Negative ions as a probe to study the relaxation of clusters and molecules as a function of the excitation energy

The Journal of Chemical Physics

Bernard

et al. 2011

The fragmentation scheme of singly charged adenine molecule (H(5)C(5)N(5)(+)) has been studied via neutral fluorine impact at 3 keV. By analyzing in correlation the kinetic energy loss of the scattered projectile F(-) produced in single charge transfer process and the mass of the charged fragments, the excitation energy distribution of the parent adenine molecular ions has been determined for each of the main dissociation channels. Several fragmentation pathways unrevealed in standard mass spectra or in appearance energy measurements are investigated. Regarding the well-known hydrogen cyanide (HCN) loss sequence, we demonstrate that although the loss of a HCN is the dominant decay channel for the parent H(5)C(5)N(5)(+) (m = 135), the decay of the first daughter ion H(4)C(4)N(4)(+) (m = 108) involves not only the HNC (m = 27) loss but also the symmetric breakdown into two dimers of HCN.

Section: Introductionmentioning

confidence: 99%

Fragmentation of singly charged adenine induced by neutral fluorine beam impact at 3 keV

The Journal of Chemical Physics

Bernard

et al. 2011

“…To give a fundamental understanding of the process, a curvecrossing model in the frame work of Landau-Zener model was proposed by Mathur [2]. Several experimental studies on reaction window can be found in literature [3][4][5].…”

Section: Experimental Investigation Of the Reaction Window In Double mentioning

confidence: 99%

“…In this work, we study the fragmentation of FeTPPCl (C 44 H 28 N 4 FeCl, m=704) induced by F + and H + at 3 keV with the CIDEC (Collision Induced Dissociation under Energy Control) method [5][6][7]. The excitation energy (E * ) distribution of the parent ions (FeTPPCl 2+ ) as well as that of the individual fragmentation channels were experimentally determined.…”

Section: Experimental Investigation Of the Reaction Window In Double mentioning

confidence: 99%

Experimental investigation of the reaction window in double charge transfer process involving biomolecule target FeTPPCl

et al. 2012

J. Phys.: Conf. Ser.

Excitation and dissociation of tungsten hexacarbonyl W(CO)6: Statistical and nonstatistical dissociation processes

Martin

The Journal of Chemical Physics

et al. 2011

We have studied the excitation and dissociation processes of the molecule W(CO)(6) in collisions with low kinetic energy (3 keV) protons, monocharged fluorine, and chlorine ions using double charge transfer spectroscopy. By analyzing the kinetic energy loss of the projectile anions, we measured the excitation energy distribution of the produced transient dications W(CO)(6)(2+). By coincidence measurements between the anions and the stable or fragments of W(CO)(6)(2+), we determined the energy distribution for each dissociation channel. Based on the experimental data, the emission of the first CO was tentatively attributed to a nonstatistical direct dissociation process and the emission of the second or more CO ligands was attributed to the statistical dissociation processes. The dissociation energies for the successive breaking of the W-CO bond were estimated using a cascade model. The ratio between charge separation and evaporation (by the loss of CO(+) and CO, respectively) channels was estimated to be 6% in the case of Cl(+) impact.