Photoelectron Metrology (LBNL Oct 2024)
Seminar: Photoelectron Metrology (LBNL, 31st Oct. 2024)
In this seminar I will give an overview of recent work in photoelectron metrology (a.k.a. quantitative photoelectron spectroscopy), in which the main aim is the retrieval of photoionization matrix elements from experimental measurements. The work is enabled by various tools on both the theory and experimental side; recent work has focussed on the development of a suite of open-source python tools - the Photoelectron Metrology Toolkit - and application to various problems, and this will form the main topic of the talk. On the experimental side, time- and angle-resolved photoionization studies of aligned molecules forms the main methodology [1]. New results will be presented, including valence photoionization studies of OCS [2] and N2O. In a similar vein, electronic wavepacket reconstruction has also recently been explored, and will be discussed if time permits [3,4].
For a more comprehensive introduction and review, please see Quantum Metrology with Photoelectrons Vol. 3 (https://phockett.github.io/Quantum-Metrology-with-Photoelectrons-Vol3), an open-source book which introduces and explores the topic, including the code-base and full computational examples.
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[1] Hockett, P. and Makhija, V. (2023) ‘Topical Review: Extracting molecular frame photoionization dynamics from experimental data’, Journal of Physics B: Atomic, Molecular and Optical Physics, 56(11), p. 112001. Available at: https://doi.org/10.1088/1361-6455/acd03e and https://doi.org/10.6084/m9.figshare.20293782.
[2] Woodhouse, J. et al. (2024) ‘Quantitative analysis of aligned molecule photoelectron angular distributions’, In press, Phys. Rev. A. (Data available at https://figshare.com/projects/OCS_alignment_and_photoionization_project_/194090)
[3] Gregory, M. et al. (2022) ‘A laboratory frame density matrix for ultrafast quantum molecular dynamics’, The Journal of Chemical Physics, 157(16), p. 164301. Available at: https://doi.org/10.1063/5.0109607.
[4] Morrigan, L. et al. (2023) ‘Ultrafast Molecular Frame Quantum Tomography’, Physical Review Letters, 131(19), p. 193001. Available at: https://doi.org/10.1103/PhysRevLett.131.193001.
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Note on the files: this presentation was prepared in Jupyter, then exported to Reveal.js slides (HTML format, navigate slides with arrow keys or bottom-left icons on the pages). There are some formatting issues in this case, particularly with the computational example, so please see the source notebook for this part of the talk. Both notebook and html versions require the "images" folder for the static images included in the presentation.
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For further introductory materials:
- Quantum Metrology with Photoelectrons Vol. 3 (HTML version).
- Hockett, Paul, and Varun Makhija. 2023. Topical Review: Extracting Molecular Frame Photoionization Dynamics from Experimental Data. Journal of Physics B: Atomic, Molecular and Optical Physics 56 (11): 112001. Also arXiv 2209.04301. And HTML with interactive figures on Authorea.
- Phase-sensitive Photoelectron Metrology (presentation at DAMOP 2017), video presentation and slides.
