Influence of the dynamic Stark effect on photoelectron angular distributions in multiphoton ionization

Ohnesorge, W.F.; Diedrich, F.; Leuchs, Gerd; Elliott, Daniel S.; Walther, H.

doi:10.1103/physreva.29.1181

Cited by 23 publications

(5 citation statements)

References 20 publications

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“…For example, for the case where the angular acceptance of the experimental set up is limited. Moreover, differential polarization rates and photoelectron angular distributions provide useful information on bound-free matrix elements and relative phase shifts for atomic systems [19][20][21][22][23][24][25][26][27][28][29]. In the following, we will therefore calculate the differential polarization rate and show that it can be significantly different when the detection angle is varied.…”

Section: Table 1 Expression Of the Dipole Moment Coefficients For The...mentioning

confidence: 99%

Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates

Bouchène¹,

Zamith

Girard³

2001

J. Phys. B: At. Mol. Opt. Phys.

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This paper presents a theoretical analysis of the possibilities of producing spin-polarized electrons with a sequence of two ultra-short time-delayed laser pulses. The first pulse, which is right circularly polarized, excites resonantly the fine structure np level of potassium atoms leading to a spin-flip and thus polarizing the atom. The second pulse ionizes the system thereby resulting in spin-polarized electron release. We examine and compare several situations corresponding to different polarizations of the ionizing pulse (σ + , σ − and π ).For each case we derive analytical expressions for the angular and global electron spin-polarization rates as well as for the differential cross sections. The obtained rates can be very high (up to 100%) and can be controlled accurately on the femtosecond time scale by varying the time delay between the pulses.

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Section: Table 1 Expression Of the Dipole Moment Coefficients For The...mentioning

confidence: 99%

Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates

Bouchène¹,

Zamith

Girard³

2001

J. Phys. B: At. Mol. Opt. Phys.

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“…A similar effect has also been considered in energy-domain work probing intensity effects, for instance refs. [48] and [49], which investigated the high-intensity nano-second pulse regime where AC Stark shifted levels may be tuned in and out of resonance with the excitation pulse, yielding a strong intensity dependence in the angular interferograms according to the number and nature of the states which were coupled by the multi-photon ionization scheme at a given intensity. Due to the the additional laser bandwidth present in the femto or atto-second regime, and consequent broad photoelectron bands, this type of effect might be expected to be very general, and has indeed recently been explored in theory for atto-second ionization in strong fields [50].…”

Section: Discussionmentioning

confidence: 99%

Maximum-information photoelectron metrology

et al. 2015

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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 Maximum-information photoelectron metrology Hockett, P.; Lux, C.; Wollenhaupt, M.; Baumert, T.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21276916&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21276916&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en 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. 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/PhysRevA.92.013412Physical Review A: Atomic, Molecular, and Optical Physics, 92, 1, 2015-07-13 Photoelectron interferograms, manifested in photoelectron angular distributions (PADs), are high-information, coherent observables. In order to obtain the maximum information from angle-resolved photoionization experiments it is desirable to record the full, three-dimensional (3D), photoelectron momentum distribution. Here we apply tomographic reconstruction techniques to obtain such 3D distributions from multiphoton ionization of potassium atoms, and fully analyze the energy and angular content of the 3D data. The PADs obtained as a function of energy indicate good agreement with previous 2D data and detailed analysis [Hockett et al., Phys. Rev. Lett. 112, 223001 (2014)] concerning the main spectral features, but also indicate unexpected symmetry breaking in certain regions of momentum space, thus revealing additional continuum interferences which cannot otherwise be observed. These observations reflect the presence of additional ionization pathways and, most generally, illustrate the power of maximum-information measurements of coherent observables for quantum metrology of c...

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“…shift [16] and altered probabilities of different electron ionization pathways with changes of the laser intensity. Since zero order ATI requires four photons, the fitting using equation ( 2) with n = 8 was performed.…”

Section: Dependence On Intensitymentioning

confidence: 99%

“…Measuring the photoelectron angular distributions (PADs) gives additional information about the atomic transitions [15]. The angular distributions of electrons can vary depending on the initial, intermediate, and final continuum energy states involved in the process [16]. Therefore, measurements of PADs have been used frequently for investigation of atomic structures as well as fundamental features of laser-matter interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Hart et al also studied ATI of the sodium atom and demonstrated that the electron yield can be enhanced or suppressed by choosing a suitable laser wavelength and intensity [25]. Although a number of studies using different techniques have been performed on the strong field ionization of sodium with particular emphasis on the photoionization cross-sections [26][27][28][29], dependence of PADs on intensity for nanosecond laser pulses [16,30] and selectively controlled ionization [25], PADs of resolved ATI peaks for sodium atoms with ionization by femtosecond laser pulses have not been studied. The distinctive characteristic of ATI peaks obtained with femtosecond pulses is that the substructures in the ATI peaks become clearly visible [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Energy and angular distributions of electrons from sodium atoms photo-ionized with femtosecond laser pulses

Boran¹,

Hart²,

Kaya³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We studied photoelectron angular distributions (PADs) and energy spectra of sodium atoms photo-ionized with intense short laser pulses in the near-infrared region. Energy spectra of photoelectrons due to multistep ionization of sodium atoms through intermediate levels 5p, 6p, 7p, and 4f were observed in above threshold ionization (ATI) at laser intensities of 2 × 10 13 W cm −2 and 1 × 10 13 W cm −2 . The PADs from the 5p(4f ) state for zero, first, second and third order ATI peaks were measured. We observed that for the two selected laser intensities the angular distribution of photoelectrons showed only slight variations. The PADs exhibit main lobes within ∼60 • degrees from the laser polarization and additional lobes that become more pronounced with the increasing ATI peak number. Besides a general analytical representation of the observed angular dependences, the experimental PADs for each ATI peak were fitted with Legendre polynomials accounting for different ionization channels. The good agreement between the experimental data and fitting functions allowed to evaluate the contributions of the ionization channels to the observed ATI orders. The calculations of the photoelectron spectra by numerically solving the time-dependent Schrödinger equation in a single active electron approximation produced agreement with the experiment in the main features of the spectra, while differences in more subtle details were observed.

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Influence of the dynamic Stark effect on photoelectron angular distributions in multiphoton ionization

Cited by 23 publications

References 20 publications

Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates

Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates

Maximum-information photoelectron metrology

Energy and angular distributions of electrons from sodium atoms photo-ionized with femtosecond laser pulses

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