SNAPSHOT SPECTROSCOPY
The delay line detector provides >100 energy channels and can be used to acquire spectra in either scanned or snapshot (unscanned) modes. In traditional scanned mode the energy of the input lens and analyser is scanned so that every DLD channel detects photoelectrons corresponding to each energy step of the scan. In snapshot mode, the input lens is used to define the photoelectron energy detected. Due to the energy dispersion of photoelectrons traversing the hemispherical analyser, a spectrum can be acquired using the energy channels of the DLD without scanning the input lens or analyser. The result is a spectrum acquired within seconds. This is demonstrated in the figure below, which shows a C1s snapshot spectrum acquired from a 15µm area of clean PET. The fast spectral acquisition of snapshot mode also improves the data acquisition efficiency during sputter depth profiling. Spectra are acquired for each elemental region in seconds without scanning the analyser during acquisition. This greatly reduces the cycle time leading in turn to faster depth profiling capability. An example of snapshot spectra acquired during a depth profile through an inorganic/organic multilayer is also shown.

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