PIRSA:18030070

Video URL

https://pirsa.org/18030070

The Chemical Imagination at Work in VERY Tight Places

Hoffmann, R. (2018). The Chemical Imagination at Work in VERY Tight Places. Perimeter Institute for Theoretical Physics. https://pirsa.org/18030070

Hoffmann, Roald. The Chemical Imagination at Work in VERY Tight Places. Perimeter Institute for Theoretical Physics, Mar. 28, 2018, https://pirsa.org/18030070 

          @misc{ scivideos_PIRSA:18030070,
            doi = {10.48660/18030070},
            url = {https://pirsa.org/18030070},
            author = {Hoffmann, Roald},
            keywords = {Other Physics},
            language = {en},
            title = {The Chemical Imagination at Work in VERY Tight Places},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2018},
            month = {mar},
            note = {PIRSA:18030070 see, \url{https://scivideos.org/index.php/pirsa/18030070}}
          }

Roald Hoffmann Cornell University

Talk numberPIRSA:18030070
DOI10.48660/18030070
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Diamond anvil cells and shock techniques now permit the study of matter under multimegabar (i.e. several hundred GPa) pressures. The properties of matter in this pressure regime differ drastically from those known at 1 atm. Just how different physics and chemistry are at high pressure and the role that a chemical intuition for bonding and structure can have in understanding matter at high pressures will be explored in this lecture. I will discuss in detail an overlapping hierarchy of responses to increased density, consisting of (a) squeezing out van der Waals space (for molecular crystals); (b) increasing coordination; (c) decreasing the bond length of covalent bonds and the size of anions; and (d) an extreme regime of electrons moving off atoms and new modes of correlation. Examples of the startling chemistry and physics that emerge under such extreme conditions will alternate in this account with qualitative chemical ideas about the bonding involved.