Setup for measuring angular anisotropies in slow ion-molecule collisions

Phys. Chem. Chem. Phys.

Maiyelvaganan

Prakash

et al. 2022

Section: Methodsmentioning

confidence: 99%

Fragmentation dynamics of CH₃Cl^q+ (q = 2,3): theory and experiment

Phys. Chem. Chem. Phys.

Maiyelvaganan

Prakash

et al. 2022

“…The details of the experimental setup can be found in (Kumar et al 2014). Briefly, the experiments are carried out at the Electron Cyclotron Resonance (ECR) based low energy ion beam facility at Inter University Accelerator Centre, New Delhi.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…By knowing the TOF and (x,y) position of the recoil ions, the momentum components along the three axes can be obtained (Kumar et al 2014). The momentum resolutions along the x (ion beam direction), y (gas jet direction) and z (TOF) directions are 49 au, 32 au and 34 au, respectively (Kumar et al 2014). 1 au of momentum corresponds to 1.992 × 10 −24 kg m s −1 .…”

Section: Experimental Methodsmentioning

confidence: 99%

H-atom rearrangement in NH3 under ion impact

Proc.Indian Natl. Sci. Acad.

Sairam

Safvan

2021

Self Cite

The rearrangement of H-atoms is studied in the interaction of energetic (50-2000 keV) H + and Ar q+ (q = 1, 8) ions with NH 3 . The technique of recoil ion momentum spectrometry is used to obtain various dissociation channels involved in these collision events. The variation of the relative yields of the H 2 + and H 3 + ions is obtained as a function of the interaction strength q/v, where q and v are the charge state and velocity of the projectile. It is observed that the yield of H 2 + increases with q/v of the projectile, however, H 3 + is observed only at the highest q/v.

“…The experiment was conducted at the Low Energy Ion Beam Facility (LEIBF) of Inter-University Accelerator Centre, New Delhi. Projectile ions of Xe 9+ , produced in an electron cyclotron resonance ion source placed on a high voltage deck, accelerated to an energy of 450 keV were made to interact with neutral SO 2 molecules (effusing from a hypodermic needle) under single collision conditions 29 . The recoil ions generated from this interaction were extracted into a time-of-flight mass spectrometer using an electric field of 50 V/mm while the electrons are extracted in the opposite direction.…”

Section: Methodsmentioning

confidence: 99%

A new technique for measurement of subrotational lifetime of molecular ions

Rajput

Kumar

et al. 2020

Sci Rep

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. The lifetime of a molecular dication is one of its fundamental characteristics, whose measurement contributes to strengthening ab initio calculations and in predicting the concentration of its dissociation products. Most of the already reported lifetimes of molecular dications are in the range of nanoseconds to seconds and metastable states with lifetimes of the order of picoseconds have only been theoretical predicted and an experimental verification is pending. We present a method of measuring subrotational lifetimes of molecular dications formed in three-body sequential breakup of polyatomic molecular precursors. Specifically, we have measured the subrotational lifetime of $$\hbox {SO}^{2+}$$ SO 2 + , which is formed as an intermediate in the three-body sequential fragmentation of $$\hbox {SO}_2^{3+}$$ SO 2 3 + . The lifetime against dissociation is determined to be a fraction of the rotational period of $$\hbox {SO}^{2+}$$ SO 2 + and is of the order of few picoseconds. The method proposed is general and is not restricted to triatomic precursors.