Spectroscopic identification of the Ar⋯I2 intermolecular levels bound throughout the Ar + I2(B,ν′) potential

- Action spectra were used to identify Ar⋯I2(B,ν′) vibrational levels.
- At least 17 Ar⋯I2(B,ν′ = 21) intermolecular vibrational levels were identified.
- The Ar⋯I2(B,ν′) complexes dissociate into the highest-energy Ar + I2(B,ν) products.