Photoionization of ArKr, ArXe, and KrXe and bond dissociation energies of the rare gas dimer ions

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.443721· OSTI ID:7040105

Dehmer, Patricia M. ^[1]; Pratt, Stephen T. ^[1]

---

1. Argonne National Laboratory (ANL), Argonne, IL (United States)

The relative photoionization cross sections for the heteronuclear rare gas dimers ArKr, ArXe, and KrXe are reported at a wavelength resolution of 0.15 to 0.28 Å in the energy region between the molecular ionization threshold and the atomic ²P⁰_1/2 ionization limit of the lighter rare gas atom. The dimer ionization potentials are 13.484 ± 0.015 eV for ArKr, 11.968 ± 0.012 eV for ArXe, and 11.763 ± 0.011 eV for KrXe. Combining these values with the known values of the atomic ionization potentials and the neutral ground state dissociation energies yields values for the A ²Σ⁺_1/2 ionic ground state dissociation energies of 0.528 ± 0.015 eV for ArKr, 0.176 ± 0.012 eV for ArXe, and 0.385 ± 0.011 eV for KrXe. Molecular Rydberg structure in the region between the atomic fine structure thresholds is analyzed in terms of Rydberg series converging to the B ²Π_1/2 or D ²Σ⁺_1/2 states of the dimer ions. Molecular Rydberg structure in other regions of the spectrum is extremely complex and, in many cases, long vibrational progressions are observed that are only partially analyzable with the present resolution. Tables are presented summarizing the best experimental values of bond dissociation energies for the ground and excited states of all of the homonuclear and heteronuclear rare gas dimer ions.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE; Office of Naval Research
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7040105
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 10 Vol. 77; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
CROSS SECTIONS
DIMERS
DISSOCIATION ENERGY
ELEMENTS
ENERGY
FLUIDS
GASES
IONIZATION
IONIZATION POTENTIAL
KRYPTON
NONMETALS
PHOTOIONIZATION
RARE GASES
XENON