Abstract
A method for measuring tiny differences between spectral line wave lengths is described. The light signals of two close spectral lines are registered, using rotating mirrors and a photomultiplier placed on the cathode ray oscilloscope, as two signals with time interval Δt which, with other conditions held constant, depends on the difference between the spectral line wave lengths Δλ. This method can be used to measure the velocity of excited atoms or ions. By suitable illumination of the spectrograph, using a source with ordered motion of atoms or ions, we obtain two spectral lines whose wave lengths are shifted due to the Doppler effect. By measuring this shift, the velocity of the particles can be found. This method has been proved experimentally using the Fe arc as light source.
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