[Nexus] NeXus for time-resolved, soft x-ray experiments

[Ronningen, TJ]

Our user facility is adopting NeXus to support our mix of soft x-ray, time resolved experiments. If anyone already has mappings that relate to our specific experiments, I’d be interested to review them as an example and/or discuss the mapping choices we are assessing.

Key technical background for our experiments:

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Ultrafast time resolution with pump-probe experiments
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XUV/Soft x-ray probe pulses, generated by high harmonic generation, energy range of 10 to 200 eV
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High harmonic generation driven by infrared (1030 nm) pulsed laser sources with pulses compressed to 250, 40, or 8 fs duration
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Tunable pulsed laser sources as pump sources
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Variety of end stations for sample analyses

Plan so far:

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Use NXoptical_spectroscopy for static and time-resolved transmittance and reflectance spectroscopy experiments
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Use NXstm and NXsts (contributed definitions) for static and time-resolved STM experiments. We have completed a first implementation of this and are happy with it
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Use NXmpes_arpes for static and time-resolved ARPES experiments
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For time-resolved measurements, add a scan dimension to the data sets linked to the delay stage position that is controlling the pump-probe time delay

Main questions so far:

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Our transmittance and reflectance measurements could be treated as “NXxas” and “NXref”. At our energies, our approach is better matched to “NXoptical_spectroscopy”. Instead of a scanning monochromator, we use a dispersive grating to measure the transmitted/reflected spectrum on a CCD. Have other facilities taken one approach or the other for our photon energy range?
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NXsource does not include high harmonic generation as a standard type, so I plan to implement it as a custom type. Has anyone else already implemented this as custom type?




Best regards,

TJ Ronningen



TJ Ronningen, PhD
Facility Manager, NSF NeXUS
The Ohio State University
Office of Research NeXUS Facility

1110 Newman & Wolfrom Lab,100 W 18th Ave, Columbus, OH 43210
614-746-2398 Mobile
ronningen.1 at osu.edu<mailto:ronningen.1 at osu.edu> / nsf-nexus.osu.edu<https://nsf-nexus.osu.edu/>
Pronouns: he/him/his / Honorific: Dr.

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