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We study the bremsstrahlung radiation of a tunneling charged particle in atime-dependent picture. In particular, we treat the case of bremsstrahlungduring alpha-decay, which has been suggested as a promissing tool toinvestigate the problem of tunneling times. We show deviations of the numericalresults from the semiclassical estimates. A standard assumption of a preformedparticle inside the well leads to sharp high-frequency lines in thebremsstrahlung emission. These lines correspond to "quantum beats" of theinternal part of the wavefunction during tunneling arising from theinterference of the neighboring resonances in the well.Comment: 4 pages, 4 figure

Bremsstrahlung radiation by a tunneling particle: A time-dependent description