Unusual geometries and spectroscopic properties of electronic states of In2N2

In contrast to other tetraatomic III-V clusters, In2N2 exhibits two nearly degenerate T-shaped 3B1 states that are found to be the ground state candidates followed by a low-lying linear In-In-N-N 3Σ− state. The 1Ag state with a rhombus structure was found to be 0.94 eV higher.