Abstract
It is experimentally challenging to generate nano-sized metal oxide clusters with significant intensity as well as to resolve a single hydrogen atom by mass spectrometry (TOF-MS). Herein, the high-resolution tandem time-of-flight mass spectrometer is home-made and the experimental apparatus is capable to perform the reactivity study of nano-sized vanadium oxide clusters. The formation and distribution of nano-sized vanadium oxide cluster anions VxOy− (x up to 70) were analyzed and the photoreaction of alkene attached complex V40O101C2H4− (or V40O101C3H6−) was studied. Larger VxOy− cluster anions can be generated typically under higher O2 concentration and the intensity proportion (%) of vanadium oxide cluster with a certain oxygen-deficiency value Δ (Δ= 2y-5x-1 for VxOy−) in each Vx series is nearly invariant. In photoreaction of V40O101C2H4− (or V40O101C3H6−), the transfer of two oxygen atoms from V40O101− to C2H4 (or C3H6) and the generation of V40O99− dominants the channel. The mass resolution of the primary TOF-MS for V40O101− (∼1.5nm) is up to 13002. The mass resolution of the secondary TOF-MS for photoreaction is calculated to be about 4530 to resolve parent (V40O101C2H4−) and daughter ions (V40O99−).
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