Data set pertaining to the article "Quantitative electronic structure and work-function changes of liquid water induced by solute" | Physical Chemistry Chemical Physics, 24, 1310 (2022). Files with extension .h5 are hdf5-files structured according to the NeXus standard v2022.07 using the NXmpes user contributed format suggested by the Fairmat consortium, see https://www.nexusformat.org/ https://fairmat-experimental.github.io/nexus-fairmat-proposal/50433d9039b3f33299bab338998acb5335cd8951/mpes-structure.html A few extensions specific to liquid jet-experiments were added to the standard, and are explained in the notes-group on the top level of each file. NeXus data files can be opened with any software capable of opening hdf5-structured files. The following viewers are adapted to the specifics of the NeXus data format: * nexpy (distributed with python) * https://h5web.panosc.eu/h5wasm (web-based NeXus viewer maintained by the European Photon and Neutron Open Science Cloud-consortium) In each NeXus file-entry, two types of spectra are shown: 1. Sweep-averaged spectra, integrated over the non-dispersive coordinate of our detector ('data'). 2. As-measured data ('raw'). Files with extension .txt are comma-separated ascii-files. The following files are provided: Photoemission data pertaining to solute measurements using the cut-off as energy reference: NaI_data.h5 tbai_data.h5 Biased spectra were typically recorded in the following order: [cut-off (fine), cut-off (coarse), (valence band)*(N repeats)]*(M repeats) To avoid the saving of overly complex hdf5-files, these data were saved in a different order, namely: [cut-off (fine)*(M repeats), cut-off (coarse)*(M repeats), (valence band)*(N*M repeats)]. Numeric representations of the traces shown in the article's figures: Figure_1a-data.txt Figure_1b-data.txt Figure_2a-data.txt Figure_2b-data.txt Figure_2c-data.txt Figure_3-data.txt Figure_4-data.txt Figure_5a-data.txt Figure_5b-data.txt Figure_6a-data.txt Figure_6b-data.txt Figure_6c-data.txt Figure_7_diff_spectra-data.txt Figure_8-data.txt Traces shown in several figures are included only in the data file pertaining to the figure in which they occur first. Contact: Uwe Hergenhahn, uhe@fhi.mpg.de .

Funding acknowledgements: SNF (project 200021E-171721). Deutsche Forschungsgemeinschaft (Wi 1327/5-1). European Research Council (ERC) under the European Union's Horizon 2020 research and investigation programme (grant agreement No. 883759. Max-Water initiative of the Max-Planck-Gesellschaft. JSPS KAKENHI Grant No. JP20K15229.