Strong-field ionization of lithium

Schuricke, Michael; Zhu, G.; Steinmann, J.; Simeonidis, Konstantinos; Ivanov, Igor; Kheifets, Anatoli; Grum–Grzhimailo, A. N.; Bartschat, Klaus; Dorn, Alexander; Ullrich, J.

doi:10.1103/physreva.83.023413

Cited by 69 publications

(84 citation statements)

References 37 publications

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“…COLTRIMS were primarily developed for the study of few-body dynamics induced by particle impact, i.e. electrons and ions, but the extension to scrutinize and tackle laser-induced processes was natural (see e.g [8][9][10]). Among the features which were theoretically analyzed was the complex emission pattern present in the two-dimensional momentum plane, parallel and perpendicular to the laser polarization axis, of the laser-ionized electron distributions near threshold [11].…”

Section: Introductionmentioning

confidence: 99%

Electron-momentum distributions and photoelectron spectra of atoms driven by an intense spatially inhomogeneous field

et al. 2013

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We use three dimensional time-dependent Schrödinger equation (3D-TDSE) to calculate angular electron momentum distributions and photoelectron spectra of atoms driven by spatially inhomogeneous fields. An example for such inhomogeneous fields is the locally enhanced field induced by resonant plasmons, appearing at surfaces of metallic nanoparticles, nanotips and gold bow-tie shape nanostructures. Our studies show that the inhomogeneity of the laser electric field plays an important role in the above threshold ionization process in the tunneling regime, causing significant modifications to the electron momentum distributions and photoelectron spectra, while its effects in the multiphoton regime appear to be negligible. Indeed, through tunneling ATI process, one can obtain higher energy electrons as well as high degree of asymmetry in the momentum space map. In this study we consider near infrared laser fields with intensities in the mid-10 14 W/cm 2 range and we use linear approximation to describe their spatial dependence. We show that in this case it is possible to drive electrons with energies in the near-keV regime. Furthermore, we study how the carrier envelope phase influences the emission of ATI photoelectrons for few-cycle pulses. Our quantum mechanical calculations are fully supported by their classical counterparts.

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Section: Introductionmentioning

confidence: 99%

Electron-momentum distributions and photoelectron spectra of atoms driven by an intense spatially inhomogeneous field

et al. 2013

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“…The experiment is from Schuricke et al [4]. Note that the photoelectron spectrum is dominated by the four-photon absorption peak, with a minor contribution from the five-photon absorption peak, for intensities from 4-70 TW/cm 2 .…”

Section: Fig 4 (Color Online)mentioning

confidence: 99%

“…This latter condition is satisfied for rare-gas atoms, but not for atoms such as Li when they are exposed to ∼800 nm laser pulses. In a recent experiment by Schuricke et al [4], photoelectron spectra of Li atoms by 785 nm, 30 fs pulses with intensities between 10 11 and 10 14 W/cm 2 were reported. Due to the small I p = 5.39 eV, absorption of only four photons will be able to ionize a Li atom.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Most remarkably, we find that the KH-atom is formed and can be detected even before the onset of stabilization. Our analysis is done for an alkaline atom (potassium), where the required parameters are similar to those in recent experiments (20,21).…”

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confidence: 99%

Imaging the Kramers–Henneberger atom

Morales

Richter

Patchkovskii

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Today laser pulses with electric fields comparable to or higher than the electrostatic forces binding valence electrons in atoms and molecules have become a routine tool with applications in laser acceleration of electrons and ions, generation of short wavelength emission from plasmas and clusters, laser fusion, etc. Intense fields are also naturally created during laser filamentation in the air or due to local field enhancements in the vicinity of metal nanoparticles. One would expect that very intense fields would always lead to fast ionization of atoms or molecules. However, recently observed acceleration of neutral atoms [Eichmann et al. (2009) Nature 461:1261-1264 at the rate of 10 15 m∕s 2 when exposed to very intense IR laser pulses demonstrated that substantial fraction of atoms remained stable during the pulse. Here we show that the electronic structure of these stable "laser-dressed" atoms can be directly imaged by photoelectron spectroscopy. Our findings open the way to visualizing and controlling bound electron dynamics in strong laser fields and reexamining its role in various strong-field processes, including microscopic description of high order Kerr nonlinearities and their role in laser filamentation [Béjot et al. (2010) Phys Rev Lett 104:103903].dressed atom | atomic stabilization | strong-field ionization | Kramers-Henneberger approximation

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Strong-field ionization of lithium

Cited by 69 publications

References 37 publications

Electron-momentum distributions and photoelectron spectra of atoms driven by an intense spatially inhomogeneous field

Electron-momentum distributions and photoelectron spectra of atoms driven by an intense spatially inhomogeneous field

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

Imaging the Kramers–Henneberger atom

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