Abstract
We have measured the main line (single hole) C $1s$ photoionization cross sections for ${C}_{2}{H}_{2}$, ${C}_{2}{H}_{4}$, and ${C}_{2}{H}_{6}$ in the immediate threshold region. These three molecules occupy a central place in the proposed correlation between shape resonance position and molecular geometry. We find no clearly identifiable shape resonances in the single hole cross sections of ${C}_{2}{H}_{4}$ and ${C}_{2}{H}_{6}$ and only weak evidence for one in ${C}_{2}{H}_{2}$.
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