The particle internal clock conjectured by de Broglie in 1924 was investigated in a channeling experiment using a beam of ∼80 MeV electrons aligned along the 110 direction of a 1 μm thick silicon crystal. Some of the electrons undergo a rosette motion, in which they interact with a single atomic row. When the electron energy is finely varied, the rate of electron transmission at 0°shows a 8% dip within 0.5% of the resonance energy, 80.874 MeV, for which the frequency of atomic collisions matches the electron's internal clock frequency. A model is presented to show the compatibility of our data with the de Broglie hypothesis.In a previous publication [1], we showed data which can be interpreted as a manifestation of the particle internal clock postulated by L. de Broglie in 1924. In the present paper we shall report again this result in the light of a phenomenological calculation that we used as a guide to design the experiment and understand its significance.At the beginning of quantum mechanics, L. de Broglie [2, 3] associated a particle of mass m 0 in its rest frame with an internal frequency ν 0 = m 0 c 2 /h and a wave

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