Direct observation of the transversal Doppler-shift

@article{Hasselkamp1979DirectOO,
  title={Direct observation of the transversal Doppler-shift},
  author={Dietmar Hasselkamp and E. Mondry and Arthur Scharmann},
  journal={Zeitschrift f{\"u}r Physik A Atoms and Nuclei},
  year={1979},
  volume={289},
  pages={151-155}
}
An experiment is reported in which the second order Doppler-shift has been determined by the observation of theHα-line emitted by linearly moving hydrogen atoms of velocities 2.53×108 cm/s−9.28×108 cm/s. In contrast to previous experiments the direct transversal observation has been used for the first time. The coefficient of the second order term in the relativistic approximation is found to be 0.52±0.03 which compares good with the theoretical value of 1/2. 
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Dieses Buch gibt eine EinfUhrung in die Physik, aber es ist kein Lehrbuch entweder nur der Experimentalphysik oder der theoretischen Physik im herkommlichen Sinn. Die Physik wird hier als Einheit
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