Journal
CHAOS
Volume 32, Issue 1, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0072971
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The electronic system in an atom is considered Hamiltonian only at times shorter than the spontaneous relaxation time. However, a phenomenon of nonlinear hybrid resonance can be observed in the electronic spectrum when the external electromagnetic field has a specific form.
An electronic system in an atom can be considered Hamiltonian only at times shorter than the spontaneous relaxation time. However, this time is sufficient for resonant action on the electronic system and for the implementation of the resonance inherent in Hamiltonian systems. In practice, there may be a case when it is expedient to use a hybrid approach to study nonlinear resonance, in which the classical theory can be used to calculate the action-dependent nonlinear resonance frequency, and the quantum theory can be used to calculate its correction. The use of such a hybrid approach becomes necessary when the resonant value of the action does not exceed Planck's constant many times. It is shown in the work that if the external electromagnetic field has the form of a periodic series of light pulses with a high duty cycle, then the phenomenon of nonlinear hybrid resonance leads to the appearance of a line in the low-frequency region of the electronic spectrum. The broadening of this line is determined using the rms quantum fluctuations.
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