Multiphoton Ionization as a clock to Reveal Molecular Dynamics with Intense Short X-ray Free Electron Laser Pulses

Abstract

We investigate molecular dynamics of multiple ionization in N2 through multiple core-level photoabsorption and subsequent Auger decay processes induced by intense, short X-ray free electron laser pulses. The timing dynamics of the photoabsorption and dissociation processes is mapped onto the kinetic energy of the fragments. Measurements of the latter allow us to map out the average internuclear separation for every molecular photoionization sequence step and obtain the average time interval between the photoabsorption events. Using multiphoton ionization as a tool of multiple-pulse pump-probe scheme, we demonstrate the modification of the ionization dynamics as we vary the x-ray laser pulse duration.

9 pages, 4 figures

References in corpus (2)

• Double core hole production in N2: Beating the Auger clock
• Ultrafast absorption of intense x rays by nitrogen molecules

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• Carbon monoxide interacting with free-electron-laser pulses
• Nonlinearity in the sequential absorption of multiple photons
• Dissociating diatomic molecules in ultrafast and intense light
• Method of Kinetic Energy Reconstruction from Time-of-Flight Mass Spectra
• Revealing and controlling nuclear dynamics following inner-shell photoionization of N2