Fragmentation dynamics of tetrachloromethane molecule induced by highly charged Ar-ion impact.

The ion impact multiple ionization and subsequent dissociation of CCl is studied using a beam of Ar ion having the energy of about 1 MeV in a linear time- of-flight mass spectrometer, coupled with a position-sensitive detector. The complete, as well as incomplete Coulomb explosion pathways, for CCl and CCl ions are identified and studied. The kinetic energy release distributions of channels, kinetic energies, and momentum distributions of fragmented ions, as well as neutrals, are also calculated.

Exploring three-body fragmentation of acetylene trication.

The three-body breakup of [CH] formed in collision with Xe moving at 0.5 atomic units of velocity is studied by using recoil ion momentum spectroscopy. Three-body breakup channels leading to (H, C, CH) and (H, H, C ) fragments are observed in the experiment and their kinetic energy release is measured.

Fragmentation dynamics of CHCl ( = 2,3): theory and experiment.

A combined theoretical and experimental study of the dissociation of the di- and trication of the CHCl molecule has been performed. Experimentally, these multi-charged ions were produced after interactions of a CHCl effusive jet with a mono-energetic beam of H or Ar projectile ions. Theoretically, we mapped the multi-dimensional potential energy surfaces of CHCl, HCClH and CHCl species in their electronic ground and electronically excited states using post-Hartree-Fock configuration interaction methods.

Hydrogen migration in triply charged acetylene.

We report on the direct experimental evidence of hydrogen migration in triply charged acetylene. The roaming hydrogen atom in a triply charged molecular ion is counter intuitive. The three body breakup channel CH →H+C+CH is studied using the technique of recoil ion momentum spectroscopy.

A new technique for measurement of subrotational lifetime of molecular ions.

Singly and multiply charged molecular ions are found in diverse environments and hold relevance for a wide range of research areas like combustion chemistry, accelerator physics, atmospheric sciences, plasma physics, astrophysics etc. Molecular dications are of special significance as they can be generated and studied comparatively easily in laboratory experiments. And they have enabled exploration of new and exciting phenomenon such as hydrogen migration, inter-atomic Coulombic decay, plasmonic excitations, orbital tomography etc.

Three-body dissociation of OCS: Separating sequential and concerted pathways.

Events from the sequential and concerted modes of the fragmentation of OCS that result in coincident detection of fragments C, O, and S have been separated using a newly proposed representation. An ion beam of 1.8 MeV Xe is used to make the triply charged molecular ion, with the fragments being detected by a recoil ion momentum spectrometer.

Study of K-line radiation of thick titanium produced in collisions of keV electrons.

The characteristic K-line yields Y(E₀) of a pure thick titanium (Z=22) element target are measured for 8-18 keV electron impact and compared with the simulation calculations using PENELOPE code. A fair agreement between experiment and simulation results is found within the existing experimental uncertainty of measurements. The ratio F of indirectly produced characteristic Ti K X-ray yield to its total (directly+indirectly) yield is determined by employing an approximate analytical formulation of Hanson and Cowan (Hanson, H.