Laser-peak-intensity calibration using recoil-ion momentum imaging

Alnaser, A. S.; Tong, Xiao-Min; Osipov, T.; Voss, S.; Maharjan, C.; Shan, Bing; Chang, Zenghu; Cocke, C. L.

doi:10.1103/physreva.70.023413

Cited by 152 publications

(132 citation statements)

References 27 publications

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“…Calibration of the peak intensity on target was done with an estimated precision of ±10% by separate measurements using single ionization of Ar atoms in circularly polarized light [52].…”

Section: Methodsmentioning

confidence: 99%

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

et al. 2014

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We experimentally investigate the ionization mechanism behind the formation of remarkably high charge states observed in the laser-pulse-induced fragmentation of different hydrocarbon molecules by Roither et al. [Phys. Rev. Lett. 106, 163001 (2011)], who suggested enhanced ionization occurring at multiple C-H bonds as the underlying ionization mechanism. Using multiparticle coincidence momentum imaging we measure the yield of multiply charged fragmenting ethylene and acetylene molecules at several intensities and pulse durations ranging from the few-cycle regime to 25 fs. We observe, at constant intensity, a strong increase of the proton energy with increasing laser pulse duration. It is shown that this is caused by a strong increase in the yield of highly charged parent molecular ions with pulse duration. Based on experimental evidence we explain this increase by the necessary population of precursor states in the parent ion that feature fast C-H stretch dynamics to the critical internuclear distance, where efficient ionization via enhanced ionization takes place. For increasing pulse duration these precursor ionic states are more efficiently populated, which leads in turn to a higher enhanced-ionization probability for longer pulses. Our work provides experimental evidence for the existence of a multiple-bond version of enhanced ionization in polyatomic molecules.

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“…Calibration of the peak intensity on target was done with an estimated precision of ±10% by separate measurements using single ionization of Ar atoms in circularly polarized light [52].…”

Section: Methodsmentioning

confidence: 99%

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

et al. 2014

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“…Multiplying this tunneling filter with the ground-state momentum distribution thus leads to a simple product formula for the lateral distribution [22]. This has been exploited to improve [23] the measurement of laser peak intensities via momentum distributions [24]. The measured widths from circularly polarized fields [20] are about 15% above the values predicted by the product formula, suggesting that nonadiabatic corrections [25] might cause such a deviation.…”

mentioning

confidence: 98%

Adiabaticity in the lateral electron-momentum distribution after strong-field ionization

Henkel

Lein

Engel³

et al. 2012

Phys. Rev. A

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By solving the time-dependent Schrödinger equation for atoms in short laser pulses of different polarizations, it is shown that in strong-field ionization without rescattering, the lateral width of the electron-momentum distribution corresponds adiabatically to the instantaneous laser field on a sub-laser-cycle time scale, as expected in pure tunneling ionization. In contrast to the distributions along the polarization direction, the width is affected little by depletion or Coulomb effects. Over the past three decades, rapid progress has been made in the development of lasers capable of producing strong pulses in the femtosecond regime. This had led to progress in many areas ranging from above-threshold ionization (ATI) [1] over highorder harmonic generation [2] and attosecond pulse generation [3] to laser-induced fragmentation of molecules [4,5], to name just a few. Many of the phenomena induced by strong fields have been explained on the basis of tunneling ionization. Tunneling is a purely quantum mechanical process, which is considered as one of the main differences from classical mechanics. Frequently, a semiclassical two-step model is invoked, which assumes that ionization leads to the birth of an unbound electron at the outer exit of the laser-induced tunneling barrier. After appearing in the classically allowed region, the electron motion is modeled by a Newtonian trajectory [6]. This has been used for many purposes, e.g., to derive cutoff laws in ATI [7,8], to describe Coulomb focusing [9], to correct the strong-field approximation for elliptically polarized fields [10], and to model the momentum distribution in angular streaking [11]. The semiclassical model is also the basis for the three-step model of high-order harmonic generation [12].For an understanding of strong-field processes it is essential to verify the validity of the tunneling and semiclassical pictures. Along these lines, attosecond angular streaking [13][14][15], originally proposed to measure the carrier-envelope phase of few-cycle pulses [16], has been utilized to put a small upper limit on the tunneling delay time between the maximum of the electric field and the appearance of the escaping electron [17], thus giving insight into strong-field ionization on extremely short time scales. The interpretation of the momentum spectra in angular streaking, however, is complicated by Coulomb effects on the electron trajectories after tunneling and furthermore it is restricted to the intensity range below saturation [11]. It is desirable to overcome these limitations of angular streaking.Recently, the importance of the lateral momentum distribution, i.e., the distribution in the direction perpendicular to the laser field, has been recognized [18][19][20]. If not modified by electron recollision, the lateral distribution carries direct information about the ionization step since there is no laserinduced force in this direction. The tunneling ionization rate decreases with increasing lateral momentum approximately as a Gaussian. The width of the Ga...

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“…Ti:sapphire laser pulses (40 fs, 800 nm, 5 J, 100 kHz repetition rate) are focused to peak intensity of 4:5 0:5 10 14 W=cm 2 into a supersonic 4 He gas jet. The peak intensity in the laser pulse was determined by calibrating the pulse energy-to-intensity relation using the radial ion and electron momentum in a separate experiment in circularly polarized laser pulses [21]. The result was verified by fitting the predictions of tunnel theory [22]t o the He momentum distribution parallel to the laser field.…”

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confidence: 99%

Binary and Recoil Collisions in Strong Field Double Ionization of Helium

et al. 2007

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Binary and recoil collisions in strong field double ionization of helium Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevLett.99.263002Physical Review Letters, 99, 26, 2007 We have investigated the correlated momentum distribution of both electrons from nonsequential double ionization of helium in a 800 nm, 4:5 10 14 W=cm 2 laser field. Using very high resolution coincidence techniques, we find a so-far unobserved fingerlike structure in the correlated electron momentum distribution. The structure can be interpreted as a signature of the microscopic dynamics in the recollision process. We identify features corresponding to the binary and recoil lobe in field-free (e; 2e) collisions. This interpretation is supported by analyzing ab initio solutions of a fully correlated three-dimensional helium model. Binary and Recoil Collisions in Strong Field Double Ionization of Helium

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Laser-peak-intensity calibration using recoil-ion momentum imaging

Cited by 152 publications

References 27 publications

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Adiabaticity in the lateral electron-momentum distribution after strong-field ionization

Binary and Recoil Collisions in Strong Field Double Ionization of Helium

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