Three-dimensional electron and ion momentum imaging with a double-sided coincidence VMI

Time-resolved experiment, be it at free-electron laser facilities or with table-top laser sources, are often hampered by limited beamtime and/or unstable laser conditions that make it difficult to repeat measurements of different observable under identical conditions. It is therefore beneficial to measure multiple observables during the same scan and possible even in coincidence. I will present several recent examples of electron and ion momentum imaging experiments performed using double-sided coincidence VMI setups [1,2] with free-electron lasers, laboratory HHG sources, and synchrotron radiation with the goal to study ultrafast photochemical reactions in gas-phase molecules [3-5].

[1] B. Erk et al., J. Synchr. Rad. 25, 1529-1540 (2018).

[2] U. Ablikim et al., Rev. Sci. Instr. 90, 055103 (2019).

[3] J.W.L. Lee et al., Nature Communications 12, 6107 (2021)

[4] S. Pathak et al., J. Phys. Chem. Lett. 11, 10205-10211 (2020)

[5] R. Forbes, et al., J. Phys. B. 53, 224001 (2020)