Angular Distributions of $1s\sigma$ Photoelectrons from Fixed-in-Space ${\mathrm{N}}_2$ Molecules

The angular distributions of $1s\sigma$ photoelectrons from ${\mathrm{N}}_2$ molecules held fixed in space have been measured around the ${\sigma }^{*}$ shape resonance for the first time. The angular distributions have been very rich in structure, which are completely different from usual photoelectron angular distributions from randomly oriented molecules, as predicted by Dill. The orbital angular momentum properties of the $1s\sigma$ photoelectrons around the ${\sigma }^{*}$ shape resonance have been made clear from the angular distribution patterns.