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Hansen, J. C.; Duncanson, John A.; Chien, Ring‐Ling; Berry, R. Stephen

doi:10.1103/physreva.21.222

Cited by 77 publications

(26 citation statements)

References 23 publications

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“…Experiments using polarized excited atoms allow one to determine in addition the ratio of the reduced matrix elements [23][24][25] which is connected with the partial crosssections σ j J0 (ω) via the formula:…”

Section: Transition Amplitude and Cross-sectionmentioning

confidence: 99%

“…4B). The open circle at ε = 0.64 eV is due to Hansen et al [24] who used two pulsed lasers (a dye laser with 4 ns FWHM for 3s−3p 3/2 excitation and a nitrogen laser (337 nm) with 7−10 ns FWHM for ionization) and detected the photoelectrons in an angular-resolved way for several angles η between the electric vectors of the two linearly-polarized lasers. In their data evaluation they took the effects of the coherently excited hyperfine structure on the time evolution of the excited state into account.…”

Section: Photoionization Of Na(3p 3/2 ) Atomsmentioning

confidence: 99%

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Near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na, K, Rb, Cs; n = 3-6)

Petrov

Sukhorukov

Leber

et al. 2000

The European Physical Journal D

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The effect of the polarization of the atomic core by the outer electron on near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na-Cs; n = 3−6) is investigated. Partial and total cross-sections for photo-ionization of the np-electron were computed utilizing the configuration interaction technique with Pauli-Fock atomic orbitals (CIPF) and including the long range core polarization potential (CP). To calculate the core polarization potential the variational principle is applied. Comparison with previous theoretical results and with available experimental data is made for the total cross-section σ, for the electron angular distribution parameter β, for the ratio ν = |D d /Ds| of the reduced electric dipole matrix elements and for the phase shift difference ∆ = δ d − δs, associated with the d-wave and s-wave continua, respectively. In the comparison, new experimental results for σ, ν, and ∆, measured for laser-excited, polarized 39 K(4p 3/2 ) atoms, have been included.PACS. 32.80.Fb Photoionization of atoms and ions -33.60.-q Photoelectron spectra -31.50.+w Excited states

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Section: Transition Amplitude and Cross-sectionmentioning

confidence: 99%

Section: Photoionization Of Na(3p 3/2 ) Atomsmentioning

confidence: 99%

Near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na, K, Rb, Cs; n = 3-6)

Petrov

Sukhorukov

Leber

et al. 2000

The European Physical Journal D

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“…Since determining the phases requires an observable inwhich interferences between partial waves are present, photoelectron angular distributions (PADs) are required for complete measurements. Such experiments have long been performed for atomic systems [1,3] where, for example, PADs obtained via pump-probe schemes utilizing linearly polarized light and a range of pump-probe geometries [4][5][6], or different polarization states [7], have allowed the relative amplitude and phase of two ionization matrix elements to be determined [8]. For molecules, various experimental techniques, including molecular frame PADs [9][10][11], timeresolved rotational wave packet studies [12,13],a n ds t a t eresolved measurements [14][15][16],havebeendemonstrated.The common thread to all of these measurements is the necessity of a data set containing sufficient information to reliably obtain the set of ionization matrix elements (which may be large) via some type of fitting procedure.…”

mentioning

confidence: 99%

Complete Photoionization Experiments via Ultrafast Coherent Control with Polarization Multiplexing

et al. 2014

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth atComplete photoionization experiments via ultrafast coherent control with polarization multiplexing Hockett, P.; Wollenhaupt, M.; Lux, C.; 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=21272941&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272941&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/PhysRevLett.112.223001Physical Review Letters, 112, 22, pp. 1-5, 2014-06- Photoelectron angular distributions (PADs) obtained from ionization of potassium atoms using moderately intense femtosecond IR fields (∼10 12 Wcm −2 ) of various polarization states are shown to provide a route to "complete" photoionization experiments. Ionization occurs by a net three-photon absorption process, driven via the 4s → 4p resonance at the one-photon level. A theoretical treatment incorporating the intrapulse electronic dynamics allows for a full set of ionization matrix elements to be extracted from 2D imaging data. 3D PADs generated from the extracted matrix elements are also compared to experimental, tomographically reconstructed, 3D photoelectron distributions, providing a sensitive test of their validity. Finally, application of the determined matrix elements to ionization via more complex, polarization-shaped, pulses is demonstrated, illustrating the utility of this methodology towards detailed understanding of complex ionization control schemes and suggesting the utility of such "multiplexed" intrapulse processes as powerful tools...

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“…Therefore, finding a superatomic cluster with numbers of unpaired electrons and valence electrons that are similar to those of the corresponding RE is the most important step in mimicking the magnetic properties of REs, which is also the focus of this study. Spectroscopy combined with high-level theoretical calculations has been shown to be a powerful tool to directly examine the electronic structures of atoms and clusters (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28). Herein, we used photoelectron imaging spectroscopy to explore the possibility of mimicking the magnetic properties of the REs.…”

mentioning

confidence: 99%

Mimicking the magnetic properties of rare earth elements using superatoms

Cheng¹,

Berkdemir

Castleman

2015

Proc. Natl. Acad. Sci. U.S.A.

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Rare earth elements (REs) consist of a very important group in the periodic table that is vital to many modern technologies. The mining process, however, is extremely damaging to the environment, making them low yield and very expensive. Therefore, mimicking the properties of REs in a superatom framework is especially valuable but at the same time, technically challenging and requiring advanced concepts about manipulating properties of atom/molecular complexes. Herein, by using photoelectron imaging spectroscopy, we provide original idea and direct experimental evidence that chosen boron-doped clusters could mimic the magnetic characteristics of REs. Specifically, the neutral LaB and NdB clusters are found to have similar unpaired electrons and magnetic moments as their isovalent REs (namely Nd and Eu, respectively), opening up the great possibility in accomplishing rare earth mimicry. Extension of the superatom concept into the rare earth group not only further shows the power and advance of this concept but also, will stimulate more efforts to explore new superatomic clusters to mimic the chemistry of these heavy atoms, which will be of great importance in designing novel building blocks in the application of cluster-assembled nanomaterials. Additionally, based on these experimental findings, a novel “magic boron” counting rule is proposed to estimate the numbers of unpaired electrons in diatomic LnB clusters.

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Angular distributions of photoelectrons from resonant two-photon ionization of sodium through the3p0P322

Cited by 77 publications

References 23 publications

Near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na, K, Rb, Cs; n = 3-6)

Near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na, K, Rb, Cs; n = 3-6)

Complete Photoionization Experiments via Ultrafast Coherent Control with Polarization Multiplexing

Mimicking the magnetic properties of rare earth elements using superatoms

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