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宁夏师范学院学报

Influence of Detuning on the Ionization Photoelectron Spectra in Excitation-ionization Scheme

Liu Birui

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

The influence of the detuning on the properties of a two-photon ionization photoelectron spectrum in an excitation-ionization scheme under a frequency-modulated field is studied theoretically by means of the perturbation theory and numerical calculation method.It is shown that the photoelectron spectra can be modulated by the frequency detuning.This modulation is based on the selective population of dressed states(SPODS) of the excited state,and the positive detuning is propitious to the selective population on the lower dressed state,while the negative detuning leads to the selective population in the upper dressed state.

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The influence of the detuning on the properties of a two-photon ionization photoelectron spectrum in an excitation-ionization scheme under a frequency-modulated field is studied theoretically by means of the perturbation theory and numerical calculation method.It is shown that the photoelectron spectra can be modulated by the frequency detuning.This modulation is based on the selective population of dressed states(SPODS) of the excited state,and the positive detuning is propitious to the selective population on the lower dressed state,while the negative detuning leads to the selective population in the upper dressed state.
Properties of the two-photon ionization photoelectron spectra in excitation-ionization scheme by frequency-modulated fields are studied by means of perturbation theory and numerical calculation method.The influences on the photoelectron spectra by the modulated amplitude,the modulated frequency,and the initial phase of the frequency-modulated field and the detuning are discussed under strong-field mechanism.It is shown that the photoelectron spectra can be modulated by the modulated amplitude,the modulated frequency,the initial phase and the detuning.Quantum control of the photoelectron spectra can be realized by those parameters.Mechanism of quantum coherent control in this system is monitoring the selective population of dressed states(SPODS).
The properties of the photoelectron spectra in two resonant multi-photon ionization process are studied by means of dressed state theory and perturbation theory.The influences on the photoelectron spectra by the area of the first pulse and the delay between two pulses are discussed under strong-field scheme.It is shown that the photoelectron spectra can be modulated by the areas of the two pulses and the delay between them.Control of Autler-Townes doublet and the interferences in doublet can be realized by the area of the first pulse and the delay between the two pulses.The selective population of dressed states(SPODS)also can be realized by this coherent quantum mechanism.The population of dressed states cannot be selected by the area of the second pulse,but obviously it can be modulated.
The dynamics of the bound-state populations and the photoelectron spectra are calculated for model atomic systems irradiated by a pulse with a harmonically modulated frequency. For a system including a single bound state a model is adopted, which takes into account the threshold behavior typical of negative ions and admits continuum-continuum transitions. For a model one-dimensional atom the results are obtained through a numerical integration of the Schr\"odinger equation. The case of a resonant ionization is also considered. The modulation of the frequency results in changing the instantaneous rate of decay of the initial state, in inducing additional population oscillations for multilevel systems, and in additional peaks in the photoelectron spectra.
A theoretical analysis of the phase control of a two-channel atomic ionization scheme is given. We report results on phase-selective excitation, both with square and smooth laser pulses. We show that the phenomenon of population trapping, which is known to occur in this system, can be greatly influenced by the phase difference of the lasers involved in the excitation. As a result, the time dependences of the ionization probability, the populations in the bound states and the form of the photoelectron energy spectra can all be controlled by varying the phase difference of the lasers. We also show that for specific atomic and phase parameters population can be entirely trapped within a superposition state, totally immune to decay, with no ionization whatsoever.
A theoretical analysis of the phase control of a two-channel atomic ionization scheme is given. We report results on phase-selective excitation, both with square and smooth laser pulses. We show that the phenomenon of population trapping, which is known to occur in this system, can be greatly influenced by the phase difference of the lasers involved in the excitation. As a result, the time dependences of the ionization probability, the populations in the bound states and the form of the photoelectron energy spectra can all be controlled by varying the phase difference of the lasers. We also show that for specific atomic and phase parameters population can be entirely trapped within a superposition state, totally immune to decay, with no ionization whatsoever.
We present a joint experimental and theoretical study of selective population of dressed states (SPODS) in a three-level system. Control is exerted by shaped intense femtosecond laser pulses generated by a generalized spectral phase-step modulation function. We show that both control parameters (i.e., the phase-step amplitude and position) can be used to switch population among each three dressed states with high selectivity. The dynamics of the system, and hence the resulting photoelectron signal is studied theoretically by analyzing the time evolution of the adiabatic dressed-state energies and populations.