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Atomic partial wave meter by attosecond coincidence metrology.
Nat Commun
August 2022
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
Attosecond chronoscopy is central to the understanding of ultrafast electron dynamics in matter from gas to the condensed phase with attosecond temporal resolution. It has, however, not yet been possible to determine the timing of individual partial waves, and steering their contribution has been a substantial challenge. Here, we develop a polarization-skewed attosecond chronoscopy serving as a partial wave meter to reveal the role of each partial wave from the angle-resolved photoionization phase shifts in rare gas atoms.
View Article and Find Full Text PDFEvaluation of an online, real-time, soft-photon ionisation time-of-flight mass spectrometer for mainstream tobacco smoke analysis.
BMC Chem
December 2019
Photonion GmbH, Hagenower Str. 73, 19061 Schwerin, Germany.
Mainstream tobacco smoke is a complex and dynamic aerosol, consisting of particulate and vapour phases. Most approaches to determine mainstream smoke toxicant yields are based on offline techniques that limit the opportunity to observe in real time the processes leading to smoke formation. The recent development of online real-time analytical methods offers many advantages over traditional techniques.
View Article and Find Full Text PDFThe article contains detailed analysis of current scientific approaches and practical achievements in organizing personal protection of the personnel working in conditions of external radiation exposure and air and surface contamination with radioactive substances. The ways of improvement of personal protection equipment are described. The incorrectness of attempts to create PPE from gamma radiation with the energy of over 0,1 MeV--which are currently quite common--is shown.
View Article and Find Full Text PDFPhotoelectron angular distributions and cross section ratios of two-color two-photon above threshold ionization of argon.
J Phys Chem A
November 2009
Department of Chemistry, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
Anisotropy parameters and cross section ratios of two-color two-photon above threshold ionization sidebands from argon are measured using photoelectron velocity map imaging with the selected 13th or 15th high-order harmonics in a perturbative 800 nm dressing field. A new data analysis technique determines accurate anisotropy parameters of the photoelectron angular distributions for each sideband by subtracting a sequence of percentages of the single-photon ionization background from the above threshold ionization signal to correct for the angular averaging of overlapping photoelectron energies. The results provide a fundamental test of theoretical predictions based on second-order perturbation theory with a one-electron model and the soft-photon approximation and show agreement with theory for the cross section ratios.
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