Abstract
We describe in detail a high-temperature octopole/collision cell apparatus for studying ion–molecule reactions involving nonvolatile target species, including metals. The system can be operated at temperatures up to ∼1200 K and features coaxially heated octopole rods and a heated collision cell in which the vapor of a nonvolatile target material is generated by evaporation from a bulk sample contained therein. The poles are heated independently of the cell and are maintained at a higher temperature to prevent condensation of the sample on the poles. This ensures a well characterized operating temperature that is necessary for absolute cross-section measurements. The apparatus design permits two independent methods for the determination of the target vapor density. The absolute Na+N2+ charge transfer cross section has been measured for collision energies in the range 0.1–2.25 eV. These results represent the first guided-ion beam measurement of an absolute ion–metal atom reaction cross section, and are compared to earlier studies conducted with other methods.
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