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A schematic diagram for the experimental apparatus. The molecular beam machine consists of two vacuum chambers and a photoionization TOF MS, which are pumped by a 10-, 6-, and 2-inch (1 in = 2.54 cm) diffusion pump, respectively. The source chamber contains a high-temperature pulsed nozzle (A), and the photoionization TOF MS consists of an ion optics assembly (B), a set of microchannel plate detectors (C) for both linear and reflectron mode detection, and a deflector (D).
