High-resolution measurement of resonances in eO2 scattering by electron time-of-flight spectroscopy

James E. Land and Wilhelm Raith
Phys. Rev. A 9, 1592 – Published 1 April 1974
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Abstract

Resonances in the eO2 total cross section in the energy range 50-300 meV were studied with a high-resolution (ΔE<10 meV) electron time-of-flight spectrometer. Each vibrational resonance was found to have a well-resolved doublet structure, which has not previously been observed, and which is due to spin-orbit coupling in the Πg2 ground state of O2. The spin-orbit coupling constant of O2 was measured to be |A|=20±2 meV=161±16 cm1, in agreement with theoretical estimates. On an energy scale established from the measured electron flight times, the energy of the center of the v=4 resonance was measured to be 91 ± 5 meV. This value is in agreement with a recent photodetachment measurement of the electron affinity of O2, and with a previously observed accidental coincidence between the v=3 level of O2 and the v=8 level of O2. The electron time-of-flight spectrometer is described in detail.

  • Received 4 October 1973

DOI:https://doi.org/10.1103/PhysRevA.9.1592

©1974 American Physical Society

Authors & Affiliations

James E. Land* and Wilhelm Raith

  • J. W. Gibbs Laboratory, Yale University, New Haven, Connecticut 06520

  • *Present address: Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colo. 80302.
  • Present address: Universität Bielefeld, Fakultät für Physik, D-48 Bielefeld, Viktoriastrasse 44, West Germany.

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Vol. 9, Iss. 4 — April 1974

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