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Isotope effects in the electron impact ionization of H2/D2, H2O/D2O, and C6H6/C6D6 near threshold (2002)

Hanel, G. ; Gstir, B. ; Fiegele, T. ; [et al.]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 116 (2002), S. 2456-2463

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: Appearance energies of all parent ions and several fragment ions produced by electron impact ionization of the isotope systems H2/D2, H2O/D2O, and C6H6/C6D6 were determined with high precision using a dedicated high-resolution electron impact ionization mass spectrometer. The determination of the appearance energies from scans of the ion signal as a function of electron energy in the near-threshold region of each ion utilized a fitting and analysis procedure that has recently been successfully applied to the determination of appearance energies of singly and multiply charged rare-gas ions and several molecular ions and cluster ions. The experimentally determined appearance energies are in good agreement (i) with theoretical calculations that we carried out using standard quantum chemistry codes and (ii) with appearance energy values listed in standard reference data tables (to the extent that tabulated values are available). We find isotope shifts for all three systems ranging from a few meV for the parent ions to a few hundred meV for the fragment ions. The deuterated species always have the higher appearance energy. The present results for H2O/D2O and C6H6/C6D6 do not confirm the larger isotope effects that were reported earlier by Snegursky and Zavilopulo [Nucl. Instrum. Meth. Phys. Res. B 126, 301 (1997)]. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1428341

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Silicide und Germanide mit Gd6Cu8Ge8-Struktur (1970)

Hanel, G. ; Nowotny, H.

Springer

Monatshefte für Chemie 101 (1970), S. 463-468

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ISSN: 1434-4475

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Abstract The compounds {Sc,Y,Tb,Dy,Ho,Er,Tm,Yb,Lu}6Cu8Si8 and {Y,Yb}6Cu8Ge8 have been prepared. They were found to be analogous with the Gd6Cu8Ge8-structure type. The lattice parameters have been determined.

Notes: Zusammenfassung Die Verbindungen {Sc,Y,Tb,Dy,Ho,Er,Tm,Yb,Lu}6Cu8Si8 sowie {Y,Yb}6Cu8Ge8 werden hergestellt. Diese sind isotyp mit der Gd6Cu8Ge8-Struktur. Die Gitterparameter werden ermittelt.