Open AccessMeasurement of the speed of X‐rays
Author(s) -
Zolotoyabko E.,
Quintana J. P.
Publication year - 2002
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049502002315
Subject(s) - physics , optics , materials science , environmental science
X‐ray pulses from the Advanced Photon Source at Argonne National Laboratory were used to measure the speed of X‐rays in the energy range between 21 and 60 keV. An LiNbO 3 ‐based 0.58 GHz surface acoustic wave device served as a temporal analyzer in the stroboscopic time‐resolved diffraction measurements. By synchronizing the surface acoustic wave excitation and periodic X‐ray illumination of the LiNbO 3 crystal, the temporal modifications in the LiNbO 3 diffraction profiles could be followed and the time points of X‐ray arrivals at the analyzer position for different analyzer to storage ring distances determined. The speed of the X‐rays was determined as the ratio of measured spacings and corresponding delay time intervals. Within the experimental error bars, the obtained X‐ray velocities converged to the tabulated constant for the speed of light in a vacuum.