Dear all,
This is going to be very relevant to the group and worth the hike up to
Garden street. I hope to see you guys there.
Alan
Alán Aspuru-Guzik | Professor of Chemistry and Chemical Biology
Harvard University | 12 Oxford Street, Room M113 | Cambridge, MA 02138
(617)-384-8188 |
http://aspuru.chem.harvard.edu |
http://about.me/aspuru
On Mon, May 12, 2014 at 1:09 PM, Cynthia M. Chew <
aspuru-assistant(a)chemistry.harvard.edu> wrote:
Hi group,
A reminder that the ITAMP/CCB seminar is happening in less than 1hr!
2pm
Phillips Auditorium
60 Garden Street, Center for Astrophysics
Dr. Rob DiStasio
Princeton University
“The Microscopic Structure, Equilibrium Density, and Local Environment of
Liquid Water"
In this work, we have performed extensive density functional theory (DFT)
based ab initio molecular dynamics (AIMD) simulations of liquid water at
ambient conditions in both the canonical (NVT) and isothermal-isobaric
(NpT) ensembles to investigate the individual and collective importance of
exact exchange, non-local van der Waals (dispersion) interactions, and
nuclear quantum effects on the structural properties of liquid water. AIMD
simulations which systematically account for these effects result in
structural properties (like the oxygen-oxygen radial distribution function)
which are in excellent agreement with experiment and a liquid water having
an equilibrium density within a few percent of the experimental value of
approximately 1 g/cm3. A detailed analysis of the local environment in
ambient liquid water has revealed that individual water molecules naturally
fluctuate between spatially high- and low-density environments and the
corresponding inherent potential energy surface (IPES) is bimodal,
consistent with the existence of polymorphism in the amorphous phases of
water. With these findings, the methodology presented herein overcomes the
well-known limitations of semi-local DFT and provides a detailed and
accurate microscopic description of ambient liquid water.
Best,
Cynthia
Cynthia M. Chew
Faculty Assistant | Aspuru-Guzik Research Group
Department of Chemistry and Chemical Biology | Harvard University
12 Oxford Street | Mallinckrodt 112 | Cambridge, MA 02138
617.496.1716 office | 617.496.9411 fax
http://aspuru.chem.harvard.edu/
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