Seconded from Biotechnology Research Institute, NRC, Montreal, Canada.
Collision-induced dissociation of Cs4I. An Example of Superelastic Collisions?†
Article first published online: 8 APR 2005
Copyright © 1989 Heyden & Son Ltd
Rapid Communications in Mass Spectrometry
Volume 3, Issue 8, pages 267–272, August 1989
How to Cite
Alexander, A. J., Thibault, P. and Boyd, R. K. (1989), Collision-induced dissociation of Cs4I. An Example of Superelastic Collisions?. Rapid Commun. Mass Spectrom., 3: 267–272. doi: 10.1002/rcm.1290030806
NRCC No. 30321.
- Issue published online: 8 APR 2005
- Article first published online: 8 APR 2005
- Manuscript Received: 15 JUN 1989
- Manuscript Accepted: 15 JUN 1989
The collision-induced dissociation (CID) of Cs4I to form Cs3I has been investigated by mass-analysed ion kinetic energy spectroscopy, When helium was used as collision gas the CID process was accompanied by sizable loss of translational energy in the collisional-activation step. However, use of krypton or xenon as collision gas yielded product ions with translational energies higher than that observed for unimolecular reaction in the absence of collision gas. Neon and argon provided intermediate behaviour. Extensive experiments designed to investigate possible explanations for these observations left superelastic collisions of an excited state as the only possibility. Since nothing is known about the structures and electronic states of species like Cs4I, the necessarily speculative discussion is based upon general considerations of coupling of translational and electronic energies via crossings between states of the transitory collision complex. These observations emphasise the complexity of the possible processes which can occur as a result of collisions in the keV range.