The asymmetry of the angular distributions of photoelectrons in the photoionisation of polarised alkali atoms is investigated. The general formulas for the amplitude of the multiphoton ionisation of ...np-states are given. In these formulas the dynamical and kinematical factors are explicitly separated. Our calculations within Fues model potential approach demonstrate that, under the experimental conditions essentially similar to those employed in M. Schuricke, Ganjun Zhu, J. Steinmann, K. Simeonidis, I. Ivanov, A. Kheifets, A.N. Grum-Grzhimailo, K. Bartschat, A. Dorn, J. Ullrich, Phys. Rev. A 83 (2011) 023413(11), the relative magnitude of the linear magnetic dichroism in three-photon ionisation of Li can be as large as 30%.
•The general expression for an amplitude of multiphoton ionisation of a polarised atomic p-state is derived.•The effect of linear magnetic dichroism in three-photon ionisation of polarised Lithium atom is investigated.•The relative magnitude of the linear magnetic dichroism is expected to be about 30%.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The possibilities and ways for operational tuning of optical lattice parameters, which make it possible to minimise the frequency-standard uncertainties caused by nonlinear, nondipole, and anharmonic ...effects of interaction of magnesium and calcium atoms with the optical lattice field of a magic wavelength, have been investigated.
The development of optical frequency standards with a relative uncertainty of reproducing the time and frequency units at a level as low as 10−17-10−18 calls for an unprecedented accuracy in ...estimating the role of higher orders of optical nonlinearity, caused by the influence of the optical lattice on the frequency shift of the 'clock transition'. This paper presents a systematic calculation of the contributions of multipole nonlinear anharmonic effects to the error of clocks based on optical lattices for alkaline-earth-like Sr, Yb, and Hg atoms.
The correct time to perform an upper endoscopy is decisive in acutely GI bleeding patients. However, patients’ physical status may affect mortality. We speculated that the physical status and ...procedural time could be the principal factors accountable for death-risk. The primary aim was to verify the interaction between physical status and time to endoscopy on mortality; the secondary aim was to verify the interaction of the physical status and time to endoscopy on the length of stay (LOS).
Consecutive patients admitted to 50 Italian hospitals were included. Clinical and endoscopic data were recorded. A multiple logistic regression analysis was performed and the interaction of adjusted clinical physical status and time to endoscopy on mortality was calculated.
Complete data were available for 3.190 patients. The time frames did not interfere with outcomes but influenced LOS. Conversely, the ASA score correlated with mortality, LOS, need for transfusions and rebleeding risk.
Endoscopy time should be tailored to the patient's physical. In our experience, ASA 1–2–3 patients can be safely submitted to endoscopy to reduce the LOS; on the contrary, keen attention should be paid to ASA4 patients, following the ‘not too early-not too late’ rule (12–24 h from admission).
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Multipole, nonlinear and anharmonic effects on the optical-lattice-based clocks of Mg atoms are evaluated theoretically. Dipole polarizabilities, hyperpolarizabilities and multipolar polarizabilities ...for Mg atoms are calculated in the single-electron approximation with the use of analytical presentations for the wave and Green's functions in the modified model-potential approach. For comparison, the data are also given for atoms of the group IIb elements (Zn, Cd, Hg).
The VESPA data access system focuses on applying Virtual Observatory (VO) standards and tools to Planetary Science. Building on a previous EC-funded Europlanet program, it has reached maturity during ...the first year of a new Europlanet 2020 program (started in 2015 for 4 years). The infrastructure has been upgraded to handle many fields of Solar System studies, with a focus both on users and data providers. This paper describes the broad lines of the current VESPA infrastructure as seen by a potential user, and provides examples of real use cases in several thematic areas. These use cases are also intended to identify hints for future developments and adaptations of VO tools to Planetary Science.
•VESPA distributes and searches data related to Solar System studies according to the Virtual Observatory (VO) paradigm.•The current status of the VESPA is described:•Uses case are presented to illustrate the usage of the search interface and tools.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
We investigated the properties of optical lattice clocks operated with a repulsive light-shift potential. The magic wavelength, where light-shift perturbation for the clock transition cancels, was ...experimentally determined to be 389.889(9) nm for 87Sr. The hyperpolarizability effects on the clock transition were investigated theoretically. With minimal trapping field perturbation provided by the blue-detuned lattice, the fractional uncertainty due to the hyperpolarizability effects was found to be 2x10;{-19} in the relevant clock transition.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Compact analytic expressions have been derived by a direct expansion in
ħ
→ 0 for the nonrelativistic amplitude of Coulomb bremsstrahlung radiation (BR), the differential (in frequency and angles of ...the scattered electron) BR cross section, and the triply differential BR cross section that takes into account the bremsstrahlung photon direction and polarization and the scattered electron direction. They contain the classical limit and a quantum correction of the order of
ħ
at an arbitrary BR frequency ω. An explicit expression has been found for the quantum correction of the order of
ħ
to the classical BR spectrum.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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