We discuss the hybrid 2D-Raman-THz spectroscopy of liquid water. This two-dimensional spectroscopy is designed to directly work in the low-frequency range of the intermolecular degrees of freedom. The information content of 2D-Raman-THz spectroscopy is similar to 2D-Raman or 2D-THz spectroscopy, but its experimental implementation should be easier. That is, 2D-Raman-THz spectroscopy is a 3rd-order nonlinear spectroscopy and as such completely avoids cascading of consecutive 3rd-order signals, which turned out to be a major difficulty in 5th-order 2D-Raman spectroscopy. On the other hand, it does not require any intense THz pump-pulse, the lack of which limits 2D-THz spectroscopy to the study of semiconductor quantum wells as the currently available pulse energies are too low for molecular systems. In close analogy to 2D-Raman spectroscopy, the 2D-Raman-THz response of liquid water is simulated from an all-atom molecular dynamics simulation, and the expected spectral features are discussed.
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7 March 2012
Research Article|
March 07 2012
Two-dimensional-Raman-terahertz spectroscopy of water: Theory
Peter Hamm;
Peter Hamm
a)
Physikalisch-Chemisches Institut,
Universität Zürich
, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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Janne Savolainen
Janne Savolainen
Physikalisch-Chemisches Institut,
Universität Zürich
, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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a)
Electronic mail: phamm@pci.uzh.ch.
J. Chem. Phys. 136, 094516 (2012)
Article history
Received:
November 21 2011
Accepted:
February 15 2012
Citation
Peter Hamm, Janne Savolainen; Two-dimensional-Raman-terahertz spectroscopy of water: Theory. J. Chem. Phys. 7 March 2012; 136 (9): 094516. https://doi.org/10.1063/1.3691601
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