Dissociation of multiply charged ICN by Coulomb explosion

Abstract

The fragmentations of iodine cyanide ions created with 2 to 8 positive charges by photoionization from inner shells with binding energies from 59 eV (I 4d) to ca. 900 eV (I 3p) have been examined by multi-electron and multi-ion coincidence spectroscopy with velocity map imaging ion capability. The charge distributions produced by hole formation in each shell are characterised and systematic effects of the number of charges and of initial charge localisation are found.

Coulomb explosion of CD3I induced by single photon deep inner-shell ionisation

“…The ion pairs form two islets, which is a consequence of the high momenta gained which result in sideways flying ions missing the detector. As evidenced by the figure, the charge build up model for these intermediate decay channels, n ∈ [1, 3] and m ∈ [3,6], matches well with the experiment whereas the instantaneous model overestimates the kinetic release energies, especially for the deuterium fragment. For a comprehensive reflection of all the resolvable decay channels, an islet separation plot is shown in Fig.…”

“…White [1]. Since then, 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 pumpprobe techniques involving ultraviolet (UV) [6], and by X-ray free electron laser (XFEL) ionisation utilising fewphoton absorption processes [7][8][9][10][11][12]. The dynamics of the charge rearrangement essential for the Coulomb explosion have previously been studied using time-resolved pump-probe techniques on molecular iodine [13,14] and in methyl iodide [15,16] where the results match well with a classical over-the-barrier model.…”

Fragmentation dynamics of doubly charged camphor molecule following C 1s Auger decay

“…[16][17][18] Momentum imaging and multiple ion coincidence detection techniques have revealed important aspects of these processes, such as the observation of a Renner-Teller state and multiple fragmentations in CO 2 , 19,20 inner-shell ionisation and fragmentation in intense X-ray pulses in methylselenol and ethylselenol, 13,18 details of fragmentation due to multiple charging of N 2 O by ion-impact collisions 21 and dissociation of multiply charged, inner-shell photoionised ICN. 22 In the structure of sufficiently large molecules, chirality is an additional feature in isomers, identical in all other respects except being mirror images of each other. Camphor, a naturally occurring molecule, has long served as the prototype to investigate photoexcitation 23 and dichroism in such systems.…”