Fast ion-induced CO molecule fragmentation in the strong interaction regime

Abstract

A coincident time of flight technique is used to investigate fast ion-induced CO molecule fragmentation with swift and multicharged heavy ions. The results concern the strong interaction regime for which no data have yet been reported. Kinetic energy release distributions, branching ratios and multi-electron removal cross sections are determined for each dissociation channel of ions (Q = 2-9). The general trend, from the perturbative regime to the strong interaction regime, is analysed in the light of recent ion-atom advances. The use of recoil ion momentum spectroscopy to study one dissociative single ionization channel - with simultaneous excitation - greatly improves the experimental KER resolution. Furthermore, it allows a coincident measurement of the angular and kinetic energy release distributions. This technique is proved promising for molecular spectroscopy studies.

Measurement of kinetic energy release in CO fragmentation by charge-changing collisions of fast heavy ions

“…Note that a simple sum of the ionization potentials required for these ionized states shows 49.3 and 59.9 eV for (C 2+ , O + ) and (C + , O 2+ ), respectively. Table I also presents other experimental TOF data obtained by pulsed-beam coincidence methods in which individual charge-changing processes are not distinguished [1,11]. Their data of both production cross sections and branching ratios are in good agreement with each other irrespective of largely different incident species, velocities, and charges.…”

“…In the last few decades collision-induced molecular fragmentation was extensively studied for various combinations between projectile particles and molecules [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The investigation was carried out for the identification of fragment-ion pairs, kinetic energies of the fragments, and the orientation effect on the molecular fragmentation.…”

“…The investigation was carried out for the identification of fragment-ion pairs, kinetic energies of the fragments, and the orientation effect on the molecular fragmentation. It is noted that experimental data of high quality can be obtained recently owing to the improvement of three-dimensional momentum imaging techniques [18,19], where the momenta of individual fragment ions are measured three-dimensionally [3][4][5][6][7][8][11][12][13][14][15]. The molecular fragmentation occurs from dissociative excited states of an intact molecule that is mostly ionized to some degree in the case of ion impact.…”

Potential energy curves for neutral and multiply charged carbon monoxide

“…However, so many facts on the system remain unexplained due to the lack of accurate potential energy curves (PECs) of multiply charged CO. Experimental and theoretical results available on multiply charged ions have been reviewed elsewhere [9,10]. Although both mono and dications of CO have been investigated extensively [11][12][13][14][15][16][17][18], very few theoretical results are available on trication [19,20].…”

Kinetic-energy release inN2fragmentation by charge-changing collisions of2-MeVMizuno1, Yamada2, Tsuchida3 et al. 2010Phys. Rev. A7050View full textAdd to dashboardCite

“…In recent investigations three-dimensional momentum imaging techniques were used to determine molecular orientation [2][3][4][5][6] and kinetic-energy release (KER) during fragmentation [7][8][9][10][11][12][13]. As the molecular fragmentation occurs predominantly from a dissociative excited state, it is important to measure KER in individual fragmentation channels because it carries direct information about the initial dissociative excited states [8,14].…”