Probing doubly excited ionic states of [Formula Presented] via a triple excitation above the N [Formula Presented] threshold in the [Formula Presented] molecule

R. Feifel, K. Ueda, A. De Fanis, K. Okada, S. Tanimoto, T. Furuta, H. Shindo, M. Kitajima, H. Tanaka, O. Björneholm, L. Karlsson, S. Svensson, S. L. Sorensen

Research output: Contribution to journalArticle

Abstract

Angle-resolved resonant Auger-electron spectroscopy has been carried out on the nitrogen molecule at selected photon energies around 419 eV, where a [Formula Presented] core electron and two valence electrons are promoted into the lowest unoccupied molecular orbital [Formula Presented] Significant enhancement of a specific band, which cannot be disentangled in direct photoionization, is observed at a binding energy of 37.6 eV, with a value of the anisotropy parameter [Formula Presented] much smaller than 2. We assign this new band to the transition to a doubly excited cationic state of [Formula Presented] in which two of the excited valence electrons remain in the [Formula Presented] orbital, proposing a “double spectator” type decay mechanism. This observation shows how to preferentially probe multiply excited configurations of cations using multiple resonant excitation.

Original languageEnglish
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume67
Issue number3
DOIs
Publication statusPublished - 2003

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Feifel, R., Ueda, K., De Fanis, A., Okada, K., Tanimoto, S., Furuta, T., Shindo, H., Kitajima, M., Tanaka, H., Björneholm, O., Karlsson, L., Svensson, S., & Sorensen, S. L. (2003). Probing doubly excited ionic states of [Formula Presented] via a triple excitation above the N [Formula Presented] threshold in the [Formula Presented] molecule. Physical Review A - Atomic, Molecular, and Optical Physics, 67(3). https://doi.org/10.1103/PhysRevA.67.032504