Strongly coupled intermediate electronic states in one-color two-photon single valence ionization of O2. Academic Article uri icon

abstract

  • We present an experimental and theoretical energy- and angle-resolved investigation on the non-dissociative photoionization dynamics of near-resonant, one-color, two-photon, single valence ionization of neutral O2 molecules. Using 9.3eV femtosecond pulses produced via high harmonic generation and a 3-D momentum imaging spectrometer, we detect the photoelectrons and O2 + cations produced from one-color, two-photon ionization in coincidence. The measured and calculated photoelectron angular distributions show agreement, which indicates that a superposition of two intermediate electronic states is dominantly involved and that wavepacket motion on those near-resonantly populated intermediate states does not play a significant role in the measured two-photon ionization dynamics. Here, we find greater utility in the diabatic representation compared to the adiabatic representation, where invoking a single valence-character diabat is sufficient to describe the underlying two-photon ionization mechanism.

published proceedings

  • J Chem Phys

author list (cited authors)

  • Larsen, K. A., Bello, R. Y., Lucchese, R. R., McCurdy, C. W., Slaughter, D. S., & Weber, T.

citation count

  • 0

complete list of authors

  • Larsen, Kirk A||Bello, Roger Y||Lucchese, Robert R||McCurdy, C William||Slaughter, Daniel S||Weber, Thorsten

publication date

  • January 2023