The spectroscopy of Rydberg excited iodine-argon van der Waals complexes

• Published in: Chemical physics letters 1993-10, Vol.214 (1), p.27-33
• Main Authors: Cockett, M.C.R., Goode, J.G., Lawley, K.P., Donovan, R.J.
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Autoionization, photoionization, and photodetachment; Exact sciences and technology; Molecular properties and interactions with photons; Photon interactions with molecules; Physics
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/0009-2614(93)85450-3

The Rydberg excited I 2-Ar complex formed in a supersonic free jet has been observed using mass resolved (2+1 ) REMPI spectroscopy. The present work has concentrated on the [ 2Π 3 2 ] g 7s, Ω= 1, 2 Rydberg series of I 2-Ar. The spectrum exhibits anharmonic progressions in the I 2…Ar van der Waals stretching mode for each Rydberg state with ω e values of 59±2 and 53±2 cm −1 for the two states. The corresponding zero-point dissociation energies, calculated from the observed spectral red-shifts were determined to be 568±5 and 504±5 cm −1. All the experimental data indicate that the complex has a T-shaped geometry in both Rydberg states.