Multi-quantum processes at high field strengths

Johann, Ulrich; Luk, Ting Shan; McIntyre, I. A.; McPherson, A.; Schwarzenbach, A. P.; Boyer, K.; Rhodes, C. K.

doi:10.1063/1.36008

Cited by 4 publications

(2 citation statements)

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“…have jjeen-seen .to-change sharply with the use of subpicosecond -eadiation as-discussed in other-work appearing in this volume. 18 The intensity thresholds "for ion production exhibit shell effects and" are in good agreement with calculations based on the Keldysh model for neon. The heavier atoms, however, deviate in a consistent manner with increasing atomic number and exhibit, ionization at intensities less than that represented by the Keldysh picture.…”

Section: -supporting

confidence: 67%

Multiphoton ionization in intense ultraviolet laser fields

Johann¹,

Luk²,

McIntyre³

et al. 1986

AIP Conference Proceedings

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The mechanism of collision-free multiphoton ionization of rare gases irradiated with ultraviolet radiation at an intensity of up to -10 16 W/cm 2 at 248 ran and a pulse length of ~ 0.5 ps and -lO 1^ W/cm 2 at 193 nm and -5ps, respectively, has been studied by observing the electron energy spectra and ion charge state threshold intensities. The formation of multiply, charged ions by a sequential process of ionization has been directly detected in the electron energy spectra in the form of a characteristic pattern of interwoven above threshold ionization (ATI) ladder line series. The threshold intensities for ion production have been compared with the Keldysh model and were found to be in good agreement for light ions (Ne) and consistently lower for heavier ions (Xe), scaling with the atonic number. These measurements, together with estimates of the ion population dynamics during the rise of the laser pulse can be reasonably understood on the basis of a single electron picture.

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Section: -supporting

confidence: 67%

Multiphoton ionization in intense ultraviolet laser fields

Johann¹,

Luk²,

McIntyre³

et al. 1986

AIP Conference Proceedings

Self Cite

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show abstract

“…In order to study the conditions necessary for new atcmic responses to occur and to determine the influence of possible damping mechanisms, the properties of ion charge state distributions, 5 electron energy spectra, 6 and harmonic radiation 7 produced by irradiation of atoms with ultraviolet radiation with different pulse lengths, wavelengths, and intensities have been investigated. 8 have begun to explore the atomic response to intense 248 nm irradiation (_ 1016 W/cm 2 ) with subpicosecond pulses.…”

Section: ) Field-induced Interferencesmentioning

confidence: 99%