Above-threshold ionisation without space charge

Yergeau, F.; Petite, G.; Agostini, Pierre

doi:10.1088/0022-3700/19/19/005

Cited by 73 publications

(15 citation statements)

References 19 publications

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“…In [59] R 6+S /R 6 Our model R 6+S /R 6 6+S 10TW/cm 2 15TW/cm 2 5TW/cm 2 9TW/cm 2 suppression effect occurs at the laser intensity of around 15TW/cm 2 . According to our calculation for hydrogen atom (see column four and five in Table 4), the ATI peak suppression effect in domain of multiphoton ionization can also be explained.…”

Section: Resultsmentioning

confidence: 82%

“…Here, 6 represents the minimal number of photons for hydrogen atom ionization. In the perturbative calculation [59] (see column two and three in Table 4), the rate of (6+0) ATI-0 becomes smaller than that of (6+1) ATI-1 when the laser intensity is around 15TW/cm 2 . This means the ATI peak Table 4: (6+S)-photon ionization of hydrogen atom in a circularly polarized laser field with a wavelength of 532nm, normalized to that of the S = 0 peak.…”

Section: Resultsmentioning

confidence: 96%

“…In addition, photoionization peak suppression is one of the interesting features of the Above-threshold ionization (ATI) in the domain of multiphoton ionization of atoms. The perturbative calculation for atomic hydrogen [58,59] is used as an analogy to explain the ATI peak suppression effect of Xenon in circularly polarized laser field [57,59]. Table 4 shows relative ATI rate of atomic hydrogen in an intense circularly polarized laser field with a wavelength of 532nm from the calculation by perturbation theory model and our nonperturbative theory model.…”

Section: Resultsmentioning

confidence: 99%

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Computational Investigation of the Interaction Between Hydrogen Atoms and an Intense Circularly Polarized Laser Field

Yang

Wang

Zhang

et al. 2012

Commun. comput. phys.

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The study of interactions between a high-power laser and atoms has been one of the fundamental and interesting topics in strong field physics for decades. Based on a nonperturbative model, ten years ago, we developed a set of programs to facilitate the study of interactions between a circularly polarized laser and atomic hydrogen. These programs included only contribution from the bound states of the hydrogen atom. However, as the laser intensity increases, contribution from continuum states to the excitation and ionization processes becomes larger and can no longer be neglected. Furthermore, because the original code is not able to add this contribution directly due to its many disadvantages, a major upgrade of the code is required before including the contribution from continuum states in future. In this paper, first we deduce some important formulas for contribution of continuum states and present modifications and tests for the upgraded code in detail. Second we show some comparisons among new results, old results from the original codes and the available experimental data. Overall the new result agrees with experimental data well. Last we present our calculation of above-threshold ionization (ATI) rate and compare it with a pertuba-tive calculation. The comparison shows that our nonperturbative calculation can also produce ATI peak suppression.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Computational Investigation of the Interaction Between Hydrogen Atoms and an Intense Circularly Polarized Laser Field

Yang

Wang

Zhang

et al. 2012

Commun. comput. phys.

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“…The advent of high resolution electron spectrometers, some with solid angles of collection approaching lit sr (Kruit and Read 1983), allowed the high irradiance region to be reexamined (Kruit et al 1983, Yergeau, Petite, andAgostini 1986), and there were further surprises. Not only did large numbers of peaks appear, but many of the low energy peaks vanished -as many as 2000 in experiments using CO2 lasers, judging from the absence of electron energies below about 100 eV from xenon at 10 13 W/cm 2 (Xiong, Yergeau, and Chin 1988).…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Measurement of intensity-dependent rates of above-threshold ionization (ATI) of atomic hydrogen at 248 nm

Nichols¹

1991

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saved me countless hours in the lab and taught me many valuable si Us such as how to keep an ultrahigh vacuum system clean and how to choose a capacitor for a short-pulse circuit. In this dissertation, I have tried to distinguish between things I can claim credit for individually ("I measured ...") and group efforts ("We measured ..."). I depended on Group CLS-5, especially Dr. Toni Taylor, Sue Harper, and Jeff Roberts, to maintain and operate the LABS-I laser. They also provided the measurement of the pulse length. They went out of their way several times to help me when I needed a little extra laser time at the end of the day. Space does not permit listing all the others at LANL who helped in particular situations, discussed my work and theirs, or kept the paperwork flowing so that I could work in the lab, but they are a big part of the reason that Los Alamos is a good place to work. At UNM, Dr. Wilhelm Becker took the time on many occasions to help me understand the theory of ATI and to describe it accurately in my dissertation. I also thank Dr. Thomas Niemczyk of the Chemistry Department for serving on my committee. Finally, I thank Dr. Shih-I Chu for allowing me to use his theoretical results prior to publication, and Dr. George Csanak for correcting the misprint in the paper by Keldysh. IBM and PC-AT are registered trademarks of International Business Machines Corporation. Microsoft is a registered trademark of Microsoft Corporation. Pyrex is a registered trademark of Corning Glass Works.

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“…When additional photons are absorbed the perturbed wave function extends to larger radii, and the (higherenergy) continuum wave function can penetrate deeper into the core, improving the spatial overlap. The ATI spectrum is now determined by the competition between the improving spatial overlap as more photons are absorbed and the decreasing probability of higher-order ATI due to the weakness of the perturbation [1,23]. The result of this competition is highly dependent on the allowed angular momentum of the final state and on the energy of the outgoing electron.…”

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confidence: 99%