Influence of Coulomb continuum wave functions in the description of high-order harmonic generation with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math>

Ciappina, M. F.; Chirilă, C. C.; Lein, Manfred

doi:10.1103/physreva.75.043405

Cited by 65 publications

(59 citation statements)

References 31 publications

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“…The SFA is also predicted to influence the amplitude of the phase jump. A recent simulation of the HHG in H + 2 approximates the effect of the molecular potential by representing the ionized electron as a two-center coulomb continuum wavefunction [19]. The results of the simulation predict a phase jump of 0.6π compared to the π phase jump predicted when modeling the electron as a plane wave.…”

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confidence: 69%

“…For Ar it is known that a plane wave treatment results in a correct harmonic phase jump magnitude, however at the wrong spectral position [18]. The inclusion of the Coulomb potential for H + 2 has resulted in a reduced harmonic phase jump in comparison to the predicted π phase jump of a plane wave model [19]. The first realization of tomography in N 2 assumed a phase change of π and modelled the recombining electron as a plane wave in the orbital reconstruction [6].…”

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confidence: 99%

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High-order harmonic phase in molecular nitrogen

et al. 2009

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Electronic structure in atoms and molecules modulates the amplitude and phase of high harmonic generation (HHG). We report measurements of the high harmonic spectral amplitude and phase in N 2 . The phase is measured interferometrically by beating the N 2 harmonics with those of an Ar reference oscillator in a gas mixture. A rapid phase shift of 0.2π is observed in the vicinity of the HHG spectral minimum, where a shift of π had been presumed [J. Itatani et al., Nature 432, 867 (2004)]. We compare the phase measurements to a simulation of the HHG recombination step in N 2 that is based on a simple interference model. The results of the simulation suggest that modifications beyond the simple interference model are needed to explain HHG spectra in molecules.

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confidence: 69%

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confidence: 99%

High-order harmonic phase in molecular nitrogen

et al. 2009

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“…However, in experiments a smaller and smoother phase jump is observed [20]. Such deviations can be attributed to nonclassical momenta [21] and to effects of the Coulombic potential [22]. Similarly, a phase jump is observable when one considers a fixed harmonic as a function of θ .…”

Section: Harmonic Phasementioning

confidence: 94%

“…x cos( 1 2 kR cos θ ) [22,25]. Then the variation φ of the polarization direction on varying θ in the vicinity of θ p is proportional to (kR cos θ ) (π/ cos θ p ) (cos θ ).…”

Section: A Polarization Directionmentioning

confidence: 99%

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Two-center interference and ellipticity in high-order harmonic generation fromH2+

Zwan

Lein

2010

Phys. Rev. A

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We present a theoretical investigation into the two-center interference in aligned H + 2 . The influence of the laser field on the recombination step is investigated by comparing laser-induced harmonic generation with harmonic generation from field-free collisions of Gaussian wave packets with the core. We find that for different Gaussian wave packets colliding with the molecule, the interference minimum occurs at the same alignment angle. The same result is obtained for the laser-induced spectrum when only a single electronic trajectory per harmonic contributes. When multiple electronic trajectories contribute, we find an effect on the minimum position because the interference between short and long trajectories is alignment dependent. The two-center interference and the influence of the Coulombic potential are clearly seen not only in the harmonic intensity and phase but also in the polarization direction and ellipticity. We observe significant ellipticity of the emitted radiation around the two-center interference minimum.

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