Abstract
L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CD3I, irradiated with hard X-rays has been examined by a time-of-flight multi-ion coincidence technique. The core vacancies relax efficiently by Auger cascades, leading to charge states up to 16+. The dynamics of the Coulomb explosion process are investigated by calculating the ions’ flight times numerically based on a geometric model of the experimental apparatus, for comparison with the experimental data. A parametric model of the explosion, previously introduced for multi-photon induced Coulomb explosion, is applied in numerical simulations, giving good agreement with the experimental results for medium charge states. Deviations for higher charges suggest the need to include nuclear motion in a putatively more complete model. Detection efficiency corrections from the simulations are used to determine the true distributions of molecular charge states produced by initial L1, L2 and L3 ionisation.
Highlights
L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CD3I, irradiated with hard X-rays has been examined by a time-of-flight multi-ion coincidence technique
Coulomb explosions have been studied in many different ways, for instance, by photoion-photoion coincidence spectroscopy in the vacuum ultraviolet (VUV) and soft X-ray region[2,3,4], by coincidence imaging[5], by time-resolved pump-probe techniques involving ultraviolet (UV)[6], and by X-ray free electron laser (XFEL) ionisation utilising few-photon absorption processes[7,8,9,10,11,12]
We explore a two-parameter model recently introduced by Motomura et al.[9], who studied Coulomb explosion of CH3I from ionisation induced by the absorption of several X-ray photons within a pulse duration of ~10 fs
Summary
L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CD3I, irradiated with hard X-rays has been examined by a time-of-flight multi-ion coincidence technique. The parameters are determined by comparing the experimental and numerical time-of-flight distributions from triple coincidence detections from different fragmentation channels D+ + Cn+ + Im+.
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