Thomas B Lagrange

Publications (5)21.06 Total impact

• Article: Time-resolved annular dark field imaging of catalyst nanoparticles.

  Daniel J Masiel, Bryan W Reed, Thomas B Lagrange, Geoffrey H Campbell, Ting Guo, Nigel D Browning
  ChemPhysChem 07/2010; 11(10):2088-90. · 3.41 Impact Factor
• Article: Inside Cover: Time-Resolved Annular Dark Field Imaging of Catalyst Nanoparticles (ChemPhysChem 10/2010).

  Daniel J Masiel, Bryan W Reed, Thomas B Lagrange, Geoffrey H Campbell, Ting Guo, Nigel D Browning
  ChemPhysChem 07/2010; 11(10):2050. · 3.41 Impact Factor
• Article: Electron microscopy and spectroscopy on the ultrafast timescale.

  Nigel D Browning, Geoffrey H Campbell, James E Evans, Thomas B LaGrange, Bryan W Reed
  ChemPhysChem 02/2010; 11(4):781-2. · 3.41 Impact Factor
• Source

  Available from: drexel.edu

  Article: In situ laser synthesis of Si nanowires in the dynamic TEM.

  Mitra L Taheri, Bryan W Reed, Thomas B LaGrange, Nigel D Browning
  Small 12/2008; 4(12):2187-90. · 8.35 Impact Factor
• Source

  Available from: F.V. Hartemann

  Article: Practical considerations for high spatial and temporal resolution dynamic transmission electron microscopy.

  Michael R Armstrong, Ken Boyden, Nigel D Browning, Geoffrey H Campbell, Jeffrey D Colvin, William J DeHope, Alan M Frank, David J Gibson, Fred Hartemann, Judy S Kim, Wayne E King, Thomas B LaGrange, Ben J Pyke, Bryan W Reed, Richard M Shuttlesworth, Brent C Stuart, Ben R Torralva
  [show abstract] [hide abstract]
  ABSTRACT: Although recent years have seen significant advances in the spatial resolution possible in the transmission electron microscope (TEM), the temporal resolution of most microscopes is limited to video rate at best. This lack of temporal resolution means that our understanding of dynamic processes in materials is extremely limited. High temporal resolution in the TEM can be achieved, however, by replacing the normal thermionic or field emission source with a photoemission source. In this case the temporal resolution is limited only by the ability to create a short pulse of photoexcited electrons in the source, and this can be as short as a few femtoseconds. The operation of the photo-emission source and the control of the subsequent pulse of electrons (containing as many as 5 x 10(7) electrons) create significant challenges for a standard microscope column that is designed to operate with a single electron in the column at any one time. In this paper, the generation and control of electron pulses in the TEM to obtain a temporal resolution <10(-6)s will be described and the effect of the pulse duration and current density on the spatial resolution of the instrument will be examined. The potential of these levels of temporal and spatial resolution for the study of dynamic materials processes will also be discussed.
  Ultramicroscopy 107(4-5):356-67. · 2.47 Impact Factor