The 2D-Raman-THz response in all possible time-orderings (Raman-THz-THz, THz-Raman-THz, and THz-THz-Raman) of amorphous water ice is calculated in two ways: from atomistic molecular dynamics simulations and with the help of a Feynman diagram model, the latter of which power-expands the potential energy surface and the dipole and polarizability surfaces up to leading order. Comparing both results allows one to dissect the 2D-Raman-THz response into contributions from mechanical anharmonicity, as well as electrical dipole and polarizability anharmonicities. Mechanical anharmonicity dominates the 2D-Raman-THz response of the hydrogen-bond stretching and hydrogen-bond bending bands of water, and dipole anharmonicity dominates that of the librational band, while the contribution of polarizability anharmonicity is comparably weak. A distinct echo of the hydrogen-bond stretching band is observed for the THz-Raman-THz pulse sequence, again dominated by mechanical anharmonicity. A peculiar mechanism is discussed, which is based on the coupling between the many normal modes within the hydrogen-bond stretching band and which will inevitably generate such an echo for an amorphous structure.
Skip Nav Destination
Article navigation
28 July 2020
Research Article|
July 28 2020
A Feynman diagram description of the 2D-Raman-THz response of amorphous ice
David Sidler;
David Sidler
Department of Chemistry, University of Zurich
, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
Search for other works by this author on:
Peter Hamm
Peter Hamm
a)
Department of Chemistry, University of Zurich
, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
a)Author to whom correspondence should be addressed: peter.hamm@chem.uzh.ch
Search for other works by this author on:
a)Author to whom correspondence should be addressed: peter.hamm@chem.uzh.ch
J. Chem. Phys. 153, 044502 (2020)
Article history
Received:
June 15 2020
Accepted:
July 07 2020
Citation
David Sidler, Peter Hamm; A Feynman diagram description of the 2D-Raman-THz response of amorphous ice. J. Chem. Phys. 28 July 2020; 153 (4): 044502. https://doi.org/10.1063/5.0018485
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Pay-Per-View Access
$40.00
Citing articles via
DeePMD-kit v2: A software package for deep potential models
Jinzhe Zeng, Duo Zhang, et al.