A set of parameters describing electron-impact ionization from laser-aligned atoms are reported, which define the "length", "width", and "direction" of the quadruple differential cross section (QDCS) as a function of target alignment kB for fixed ingoing electron momentum k0 and outgoing momenta k1, k2. 24Mg was used, with k0, k1, k2, and kB in the same plane. The parameters are derived for a range of k2 angles, with k1 set at 30° to k0. The QDCS is then determined for all kB. The parameters are very angle sensitive, the QDCS direction varying more than 90° as the length to width ratio varied more than an order of magnitude.
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http://dx.doi.org/10.1103/PhysRevLett.112.023202 | DOI Listing |
Phys Med
December 2024
Physics Dep., Sapienza U. of Rome, p.le Aldo Moro, 2, 00185, Rome, Italy; INFN, Sec. of Rome, p.le Aldo Moro, 2, 00185, Rome, Italy.
Environ Sci Pollut Res Int
December 2024
College of Economics and Environmental Policy, Okinawa International University, Ginowan, Okinawa, 901-2701, Japan.
Per- and polyfluoroalkyl substances (PFAS) are persistent environmental pollutants that have been used for various purposes. Although PFAS can pollute the environment in a variety of areas related to the use, storage, and disposal of their products, there are insufficient data on the extent of PFAS pollution outside industrialized countries with their manufacturing facilities. Most of the analyses depend on high-cost liquid chromatography-tandem mass spectrometry.
View Article and Find Full Text PDFJ Chem Phys
October 2024
LPCT, UMR CNRS 7019, Université de Lorraine, 57000 Metz, France.
The electron-impact ionization of water molecules at low impact energies is investigated using a theoretical approach named M3CWZ. In this model, which considers exchange effects and post-collision interaction, the continuum electrons (incident, scattered, and ejected) are all described by a Coulomb wave that corresponds to distance-dependent charges generated from the molecular target properties. Triple differential cross-sections for low impact energy ionization of either the 1b1 or 3a1 orbitals are calculated for several geometrical and kinematical configurations, all in the dipole regime.
View Article and Find Full Text PDFJ Phys Chem A
October 2024
Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China.
We probe the stability of water clusters by means of their metastable decay probability extracted from two-dimensional reflectron time-of-flight mass spectra. Two different methods are used to ionize and potentially excite the clusters and trigger the evaporation: (i) attachment of electrons with near-zero energies, producing negatively charged clusters, and (ii) electron impact ionization, producing protonated (HO)H clusters. The electron attachment is a soft ionization and therefore provides information about the size distribution of the neutral clusters in the beam due to a very limited amount of post-ionization loss of water molecules.
View Article and Find Full Text PDFJ Chem Phys
September 2024
MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China.
The three-body fragmentation dynamics of benzene trications C6H63+ induced by 200 eV electron-impact produced by a photoemission cathode is investigated. All three fragment ions are detected in coincidence, and their momentum vectors are determined by employing a COLTRIMS reaction microscope. The detailed kinematical information of three deprotonation fragmentation channels of H+ + C3H2+ + C3H3+, H+ + C2H3+ + C4H2+, and H+ + C2H2+ + C4H3+ are obtained.
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