Spectroscopic Implications for [N–X–N]+ (X = I, Br)-Type Halonium Compounds with Formal Hypervalency | Inorganic Chemistry pubs.acs.org/doi/10.1021/... Muramatsu, Inokuchi, and co-workers @InorgChem #bispyridine #halonium #hypervalency #UVPD #CT #vibronic #DFT