APS Logo

Ultrafast Molecular Imaging Using 4-Fold Covariance: Coincidence Insight with Covariance Speed

ORAL

Abstract

Momentum resolved coincidence measurements have traditionally served as the gold standard for measuring dissociative ionization of molecules. Covariance measurements can provide similar physical insights and have enabled much higher data taking rates (∼ 100×) [1], allowing for studies as a function of laser intensity, pulse duration, pump-probe delay etc. While powerful, covariance was only demonstrated for up to three particles, limiting its use in Coulomb explosion imaging (CEI) of larger molecules [2]. Here we develop some mathematical tools to compute higher order covariances, and demonstrate four fold covariance for CEI of deuterated formaldehyde (CD2O).

[1] Allum, F., Cheng, C., Howard, A.J., Bucksbaum, P.H., Brouard, M., Weinacht, T. and Forbes, R., 2021. Multi-Particle Three-Dimensional Covariance Imaging:“Coincidence” Insights into the Many-Body Fragmentation of Strong-Field Ionized D2O. The Journal of Physical Chemistry Letters, 12(34), pp.8302-8308.

[2] Zhaunerchyk, V., Frasinski, L.J., Eland, J.H. and Feifel, R., 2014. Theory and simulations of covariance mapping in multiple dimensions for data analysis in high-event-rate experiments. Physical Review A, 89(5), p.053418.

–

Presenters

  • Chuan Cheng

    Stony Brook University, Department of Physics and Astronomy, Stony Brook University

Authors

  • Chuan Cheng

    Stony Brook University, Department of Physics and Astronomy, Stony Brook University

  • Leszek J Frasinski

    Imperial College London

  • Gönenç Moğol

    Stony Brook University

  • Felix Allum

    Stanford Univ, SLAC National Accelerator Laboratory, Stanford University, Stanford PULSE Institute, SLAC National Lab; LCLS, SLAC National Lab

  • Andrew J Howard

    Stanford Univ, Department of Applied Physics, Stanford University

  • Philip H Bucksbaum

    Stanford Univ, Department of Applied Physics, Stanford University, Department of Physics, Stanford University; Department of Applied Physics, Stanford University; Stanford PULSE Institute, SLAC National Lab, Stanford University

  • Mark Brouard

    University of Oxford

  • Ruaridh Forbes

    SLAC - Natl Accelerator Lab, Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford PULSE Institute, SLAC National Lab; LCLS, SLAC National Lab; Department of Physics, Stanford University, SLAC National Accelerator Laboratory

  • Thomas Weinacht

    Stony Brook University, Stony Brook, Department of Physics and Astronomy, Stony Brook University