Wavelength dependence of photoelectron spectra in above-threshold ionization

Marchenko, T.; Müller, H. G.; Schafer, Kenneth J.; Vrakking, Marc J. J.

doi:10.1088/0953-4075/43/18/185001

Cited by 36 publications

(35 citation statements)

References 25 publications

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“…Examples of such features are abundant. For example, ATI electrons [1], Freeman resonances [2], "fanlike" angular distributions of low-energy photoelectrons [3][4][5], "holography" in the photoelectron momentum distributions [6][7][8], and the conspicuous low-energy structures (LES) of photoelectrons by midinfrared pulses [9][10][11]. In addition, there are fine features observed only in very carefully detailed measurements.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…In the past two decades, strong-field ionization of atomic targets has been studied widely both in theoretical calculations and in experiments [1][2][3][4][5][6][7][8][9]. Most of the experiments have focused on rare-gas atoms whose ionization potential I p = 12-25 eV, with the laser wavelength centered around 800 nm.…”

Section: Introductionmentioning

confidence: 99%

“…For such measurements, it takes about ten or more photons to ionize the atom. In a few cases, experiments have been carried out at shorter wavelengths close to 600 nm [2,3]. Lately, midinfrared lasers have been used in ionization studies and a number of interesting low-energy structures in the electron spectra have been reported [10][11][12].…”

Section: Introductionmentioning

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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“…The photoelectron momentum distribution from this process is often complex but well-defined and has been the subject of many previous studies. 20,21 Conventionally, the 3D momentum distributions of strong field ionization (SFI) were obtained using time-of-flight electron energy spectrometer 20 We first produced circularly polarized light by inserting a quarter wave plate in the 800 nm Ti:Sapphire femtosecond laser beam. The laser intensity was estimated to be around 1 × 10 13 W/cm 2 .…”

Section: A Test Case: Strong Field Ionization Of Xenonmentioning

confidence: 99%

Communication: Time- and space-sliced velocity map electron imaging

Lee

Lin

Lingenfelter

et al. 2014

The Journal of Chemical Physics

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We develop a new method to achieve slice electron imaging using a conventional velocity map imaging apparatus with two additional components: a fast frame complementary metal-oxide semiconductor camera and a high-speed digitizer. The setup was previously shown to be capable of 3D detection and coincidence measurements of ions. Here, we show that when this method is applied to electron imaging, a time slice of 32 ps and a spatial slice of less than 1 mm thick can be achieved. Each slice directly extracts 3D velocity distributions of electrons and provides electron velocity distributions that are impossible or difficult to obtain with a standard 2D imaging electron detector. © 2014 AIP Publishing LLC. [http://dx

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Wavelength dependence of photoelectron spectra in above-threshold ionization

Cited by 36 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

Communication: Time- and space-sliced velocity map electron imaging

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