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wave packet occurs when the x­ray wave packet passes through the deformed region in the crystal (green dottedbox) with the incident angle nearby the Bragg angle. (b) Schematic of one of the trajectories with the x­ray wave
vector and the group velocity. (c) A special case of (b) where the edge of the deformed region is identical to thesample edge.

154  úËõ May 2011 Vol.24 No.3

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measured with a Fizeau visible interferometer. Green ovals show the size (in FWHM) and the positions of the il­luminated x­ray beam spots (BS1 and BS2). (c) Surface height distribution along BS1­BS2­crystal edge (redcurve). The crystal plane is assumed to be parallel to the linear t to the measured surface height distribution. The
deviation of the red line from a linear t at BS1 (usurface) is represented by a blue curve. The amount of the defor­
mation at the crystal edge (u), thus estimated, was approximately 0.2 mm.

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Enhanced translation of x­ray wavepacket
inside silicon deformed crystal
Yoshiki KOHMURAKei SAWADA
Tetsuya ISHIKAWA

RIKEN, SPring­8 Center
1_1_1, Kouto, Sayo­cho, Sayo­gun, Hyogo 679_5148 JapanRIKEN, SPring­8 Center
1_1_1, Kouto, Sayo­cho, Sayo­gun, Hyogo 679_5148 JapanRIKEN, SPring­8 Center
1_1_1, Kouto, Sayo­cho, Sayo­gun, Hyogo 679_5148 Japan

Abstract We report an enhanced translation of x­rays over huge distances due to an atomic displacement ina silicon crystal. This result supports a prediction in 2006 by the dynamical diraction theory including a Berry­phase eect. We present the mechanism of the gigantic translation and its experimental verication.

úËõ May 2011 Vol.24 No.3  157