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Circularly Polarized Laser Fields, with Different Z, Including Non-Zero Initial Momentum

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Ristić V., Miladinović T., Stevanović J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6
761-763
EN
In this paper, by estimating the influence of different atom charge Z to the transition rate in tunnel ionization of atoms in strong laser fields we are devoloping further the observations from our earlier work. That is in the process of tunnel ionization including non-zero momentum into calculation of the transition rate gives result in lower transition rates for ejecting electrons from atoms by low-frequency laser fields, indicating that much of the photons are engaged in transferring energy to the free electron and thus unable to contribute to the effect of ionization. This is a conclusion that needs further experimental testing, which would clarify the mechanisms of tunnel ionization.
2
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Influence of Ponderomotive Potential and NonZero Initial Momentum of Ejected Electron on Transition Rate in Multiphoton Ionization

100%
Miladinović T., Petrović V., Ristić V.
Acta Physica Polonica A
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2013
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vol. 124
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issue 4
658-660
EN
The multiphoton ionization of neutral atoms irradiated by photons is an interesting topic for experimental and also theoretical examination. We study the influence of ponderomotive potential and non-zero initial momentum of ejected electrons on transition rate, and also on the generalized cross-section in the case of a multiphoton ionization process. Also, we study how the transition rate depends on the number of absorbed photons.
3
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Transition Rate Dependence on the Non-Zero Initial Momentum in the ADK-Theory

100%
Ristić V., Miladinović T., Radulović M.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
909-914
EN
Tunneling regime, introduced by Keldysh, in the interaction of strong lasers with atoms has been now accepted as the reliable method for describing processes when low frequency lasers are involved. Yet it was always assumed that the ionized electrons are leaving the atom with zero initial momentum. Because we are interested in how non-zero momentum influences the transition probability of tunnel ionization, we obtained the exact expression for the momentum. Here the estimation of the transition probability with nonzero momentum included was conducted. Potassium atoms in the laser field whose intensity varied from 10^{13} W/cm^2 to 10^{14} W/cm^2 were studied. It seems that all energy of laser field is used for tunneling ionization process at the beginning of laser pulse - ionization probability is large. After that, with further action of laser pulse, ionization probability decreases, probably because part of laser pulse energy is used for increasing momentum of ejected electrons, leaving smaller amounts of light quanta available for ionization of remaining electrons. If laser pulse lasts long enough, then the amounts of light quanta available for ionization become larger, resulting in increase in ionization probability, now with greater starting energy of ejected electrons.
4
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Calculating Ionization Transition Rate for Circularly Polarized Fields, Including Non-Zero Initial Momentum

100%
Ristić V., Miladinović T., Radulović M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
504-506
EN
Potassium atoms in circularly polarized laser field whose intensity (I) varies from 2× 10^{12} W/cm^2 to 2.5× 10^{14} W/cm^2 were studied. In the case when there is zero initial momentum, transition rate (that depends only on I) exhibits standard behaviour: as I increases, so thus the rate, until it reaches its maximum value at 1.1× 10^{14} W/cm^2; after that, rate diminishes as I increases. In the case of non-zero initial momentum, transition rate (that now depends on I but additionally on initial momentum, too) exhibits following behaviour: dependence of the rate on I follows standard pattern, it rises with increase of I until it reaches its maximum, and then diminishes. But with increase of momentum, ionization rate gradually diminishes.
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