Separating the Vibrationally Resolved Auger Decay Channels for a CO Core Hole State

V. Ulrich,T. Lischke,A. M. Bradshaw,U. Hergenhahn,S. Joshi,S. Barth

doi:10.1103/physrevlett.100.143003

V. Ulrich, T. Lischke + Show 4 more

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https://doi.org/10.1103/physrevlett.100.143003

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Abstract

The K-VV Auger spectrum of carbon monoxide (CO) excited by C 1s photoionization has been investigated with a novel electron-electron coincidence setup. The energy resolution is sufficiently high to resolve the vibrational energy levels of the core-ionized intermediate state and of most dicationic final states in the two-dimensional electron energy map. We demonstrate how the influence of vibrational states on a molecular Auger spectrum can be accessed experimentally without the constraint of averaging over all intermediate state energies.

Highlights

The quantitative description of molecular orbitals and nuclear configuration began 70 years ago, it still poses a great challenge to theorists
The combined influence of the vibrational structure in the intermediate and final states is typically subsumed in current Auger theory by a shift and a Gaussian broadening of the electronic transitions [3]
In this Letter we report photoelectron-Auger electron coincidence measurements on carbon monoxide (CO) after C 1s ionization by synchrotron radiation

Summary

Introduction

The quantitative description of molecular orbitals and nuclear configuration began 70 years ago, it still poses a great challenge to theorists. The combined influence of the vibrational structure in the intermediate and final states is typically subsumed in current Auger theory by a shift and a Gaussian broadening of the electronic transitions [3]. Our energy resolution allows the vibrational structure of the intermediate C 1sÿ1 state and of most of the final CO2 states to be resolved.

Results

Conclusion