Ionization of hydrogen atoms by intense vacuum ultraviolet radiation

Bauer, Jarosław H.; Pluciński, Ł.; Piraux, Bernard; Potvliege, R. M.; Gajda, Mariusz; Krzywiński, J.

doi:10.1088/0953-4075/34/11/316

Cited by 25 publications

(20 citation statements)

References 29 publications

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“…Figures 5 and 6 in ref [12] give also photo-electron spectra at incident intensities I 0 = 2.5x10 18 W/cm 2 and I 0 = 2.5x10 19 W/cm 2 , both within the range of the present calculation. There is clear disagreement between the results at I 0 = 2.5x10 19 W/cm 2 , since our calculation (see our figure 4) predicts a 2-photon peak larger than the 1-photon peak, while ref [12] predicts a 1-photon peak larger than the 2-photon peak.…”

Section: Scenario 2 For the Calculationsupporting

confidence: 79%

“…Here we would like to compare our results with those of Bauer Plucinski Piraux Potvliege Gajda and Krzywinski [12]. They also used EDMA, with different pulse profile and intensity range.…”

Section: Scenario 2 For the Calculationmentioning

confidence: 91%

“…It is not so easy to compare these results with ref [12] because it is not clear what the authors mean by "ionization rate [a.u.]" in their figure 3, where the maximum value is ∼0.07 at I 0 = 4x10 17 W/cm 2 , or "total ionization yield" in their figure 4, where a very broad maximum value ∼ 0.95 is found at 2x10 17 W/cm 2 < I 0 < 2x10 18 W/cm 2 .…”

Section: Scenario 2 For the Calculationmentioning

confidence: 98%

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Atomic hydrogen under strong soft X-ray pulses

Castro¹

2008

Braz. J. Phys.

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We discuss theoretically the behavior of atomic Hydrogen under irradiation with strong light pulses in the soft X-ray spectral region. The method consists in the direct numerical solution of the time dependent Schrödinger equation. We find ranges of (high) peak incident intensity I 0 , where 2-photon absorption becomes more probable than 1-photon absorption. At very high intensity, the total ionization probability goes very close to 1 and then decreases as I 0 is further increased.

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Section: Scenario 2 For the Calculationsupporting

confidence: 79%

“…Here we would like to compare our results with those of Bauer Plucinski Piraux Potvliege Gajda and Krzywinski [12]. They also used EDMA, with different pulse profile and intensity range.…”

Section: Scenario 2 For the Calculationmentioning

confidence: 91%

Section: Scenario 2 For the Calculationmentioning

confidence: 98%

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Atomic hydrogen under strong soft X-ray pulses

Castro¹

2008

Braz. J. Phys.

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“…There are indications in the literature [8] that in non-linear optical processes the transition probabilities are strongly dependent on whether the radiation field is turned on adiabatically or suddenly. In order to investigate this issue, we progressively changed from a sharp quasi-rectangular pulse to a smooth envelope of approximate cosine-squared profile, as given by …”

Section: Effect Of the Wings Of The Fel Pulsementioning

confidence: 99%

“…The peak intensity was set to 3.0 10 14 W/cm 2 . We modulated the field, not the intensity, in keeping with ref [8].…”

Section: Effect Of the Wings Of The Fel Pulsementioning

confidence: 99%

Dependence of transition probabilities for non-linear photo-ionization of He atoms on the structure of the exciting radiation pulses

Castro¹,

Möeller²,

Wabnitz³

et al. 2005

Braz. J. Phys.

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We discuss the expected dependence of the probability transitions for 2-photon and 3-photon absorption in Helium gas on the spatial and temporal structure of the exciting radiation pulses. Regarding spatial structure, we assumed a Gaussian radial intensity distribution; we find, as expected, that the 2-photon and 3-photon processes become negligible at distances D away from the focus, where D is of the order of the beam waist FWHM. Regarding temporal structure, we compared transition probabilities for square, Gaussian and cosine squared temporal profiles; we find that for the same FWHM, Gaussian and cosine squared pulses give essentially the same transition probabilities, but the square pulses are about twice as efficient. We finally studied the effect of sharp versus smooth rise and fall edges in the light pulse; we find negligible correlation with the shape of the pulse edges, and strong correlation with the pulse FWHM, i.e., with pulse total energy, as might be expected.

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Gaussian continuum basis functions for calculating high-harmonic generation spectra

Coccia

Mussard

Labeye

et al. 2016

Int. J. Quantum Chem.

104

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We explore the computation of high-harmonic generation spectra by means of Gaussian basis sets in approaches propagating the time-dependent Schrödinger equation. We investigate the efficiency of Gaussian functions specifically designed for the description of the continuum proposed by Kaufmann et al. [J. Phys. B 22, 2223(1989]. We assess the range of applicability of this approach by studying the hydrogen atom, i.e. the simplest atom for which "exact" calculations on a grid can be performed. We notably study the effect of increasing the basis set cardinal number, the number of diffuse basis functions, and the number of Gaussian pseudo-continuum basis functions for various laser parameters. Our results show that the latter significantly improve the description of the low-lying continuum states, and provide a satisfactory agreement with grid calculations for laser wavelengths λ0 = 800 and 1064 nm. The Kaufmann continuum functions therefore appear as a promising way of constructing Gaussian basis sets for studying molecular electron dynamics in strong laser fields using time-dependent quantum-chemistry approaches.

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Ionization of hydrogen atoms by intense vacuum ultraviolet radiation

Cited by 25 publications

References 29 publications

Atomic hydrogen under strong soft X-ray pulses

Atomic hydrogen under strong soft X-ray pulses

Dependence of transition probabilities for non-linear photo-ionization of He atoms on the structure of the exciting radiation pulses

Gaussian continuum basis functions for calculating high-harmonic generation spectra

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