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Barry I. Schneider (Fed)

Staff Physicist

Barry. I Schneider (b. 1940 in Brooklyn, New York) is a staff member of the NIST Applied and Computational Mathematics Division. In early 2014, he came to NIST as General Editor of the DLMF project after a long career at Los Alamos National Laboratory and the National Science Foundation. Schneider's current research interests span a broad number of areas of theoretical chemistry, atomic and molecular physics, numerical methods and high performance computing. His current principal focus is developing novel methods for the solution of the time dependent Schroedinger nist-equation in ultra-short, and intense laser fields. He has authored or co-authored 140 refereed papers and books and has given numerous invited talks in the US and abroad. Schneider has served as Chair and Co-Chair of the APS Division of Computational Physics and Few Body Topical group and has been the organizer of a number of conferences and invited sessions here and abroad. He also serves as a reviewer for a variety of journals inside and outside the US. In 2020 Schneider and Heman Gharibnejad, a research associate, were awarded the prize for best journal article in the Information Technology Division.  Schneider, and a small team of other NIST staff, were awarded the Department of Commerce Bronze Medal recognizing their work in transforming NIST’s infrastructure for computing in the era of data-intensive science.  The Bronze Medal is the highest recognition awarded by NIST.

Current Projects

  • General Editor - Digital Library of Mathematical Functions
  • NIST Representative to Joint Program Office - National Strategic Computing Initiative
  • Co-Chair of NITRD High End Computing Working Group
  • Associate Editor in Chief for Computers in Science and Engineering Magazine
  • Specialist Editor Computer Physics Communications
  • Numerical Solution of Time-Dependent Schroedinger Equation
  • AMPGateway

Current Professional Service

  • Past Chair of APS Division of Computational Physics
  • NIST Representative to Networking and Information Technology Research and Development High Performance Computing  Working Group
  • Chair of NIST National Strategic Computing Initiative Seminar Group

Ten Most Representative Publications

Generating solitons by phase engineering of a Bose-Einstein condensate J. Denschlag, J. E. Simsarian,  D. L.  Feder, Charles W. Clark, L. A. Collins, J. Cubizolles, L. Deng, E.W. Hagley, K. Helmerson, William P. Reinhardt, S. L. Rolston, B. I.  Schneider, William D Phillips,  Science, 287, 97 (2000)

Dark-soliton states of Bose-Einstein condensates in anisotropic traps
D. L. Feder, M. S. Pindzola, L. A. Collins, B. I. Schneider, and C. W. Clark,Phys. Rev. A62, 063606 (2000)

Nonsequential two-photon double ionization of helium, J. Feist, S. Nagele, R. Pazourek, E. Persson, B. I.  Schneider, L. A .Collins, J. Burgdoerfer, Phys. Rev. A77, 043420 (2008)

R-matrix theory for electron-molecule collisions using analytic basis set expansions. II. Electron-H2 scattering in the static-exchange model, Barry I. Schneider, Phys. Rev. A11, 1957 (1975)

Theory of vibrational excitation and dissociative attachment: an R-matrix approach, M. LeDourneuf, B. I. Schneider and P. G. Burke, J. Phys. B, 12, L365 ( 1979 )

Resonant Vibrational Excitation of N2 by Low-Energy Electrons: An Ab Initio R-Matrix Calculation, B. I. Schneider, M. Le Dourneuf, and Vo Ky Lan, Phys. Rev. Lett.  43 , 1926 (1979)

Complex Kohn variational method: Application to low-energy electron-molecule collisions, B. I. Schneider and T. N. Rescigno, Phys. Rev.  A37 3749 (1988)

Parallel solver for the time-dependent linear and nonlinear Schroedinger nist-equation, Barry I. Schneider, Lee A. Collins, and S. X. Hu, Phys. Rev., E73, 036708 (2006)

Ground and excited states of Ne2 and Ne2 plus. I. Potential curves with and without spin-orbit coupling ,James S. Cohen and Barry Schneider, J. Chem. Phys. 61, 3240 (1974)

Linear-algebraic approach to electron-molecule collisions: General formulation, L. A. Collins and B. I. Schneider, Phys. Rev. A24, 2387 (1981)


  • Awarded Poste Rouge by the CNRS (France) in 1979-1980

  • Fellow of the American Physical Society (APS) 1983

  • Alexander von Humboldt prize from the German government in 1987.

Selected Publications


ASTRA: a Transition-Density-Matrix Approach to Molecular Ionization

Luca Argenti, Juan Martín Randazzo, carlos maranthe, Jeppe Olsen, Siddhartha Chattopadhyay, Barry I. Schneider
We describe ASTRA (AttoSecond TRAnsitions), a new close-coupling approach to molecular ionization that uses many-body transition density matrices between ionic

Simulation For All: The Atomic, Molecular, and Optical Science Gateway

kathryn hamilton, klaus bartschat, nicolas douguet, sudhakar pamidighantam, robert lucchese, Barry I. Schneider
A challenge facing the Atomic, \hboxMolecular}, and Optical Science (AMOS) community is the lack of a coordinated approach to using and sharing the
Created October 9, 2019, Updated December 8, 2022