Ultrashort, deep-ultraviolet pulses by resonant dispersive wave emission from hollow capillary fibres for time-resolved photoelectron imaging S.L. Jackson 1 , N. Kotsina 1 , C Brahms 1 , J.C. Travers 1 , D. Townsend 1,2 1 Institute of Photonics & Quantum Sciences, Heriot-Watt University, UK, 2 Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, UK We exploit the phenomenon of resonant dispersive wave (RDW) emission in gas-filled hollowcapillary fibres to realise time-resolved photoelectron imaging (TRPEI) measurements with anextremely short temporal resolution of just 10 and 11 fs at central pump wavelengths of 250 and 280nm, respectively. This first demonstration of the application of RDW pulses to spectroscopyrepresents an advance in the current state of the art for ultrafast photoelectron imaging. We alsopresent an initial TRPEI measurement investigating the excited-state photochemical dynamicsoperating in the N-methylpyrrolidine molecule. Looking forward, we present work in progress onupgrading our system to higher UV conversion efficiencies and shorter temporal durations
Figure 1. Left: Time-dependent photoelectron spectrum of 1,3-butadiene obtained using a250 + 800 nm, 1 + 3’ ionization scheme. A photoelectron image obtained close to zeropump–probe delay is inset. Right: The energy integrated photoelectron transient with aGaussian fit is shown in red with the temporal full-width half-maximum labelled. References 1. Kotsina, N. et al., Chemical Science volume 13, 9586, 2022
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