David Chin

  • Program Year: 2
  • Academic Institution: University of Rochester
  • Field of Study: Physics
  • Academic Advisor: Gilbert 'Rip' Collins
  • Practicum(s):
    Sandia National Laboratories, New Mexico (2021)
  • Degree(s):
    B.S. Physics, State University of New York at Geneseo, 2017

Summary of Research

For my research, I am using X-Ray Absorption Fine Structure (XAFS) spectroscopy to understand the behavior of iron and iron oxides under planetary core conditions. Planetary cores reach interior conditions of millions to billions of atmospheres, conditions previously inaccessible to laboratory experiments. At these extreme pressures, the energy density is comparable to that of traditional chemical bonds causing interior electron orbitals to be distorted and core electrons to participate in bonding. Consequently, chemical rules are very different for matter in the deep interiors of such planets that reach atomic pressures.
XAFS spectroscopy is sensitive to the complex chemistry that occurs at these extreme energy densities. XAFS uses the modulations in the absorption coefficient, produced by the interaction of the excited photoelectron with the surrounding material, to understand the chemical and physical state of the atom. By extracting the radial distribution function from the XAFS modulations, we gain information about the density and local order. Furthermore, the variation, produced by thermal vibrations, in the interatomic positions cause a damping in the amplitude of the modulations, from which we can estimate the thermal behavior of the compressed material. Lastly, we expect are developing a high-resolution spectrometer to infer solid liquid melting and electron orbital hybridization from the near edge region of the absorption spectrum. These research goals will be achieved at the Laboratory for Laser Energetics.

Publications

Publications:

J.J. Ruby, J.R. Rygg, D.A. Chin, J.A. Gaffney, P. Adrian, C.J. Forrest, V.Yu. Glebov, N.V. Kabadi, P.M. Nilson, Y. Ping, C. Stoeckl, and G.W. Collins; Energy Flow in Thin Shell Implosions and Explosions, Physical Review Letters 125, 215001 (2020).

J.J. Ruby, J.R. Rygg, D.A. Chin, J.A. Gaffney, P. Adrian, D. Bishel, C.J. Forrest, V.Yu. Glebov, N.V. Kabadi, P.M. Nilson, Y. Ping, C. Stoeckl and G.W. Collins; Constraining Physical Models at Gigabar Pressures, Physical Review E 102, 053210 (2020).

B. Henderson, M.C. Marshall, T.R. Boehly, R. Paul, C. McCoy, S.X. Hu, D.N. Polsin, L. Crandall, M. Huff, D.A. Chin, J.J. Ruby, X. Gong, D.E. Fratanduono, J.H. Eggert, J.R. Rygg and G.W. Collins; Shock-Compressed Silicon: Hugoniot and Sound Speed to 2100 GPa, Submitted to Physical Review B.

Talks:

D.A. Chin, P.M. Nilson, J.J. Ruby, X. Gong, M.K. Ginnane, B. Henderson, L. Crandall, D.N. Polsin, G.W. Collins, T.R. Boehly, J.R. Rygg, D. Trail, A. Amouretti, M. Harmand, R. Torchio, F. Coppari, A. Coleman, Y. Ping; Using X-Ray Absorption Spectroscopy to Study Iron Oxides at Extreme Compressions. APS Division of Plasma Physics; Virtual Event. 2020.

D.A. Chin, P.M. Nilson, J.J. Ruby, X. Gong, D.N. Polsin, G.W. Collins, T.R. Boehly, J.R. Rygg, Y. Ping, F. Coppari, D. Trail, A. Amouretti, M. Harmand; An Extended X-Ray Absorption Fine Structure Spectroscopy Study of Iron Oxides. APS Topical Group on Shock Compression of Condensed Matter; Portland, OR. 2019.

Poster Presentations:

D.A. Chin, P.M. Nilson, G.W. Collins, T.R. Boehly, J.R. Rygg, Y. Ping, F. Coppari, D. Trail, I. Szumila, M. Harmand; Interpreting EXAFS: Toward Ramp-Compression Studies of Iron Oxide. APS Division of Plasma Physics; Portland, OR. 2018.

D.A. Chin, P.M. Nilson, G.W. Collins, T.R. Boehly, J.R. Rygg, Y. Ping, F. Coppari; Interpreting EXAFS: Toward Ramp-Compression Studies of Iron Oxide. Gordon Research Conference; Holderness, NH. 2018.

Awards

Susumu Okubo Prize (University of Rochester): Spring 2019

Masters of the Arts in Physics (University of Rochester): Winter 2018

Robert Marshak Graduate Research Fellowship (University of Rochester): Fall 2017

President's List at SUNY Geneseo: Fall 2012- Spring 2017

Summa cum Laude (SUNY Geneseo)

Award for Excellence in Mathematics (SUNY Geneseo): Spring 2017

The Susan McKenna Award (SUNY Geneseo): Spring 2017

Barry M. Goldwater Scholarship Honorable Mention: Spring 2016

The Physics/Astronomy Alumni Award (SUNY Geneseo): Spring 2016

The John W. Padalino Physics or Engineering Research Award (SUNY Geneseo): Spring 2016

Robert Duke Sells Memorial Endowed Scholarship (SUNY Geneseo): Spring 2015

Geneseo Alumni Fellow Annual Scholarship (SUNY Geneseo): Spring 2014

Ed Curry '96 Memorial Endowed Scholarship (SUNY Geneseo): Spring 2014