Acceleration of neutral atoms in strong short-pulse laser fields

Eichmann, U.; Nubbemeyer, Thomas; Rottke, H.; Sandner, W.

doi:10.1038/nature08481

Cited by 234 publications

(164 citation statements)

References 25 publications

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“…This wave packet is highly polarizable and would possess a large dipole moment. Such a highly polarizable Rydberg atom can then experience a very large force in a spatially nonuniform laser field, as reported in an earlier experiment [26].…”

Section: Distributions Of Excited Statessupporting

confidence: 56%

Fine structures in the intensity dependence of excitation and ionization probabilities of hydrogen atoms in intense 800-nm laser pulses

Tong

Morishita

et al. 2014

Phys. Rev. A

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We studied the elementary processes of excitation and ionization of atomic hydrogen in an intense 800-nm pulse with intensity in the 1.0 to 2.5 × 10 14 W/cm 2 range. By analyzing excitation as a continuation of above-threshold ionization (ATI) into the below-threshold negative energy region, we show that modulation of excitation probability and the well-known shift of low-energy ATI peaks vs laser intensity share the same origin. Modulation of excitation probability is a general strong field phenomenon and is shown to be a consequence of channel closing in multiphoton ionization processes. Furthermore, the excited states populated in general have large orbital angular momentum and they are stable against ionization by the intense 800-nm laser-they are the underlying reason for population trapping of atoms and molecules in intense laser fields.

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Section: Distributions Of Excited Statessupporting

confidence: 56%

Fine structures in the intensity dependence of excitation and ionization probabilities of hydrogen atoms in intense 800-nm laser pulses

Tong

Morishita

et al. 2014

Phys. Rev. A

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“…These high Rydberg atoms have large induced dipole polarizability. In the presence of an intense laser field, they would experience unprecedented acceleration [28]. The population of Rydberg states will be further analyzed in Sec.…”

Section: B Multiphoton Ionization Of Li-total Ionization Probabilitiesmentioning

confidence: 99%

Photoelectron spectra and high Rydberg states of lithium generated by intense lasers in the over-the-barrier ionization regime

Morishita

Lin

2013

Phys. Rev. A

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We calculated photoelectron energy and momentum spectra and the population of high Rydberg states of lithium atoms by intense 785 nm laser pulses at intensities in the over-the-barrier ionization (OBI) regime. The calculated spectra are compared to experiments reported in Schuricke et al. [Phys. Rev. A 83, 023413 (2011)]. It is shown that in the OBI regime, due to strong depletion of the ground state, the photoelectron spectra are generated from the leading edge of the laser pulse only, resulting in spectra that are nearly independent of laser intensities. Analysis of the calculated spectra reveals that total ionization probability is suppressed as the intensity is increased in the OBI regime. The suppression is due to the increase of excitation probability of high Rydberg states in the OBI regime, demonstrating that atoms and molecules are never fully ionized at high intensities. We also conclude that the interference stabilization model is not needed to explain the formation of high Rydberg states, and that there is no evidence that laser-dressed Kramers-Henneberger states play a role in the strong-field ionization of atoms and molecules by infrared lasers in the OBI regime.

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“…In general, the emergence of strong, symmetry forbidden, lines in high harmonic spectra is a tell-tale sign of symmetry breaking induced by the underlying attosecond electronic [54,55] or vibronic dynamics [56][57][58]. Specifically, we show that symmetry forbidden lines in high harmonic spectra generated in bi-circular fields are sensitive to frustrated tunnel ionization [59][60][61][62][63][64] and the presence of strongly laser-driven Rydberg states, the so-called 'bound states of the free electron' [65], which are able to survive intense laser fields [60][61][62][63][64][66][67][68][69] even when the ground state of the neutral is completely depleted [61,70].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields: the role of Rydberg states

et al. 2017

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Abstract:The bi-circular scheme for high harmonic generation, which combines two counterrotating circular fields with frequency ratio 2:1, has recently permitted to generate high harmonics with essentially circular polarization, opening the way for ultrafast chiral studies. This scheme produces harmonic lines at 3N + 1 and 3N + 2 multiples of the fundamental driving frequency, while the 3N lines are forbidden owing to the three-fold symmetry of the field. It is generally established that the routinely observed signals at these forbidden harmonic lines come from a slight ellipticity in the driving fields, which breaks the three-fold symmetry. We find that this is neither the only nor it is the dominant mechanism responsible. The forbidden lines can be observed even for perfectly circular, long driving pulses. We show that they encode rich information on the sub-cycle electronic dynamics that occur during the generation process. By varying the time delay and relative intensity between the two drivers, we demonstrate that when the second harmonic either precedes or is more intense than the fundamental field, the dynamical symmetry of the system is broken by electrons trapped in Rydberg orbits (i.e., Freeman resonances), and that the forbidden harmonic lines are a witness of this.

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Acceleration of neutral atoms in strong short-pulse laser fields

Cited by 234 publications

References 25 publications

Fine structures in the intensity dependence of excitation and ionization probabilities of hydrogen atoms in intense 800-nm laser pulses

Fine structures in the intensity dependence of excitation and ionization probabilities of hydrogen atoms in intense 800-nm laser pulses

Photoelectron spectra and high Rydberg states of lithium generated by intense lasers in the over-the-barrier ionization regime

Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields: the role of Rydberg states

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