Direct observation of C60− nano-ion gas phase ozonation via ion mobility-mass spectrometry
Literature Information
Christopher J. Hogan Jr
Improved methods to probe the reactivity of nano-ions, such as C60−, would find utility in nanochemistry, combustion chemistry, and in generally understanding the behavior of matter at the nanometer scale. We demonstrate that ion mobility-mass spectrometry (IM-MS) with a low-field differential mobility analyzer can be used to probe nano-ion reaction kinetics. We used the developed IM-MS approach to examine the gas phase reactivity of C60− ions with ozone at atmospheric pressure. Experimental results show that ozonation of C60− mainly leads to the formation of C60On−. The controlled reaction time within the ion mobility instrument enables calculation of ozonation reaction rates and assuming oxygen atoms are added sequentially, we find that the reaction rate between C60− and O3 is near the collision controlled limit. We propose an exponentially decaying reaction rate coefficient expression to describe ozonation leading to the addition of >20 oxygen atoms. At high ozone concentrations, CO or CO2 loss from C60On− is additionally observed.
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