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Recent experimental results of the Doppler effect formula verification are reported. The moving emitter is hydrogen atoms in excited state, obtained in disintegration of accelerated H⁺₃ ions. The results of the work corroborate the classical, not the relativistic, formula for the Doppler effect.

The paper reports measurement of the Doppler effect in the same way as on previous occasions [1. 2], but in the present series of experiments the working space is filled with nitrogen rather than hydrogen. The previous conclusion, that the Doppler effect is correctly expressed by the classical, not by the relativistic formula, is again confirmed.

The paper reports measurements of the Doppler effect asymmetry as a function of the observation angle. The experimental results show that the various formulas proposed to describe the Doppler effect, only the formula [] is correct.

The paper critically examines the experiments checking the Doppler effect formula in the form []. A series of measurements was performed using accelerators imparting energies of up to 2,000 keV to hydrogen ions and observing the spectral Doppler shift at angles of 77^o and 257^o from the direction of motion. Special attention was paid to the effect of the hydrogen pressure and other influences that may not have been fully appreciated in previous experiments. The results demonstrate that the classical formula for the Doppler effect [] is valid. But it is shown that a rigorous relativistic analysis yields the same result.