| Autor: |
Schmidt, Eric G., Arkin, C. Richard, Laude, D. A. |
| Zdroj: |
Journal of Mass Spectrometry; October 2000, Vol. 35 Issue: 10 p1191-1196, 6p |
| Abstrakt: |
In the first application of quadrupolar excitation (QE) to the remeasurement of small ions, a remeasurement efficiency for benzene ions of 95% was achieved. The remeasurement experiment was optimized for excitation radius, static helium collisional cooling gas pressure and quadrupolar excitation amplitude. During initial studies conducted with benzene, it was found that maintaining an ion excitation that utilizes 12% of the full cell radius minimizes the effects of the non-quadrupolar potential in a small cell. Optimization of the benzene remeasurement experiment permits the real-time monitoring of an ionmolecule reaction, specifically the broadband QE remeasurement of the self-chemical ionization of toluene. A single population of the benzyl precursor ion is monitored for over 100 s as it reacts to produce xylyl ion. More than 30 min would be required to acquire the same quantity of data by the conventional methods in which a new ion population must be generated for each reaction time studied; this results in a 90% decrease in the amount of time required to generate an ionmolecule reaction profile. This work demonstrates the first use of broadband QE remeasurement as a method for monitoring an entire low-mass, gas-phase ionmolecule reaction from a single population of ions. Copyright © 2000 John Wiley & Sons, Ltd. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Plný text