Fig. 1: tr-APXPS experimental set-up with data acquisition flow using a 2D delay-line detector. | Nature Communications

Fig. 1: tr-APXPS experimental set-up with data acquisition flow using a 2D delay-line detector.

From: Resolving active species during the carbon monoxide oxidation over Pt(111) on the microsecond timescale

Fig. 1

a O2 and CO gases are separately introduced facing a Pt(111) crystal in the analysis chamber. O2 flow is set by a mass flow controller (MFC) and CO is pulsed at a specific frequency ω, using a piezo valve synchronized to a delay-line detector (DLD) via a function generator. Using this set-up, event-averaged 2D plots of XPS data with a time axis defined by the pulsing frequency (1/ω) are obtained. b Simplified visualization of tr-APXPS data acquisition where each time channel is measured at one kinetic energy (KE) channel before sweeping over another kinetic energy channel and measuring all time points. This procedure repeats until all kinetic energy channels are measured. Data collection continues as described until a sufficient signal-to-noise ratio is reached as defined by the user. An example 2D plot of the C 1s gas phase is presented with a side view of the CO pulse profile detailing regions of interest.

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