Eight- and nine-photon resonances in multiphoton ionization of xenon

Hansch, P.; Walker, Mark A.; Woerkom, L. D. Van

doi:10.1103/physreva.57.r709

Cited by 33 publications

(19 citation statements)

References 22 publications

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“…4 (bottom) are 130 meV and 80 meV, respectively. The extracted numbers are in good agreement with previously reported values of 120 meV and 74 meV obtained by time-of-flight electron spectroscopy [13]. The main constrains on the photoelectron linewidth are imposed by the rather short lifetimes of dressed states leading to the Freeman resonances, typically 1-60 fs [24].…”

Section: Above-threshold Ionization In Xenonsupporting

confidence: 79%

A new design for imaging of fast energetic electrons

Skruszewicz

Passig

Przystawik

et al. 2014

International Journal of Mass Spectrometry

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a b s t r a c tWe report on an essentially improved version of the classical Eppink-Parker velocity map imaging spectrometer design (Rev. Sci. Instrum. 68, 3477 (1997)). By adding electrostatic lenses with an opposite polarity to the extraction system we succeeded in extending the range of detection of energetic particles up to the keV regime at moderate (<20 kV) extraction voltage conditions. Simulations show that the electrostatic lens system acts in analogy to an achromatic lens in optics and leads to a reduction in the chromatic energy aberration. For comparison to other setups a transmission parameter of the extraction system is defined denoting the maximum kinetic energies of particles which can be analyzed. Detector size and spectrometer length only enter via geometry, that is the straight trajectories in the subsequent field-free particle drift. With respect to Eppink-Parker the energy range has been extended by a factor of 2.5. Moreover, particle trajectory simulations demonstrate that the energy resolution can be improved by about 20%. To test the performance, photoemission studies have been conducted to resolve abovethreshold-ionization patterns from Xe atoms exposed to intense ultrashort laser pulses as well as single photon ionization of Ne atoms using tunable synchrotron radiation with photon energies up to 600 eV.

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Section: Above-threshold Ionization In Xenonsupporting

confidence: 79%

A new design for imaging of fast energetic electrons

Skruszewicz

Passig

Przystawik

et al. 2014

International Journal of Mass Spectrometry

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“…Simultaneous measurements of electron energy and angular distributions enabled by photoelectron imaging techniques [4,5,6,7,8] and a careful quantitative comparison of experimental electronmomentum distributions with theoretical volume-integrated spectra allowed the identification of processes like channel switching, i.e. a change in the number of photons required for resonant population of a Rydberg series upon increase of the laser intensity, as well as multi-photon resonant and non-resonant ionization, and ac Stark splitting [9].…”

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confidence: 99%

Wavelength dependence of photoelectron spectra in above-threshold ionization

Marchenko

Müller

Schafer

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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We present angle-and energy-resolved measurements of photoelectrons produced in strongfield ionization of Xe and Ar using a tunable femtosecond laser in the wavelength range between 600 and 800 nm. Systematic analysis of the experimental data that are quantitatively reproduced by numerical solutions of the time-dependent Schrödinger equation with integration over the laser focal volume, demonstrates the dominance of resonance-enhanced ionization.Continuous variation of the laser wavelength allows the identification of a number of consecutive channel-switching effects with a reliable assignment of the intermediate Rydberg states involved. The appearance of the resonant sub-structure in the electron energy spectra is influenced by the presence of a non-resonant contribution. At relatively low laser intensity a coherent addition of resonant and non-resonant ionization processes is observed. Due to the absence of an intensity dependence in the resonance-enhanced ionization, we observe the persistence of Freeman resonances at the transition to the tunnelling regime.

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“…Traditionally, the resonant ionization signal increases with rising peak intensity due to volumetric growth. 24,25 If the nonresonant population transfer dominates, this should result in the larger enhancement for peak 3, because peak 3 requires lower intensities to be shifted into the resonance than peak 2 and peak 1 do, occurs on the early time of the pulse, and hence more nonresonant time, leading to relatively larger amplitudes of photoelectron peak 3. It is the case in our experiment for intensities below 1.92 × 10 14 W/cm 2 The nonresonant ionization signal increases with peak laser intensities because of the increasing nonresonant time.…”

Section: 2mentioning

confidence: 99%

Femtosecond Photoelectron Imaging of N₂at 410 nm

Guo¹,

Wei²,

Lu³

et al. 2010

Bulletin of the Korean Chemical Society

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We experimentally measure the kinetic energy and angular distributions of photoelectrons of N2 as a function of 410 nm femtosecond laser intensity by using velocity map imaging technique. The strong-field multiphoton ionization of molecules shares many of the characteristics with those of atoms. Electron kinetic energies are nearly independent of laser intensities. The independence suggests that the electron peaks in the photoelectron spectrum actually result from a twostep process, indicative of the occurrence of real population in the intermediate states. The relative amplitudes of electron peaks indicate that in the two-step process, nonresonant population transfer dominates for low intensities, while resonant population transfer dominates for higher intensities.

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Eight- and nine-photon resonances in multiphoton ionization of xenon

Cited by 33 publications

References 22 publications

A new design for imaging of fast energetic electrons

A new design for imaging of fast energetic electrons

Wavelength dependence of photoelectron spectra in above-threshold ionization

Femtosecond Photoelectron Imaging of N₂at 410 nm

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Eight- and nine-photon resonances in multiphoton ionization of xenon

Cited by 33 publications

References 22 publications

A new design for imaging of fast energetic electrons

A new design for imaging of fast energetic electrons

Wavelength dependence of photoelectron spectra in above-threshold ionization

Femtosecond Photoelectron Imaging of N2at 410 nm

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Femtosecond Photoelectron Imaging of N₂at 410 nm