Experimental Procedure and Spectrometer Description Sample Clauses

Experimental Procedure and Spectrometer Description. The data presented here were recorded using photoelectron velocity map imaging spectroscopy. The details of the technique have been described extensively in other publications.47-49 The imaging apparatus used in this study was modified from an existing setup described elsewhere.50 Only the new additions to the current spectrometer are discussed in detail here. Figure 2.1 shows a diagram of the apparatus used to study BeO-. Anions were produced in a laser ablation source51 using a beryllium rod target and the focused, frequency doubled output of a Nd:YAG laser (532nm, ~8mJ). This source was coupled to a pulse valve that delivered 70%/30% Ne/He carrier gas seeded with 2.5% N2O at a backing pressure of 55 psia. The anions produced by the ablation process were supersonically expanded into a differentially pumped vacuum chamber, where a Wiley-McLaren time of flight mass spectrometer (WM-TOFMS)52, in a perpendicular orientation with respect to the direction of the expansion, was housed. Fast rising, negative pulsed voltages were applied to the repeller and extractor of the WM-TOFMS by high voltage switches, accelerating the anions into a drift region to allow for mass separation before reaching the photodetachment region of the velocity map imaging optics. The resolution of the mass spectrometer was m/∆m= 690 at masses around 40 amu.
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