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Controlled Nanoscale Mechanical Phenomena Discovered with Ultrafast Electron Microscopy

Authors

  • David J. Flannigan Dr.,

    1. Physical Biology Center for Ultrafast Science and Technology, California Institute of Technology, Pasadena, CA 91125, USA, Fax: (+1) 626-792-8456
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  • Vladimir A. Lobastov Dr.,

    1. Physical Biology Center for Ultrafast Science and Technology, California Institute of Technology, Pasadena, CA 91125, USA, Fax: (+1) 626-792-8456
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  • Ahmed H. Zewail Prof. Dr.

    1. Physical Biology Center for Ultrafast Science and Technology, California Institute of Technology, Pasadena, CA 91125, USA, Fax: (+1) 626-792-8456
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  • This work was supported by the Gordon and Betty Moore Foundation, the Air Force Office of Scientific Research, and the National Science Foundation. We wish to thank the referees for insightful comments.

Abstract

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On again, off again: The reversible expansion and contraction of single crystals of [Cu(TCNQ)] induced by near-infrared laser pulses was studied with ultrafast electron microscopy (TCNQ=7,7,8,8-tetracyanoquinodimethane). The crystal expands along the π-stacking axis of the TCNQ molecules, but not perpendicular to this axis, when exposed to light. The crystal returned to its original structure when the laser light was blocked.

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