Thermal activation of stored ions in a quadrupole ion trap
Conference
·
OSTI ID:210622
- Oak Ridge National Lab., TN (United States)
Trapped ion techniques offer a unique opportunity to probe the nature of isolated ions in the gas phase. The authors adapted an electrospray/atmospheric glow discharge quadrupole ion trap combination to allow for a heated vacuum system. By increasing the temperature and the average collisional energy, the authors studyied changes in the dissociation behavior and the ion-molecule reactivity of ions as a function of temperature. The temperature plays a role in both the activation of unimolecular fragmentation and desolvation phenomena. This set-up has allowed acquisition of ESI mass spectra of multiply-charged Horse Heart Myoglobin and exploration of its dissociation behavior as a function of bath gas temperature. Thermal activation which raises the internal energy of the ion, also affects intermolecular interactions such as the solvation of a multiply-charged ion by a large number of neutral species. Raising the temperature of multiply-charged species will {open_quotes}heat{close_quotes} them above the binding energy of the weakly bound neutral species, thus desolvating the ion. The authors have observed this process during the thermal activation of multiply-charged Horse Heart Myoglobin.
- OSTI ID:
- 210622
- Report Number(s):
- CONF-9505261--
- Country of Publication:
- United States
- Language:
- English
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