  Photoelectron emission microscopy PEEM is a powerful tool to
spectroscopically image dynamic surface processes at the nanoscale but is
traditionally limited to ultra high or moderate vacuum conditions. Here, we
develop a novel grapheme capped multichannel array sample platform that extends
the capabilities of photoelectron spectromicroscopy to routine liquid and
atmospheric pressure studies with standard PEEM setups. Using this platform, we
show that graphene has only a minor influence on the electronic structure of
water in the first few layers and thus will allow for the examination of
minimally perturbed aqueous phase interfacial dynamics. Analogous to microarray
screening technology in biomedical research, our platform is highly suitable
for applications in tandem with large-scale data mining, pattern recognition,
and combinatorial methods for spectro temporal and spatiotemporal analyses at
solid liquid interfaces. Using Bayesian linear unmixing algorithm, we were able
to discriminate between different X-ray induced water radiolysis scenarios and
observe a metastable wetting intermediate water layer during the late stages of
bubble formationformation
