Fourier transform ion cyclotron resonance studies of the unimolecular dissociation of gas phase cluster ions
Conference
·
OSTI ID:126110
- Univ. of Waterloo, Ontario (Canada)
Although Fourier Transform Ion Cyclotron Resonance (FTICR) Spectrometry is widely acknowledged as a valuable technique for the study of bimolecular reactions of gas phase ions it is less well known as a technique with unique capabilities for the examination of unimolecular dissociations of both {open_quotes}stable{close_quotes} and {open_quotes}metastable{close_quotes} ions. Examples of experiments will be given which show that unimolecular dissociation of ions with lifetimes ranging from microseconds to hundreds of seconds can be readily studied using FTICR techniques. For example, unimolecular dissociation rate constants for transient adduct species can be derived from the pressure dependence of the apparent bimolecular rate constant for formation of the corresponding collisionally stabilized adduct. In addition, a new technique, Metastable Ion Cyclotron Resonance (MICR), can be used to examine product distributions of decomposing metastable ions as a function of the metastable lifetime for lifetimes ranging from 50 ps upwards. Finally, exceedingly slow, IR induced, thermal unimolecular dissociation of stable cluster ions external high pressure source can be readily examined.
- OSTI ID:
- 126110
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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