The role of dipole-forbidden autoionizing resonances in non-resonant one-color two-photon single ionization of N$_2$

• URL: http://arxiv.org/abs/2009.08669v2
• Date: Tue, 29 Dec 2020 06:19:29 GMT
• Title: The role of dipole-forbidden autoionizing resonances in non-resonant one-color two-photon single ionization of N$_2$
• Authors: Kirk A. Larsen, Roger Y. Bello, Robert R. Lucchese, Thomas N. Rescigno, C. William McCurdy, Daniel S. Slaughter, Thorsten Weber
• Abstract summary: We present an experimental and theoretical study on the photoionization dynamics of non-resonant one-color two-photon single ionization of neutral N$for$ molecules. Using 9.3 eV photons produced via high harmonic generation and a 3-D momentum imaging spectrometer, we detect the photoelectrons and ions produced from one-color two-photon ionization in coincidence.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present an experimental and theoretical energy- and angle-resolved study on the photoionization dynamics of non-resonant one-color two-photon single valence ionization of neutral N$_2$ molecules. Using 9.3 eV photons produced via high harmonic generation and a 3-D momentum imaging spectrometer, we detect the photoelectrons and ions produced from one-color two-photon ionization in coincidence. Photoionization of N$_2$ populates the X $^2\Sigma^+_g$, A $^2\Pi_u$, and B $^2\Sigma^+_u$ ionic states of N$_2^+$, where the photoelectron angular distributions associated with the X $^2\Sigma^+_g$ and A $^2\Pi_u$ states both vary with changes in photoelectron kinetic energy of only a few hundred meV. We attribute the rapid evolution in the photoelectron angular distributions to the excitation and decay of dipole-forbidden autoionizing resonances that belong to series of different symmetries, all of which are members of the Hopfield series, and compete with the direct two-photon single ionization.

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