfer in DMSO molecules. Density functional theory (DFT) calculations showed that the O–D Raman activity was significantly enhanced in the DMSO–D 2 O dimer compared to the D 2 O dimer. Additionally, the high-order (third-order) SRS peaks originating from the O–D vibration and the characteristic peaks representing the ice-like structure were detected, which were due to the Raman-enhanced four-wave mixing (FWM) process induced by the hydrated electron and intramolecular electron transfer. It was hoped that our results could provide a meaningful reference for the development of multi-wavelength and significant frequency-shifted Raman lasers.