# Single photoionization of the Zn II ion in the photon energy range 17.5 to 90.0 eV: experiment and theory

## TL;DR

This study combines high-resolution experimental measurements and advanced theoretical calculations to analyze the photoionization cross section of Zn$^+$ ions across a broad photon energy range, revealing resonance states and metastable contributions.

## Contribution

It provides the first detailed comparison of experimental data with Dirac-Coulomb R-matrix calculations for Zn$^+$ photoionization, identifying resonance states and metastable effects.

## Key findings

- Resonance states dominate below 30 eV
- Experimental and theoretical results show good agreement
- Metastable state contributions are quantified

## Abstract

Measurements of the single photoionization cross section of Cu-like Zn$^+$ ions are reported in the energy (wavelength) range 17.5 eV (709 \AA) to 90 eV (138 \AA). The measurements on this {\it trans}-Fe element were performed at the Advanced Light Source synchrotron radiation facility in Berkeley, California at a photon energy resolution of 17 meV using the photon-ion merged-beams end-station. Below 30 eV the spectrum is dominated by excitation autoionizing resonance states. The experimental results are compared with large-scale photoionization cross-section calculations performed using a Dirac-Coulomb $R$-matrix approximation. Comparison are made with previous experimental studies, resonance states are identified and contributions from metastable states of Zn$^+$ determined.