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Title: Photoelectron angular distributions from rotationally resolved autoionizing states of N 2

The single-photon, photoelectron-photoion coincidence spectrum of N 2 has been recorded at high (~1.5 cm -1) resolution in the region between the N 2 + X 2Σ g +, v + = 0 and 1 ionization thresholds by using a double imaging spectrometer and intense vacuum-ultraviolet light from the Synchrotron SOLEIL. This approach provides the relative photoionization cross section, the photoelectron energy distribution, and the photoelectron angular distribution as a function of photon energy. The region of interest contains autoionizing valence states, vibrationally autoionizing Rydberg states converging to vibrationally excited levels of the N 2 + X 2Σ g + ground state, and electronically autoionizing states converging to the N 2 + A 2Π and B 2Σ u + states. The wavelength resolution is sufficient to resolve rotational structure in the autoionizing states, but the electron energy resolution is insufficient to resolve rotational structure in the photoion spectrum. Here, a simplified approach based on multichannel quantum defect theory is used to predict the photoelectron angular distribution parameters, β, and the results are in reasonably good agreement with experiment.
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [6] ; ORCiD logo [7] ;  [7] ;  [8]
  1. Bryn Mawr College, Bryn Mawr, PA (United States)
  2. Bryn Mawr College, Bryn Mawr, PA (United States); Bowdoin College , Brunswick, ME (United States)
  3. ETH Zurich, Zurich (Switzerland)
  4. Daresbury Lab., Cheshire (United Kingdom)
  5. Univ. Paris-Sud, Univ. Paris-Saclay, Orsay (France)
  6. Synchrotron Soleil, Gif-sur-Yvette (France); Chinese Academy of Sciences, Anhui (China)
  7. Synchrotron Soleil, Gif-sur-Yvette (France)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 147; Journal Issue: 22; Journal ID: ISSN 0021-9606
American Institute of Physics (AIP)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE
Country of Publication:
United States
74 ATOMIC AND MOLECULAR PHYSICS; Photoionization; Photoelectron Spectroscopy; Photoelectron Angular Distributions
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1411991