Enhanced Stimulated Raman Scattering by a Pressure-Controlled
Shock Wave in Liquid Water
Version 2 2019-08-23, 21:13
Version 1 2019-08-09, 15:37
Posted on 2019-08-23 - 21:13
Stimulated
Raman scattering (SRS) is observed using a Nd:YAG laser
in liquid water at both forward and backward directions under different
pressures. The spectra at atmospheric pressure and high pressure exhibit
different characteristic features. For high pressure, the main SRS
peak (about 3400 cm–1) of liquid water shifts to
low frequency. Interestingly, a new peak is observed in both directions.
The position of the new peak is lower than that at atmospheric pressure,
which belongs to strong hydrogen bonds. Especially, a low peak is
obtained at around 3140 cm–1 in the backward direction
at 400 MPa, indicating the formation of an ice-like structure. In
addition, the normalized SRS intensity of high pressure is higher
than that of atmospheric pressure. These results indicate that high
pressure can significantly enhance the SRS of water molecules. The
enhancement mechanism is attributed to the long duration and slightly
slow velocity of the shock wave induced by high pressure.
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Li, Fabing; Wang, Ying; Li, Zhanlong; Men, Zhiwei; Sun, Chenglin (2019). Enhanced Stimulated Raman Scattering by a Pressure-Controlled
Shock Wave in Liquid Water. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b01956
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AUTHORS (5)
FL
Fabing Li
YW
Ying Wang
ZL
Zhanlong Li
ZM
Zhiwei Men
CS
Chenglin Sun