Probing Lattice Dynamics Pampa Devi April 29,2009.

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Presentation transcript:

Probing Lattice Dynamics Pampa Devi April 29,2009

Bragg Law Pump Probe Set Up Velocity Mismatch Problem Way to overcome it Go Through….

Bragg Law W. L. Bragg presented a simple explanation of the diffracted beams from a crystal based on a reflection from planes of atoms. d { dsin    The difference in the paths traversed by the two beams shown in the figure is: 2dsin  = n

X-Ray diffraction Electron Diffraction

Pump Probe Photography

Au Powder Diffraction

8 Committee Meeting # 2 Seeing is believing.. Hard to see …  Ruan et al.

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Accessories : Peter Baum and Ahmed H. Zewail No excitation Excitation After Excitation

Passing through a grating does the job…

Implementation