The electron-impact multiple ionization and subsequent dissociation of CO${}_{2}$ is studied for 12-keV electron energy using a linear time-of-flight mass spectrometer coupled with multihit, position-sensitive detector. complete as well incomplete Coulomb explosion pathways CO${}_{2}$${}^{2+}$ CO${}_{2}$${}^{3+}$ ions are examined identified. kinetic release distributions these precursor obtained. experimental values the fragmentation channels found to be overestimated by those calculated...

Events from the sequential and concerted modes of fragmentation OCS3+ that result in coincident detection fragments C+, O+, S+ have been separated using a newly proposed representation. An ion beam 1.8 MeV Xe9+ is used to make triply charged molecular ion, with being detected by recoil momentum spectrometer. By separating events belonging exclusively mode breakup, electronic states intermediate (CO2+ or CS2+) involved are determined, kinetic energy release spectra, it shown low lying excited...

The dissociative ionization of a N${}_{2}$O molecule is studied at an electron energy 10 keV using the multiple-ion-coincidence imaging technique. complete as well incomplete Coulomb explosion pathways for N${}_{2}$O${}^{2+}$ and N${}_{2}$O${}^{3+}$ ions are examined identified. precursor-specific relative partial cross sections resulting fragment obtained. It found that about 81.8$%$ single ionization, 17.8$%$ double 0.4$%$ triple parent contribute to total ion yield. Furthermore, ionic...

The dissociation of ${\mathrm{NH}}_{3}$ is studied using energetic $\mathrm{H}{}^{+}$ and ${\mathrm{Ar}}^{q+}$ ($q=1,8$) ions. multi-ion coincidence technique along with the time- position-sensitive measurements recoil ions allows us to distinguish different channels involving rearrangement hydrogen atoms. It observed that bond ${\mathrm{NH}}_{3}{}^{x+}$ ($x=3--5$) occurs in a concerted manner nonplanar exists. Our results indicate competition between bond-rearrangement Coulomb repulsion...

The kinematics and dissociation dynamics of a H2O molecule induced by 10 keV electrons are studied using time-of-flight mass spectrometer in conjunction with position-sensitive detector multi-hit coincidence mode. Five dissociative channels arising from the complete as well incomplete Coulomb explosions H2Oq+ (q = 2, 3) ions observed identified. mechanisms (concerted and/or sequential) for these examined. Further, angular correlation different fragment geometrical structure precursor ion...

The scientific enterprise in India has grown dramatically the past few decades, with research emerging as a viable and important career option for students of science.The country thus large population young scientists early stages establishing their independent careers.While this demographic is arguably most group that will determine future India, status concerns are poorly understood.The Indian National Young Academy Sciences conducted national survey to better understand present challenges...

We describe a new experimental setup for studying the fragmentation dynamics of molecules induced by impact keV electrons using well-known technique recoil ion momentum spectroscopy. The apparatus consists mainly time- and position-sensitive multi-hit particle detector analysis channel electron multiplier detecting ejected electrons. Different components relevant electronics data acquisition are described in detail with their working principles. In order to verify reliable performance setup,...

The ionic fragmentation of a multiply charged CO molecule is studied under impact 10-keV electrons using recoil-ion momentum spectroscopy. kinetic-energy-release distributions for the various channels arising from dissociation CO${}^{q+}$ ($q$ = 2--4) are measured and discussed in light theoretical calculations available literature. It observed that present values much smaller than those predicted by Coulomb explosion model. distribution C${}^{+}$+O${}^{+}$ channel suggested to arise...

Experimental data on total- and partial-ionization cross sections of ionic fragments ${\mathrm{CO}}_{2}$ molecule produced by impact 10--26-keV electrons are obtained a crossed-beam apparatus in our laboratory. An ejected electron-produced ion-coincidence technique is employed together with time-of-flight mass spectrometer for analysis the ions. The six fragments, ${\mathrm{CO}}_{2}{}^{+}$, ${\mathrm{CO}}^{+}$, ${\mathrm{CO}}_{2}{}^{2+}$, ${\mathrm{O}}^{+}$, ${\mathrm{C}}^{+}$,...

The dissociative ionization of a CO${}_{2}$ molecule is studied at an electron energy 12 keV using the multiple ion coincidence imaging technique. absolute partial cross sections and precursor-specific resulting fragment ions are obtained reported. It found that \ensuremath{\sim}75% single ionization, 22% double \ensuremath{\sim}2% triple parent contribute to total yield; quadruple make negligibly small contribution. Furthermore, for ion-pair ion-triple formation measured nine channels up...

The dynamics of ionic fragmentation CH${}_{4}$ molecules under impact 10-keV electrons has been studied. technique recoil ion momentum spectroscopy is employed to obtain information about the kinetic energy release and dissociation mechanisms different pathways arising from a dication. results show that there are altogether eight arise complete incomplete Coulomb explosions CH${}_{4}$${}^{2+}$ molecular ions. for these compared with earlier data literature charged particles, photons, their...

We report on the direct experimental evidence of hydrogen migration in triply charged acetylene. The roaming atom a molecular ion is counter intuitive. three body breakup channel C2H23+→H++C++CH+ studied using technique recoil momentum spectroscopy. was generated collisions neutral parent with slow highly Xe9+ ion. Three different dissociation pathways have been identified and separated, namely, concerted an acetylene configuration, vinylidene sequential via [C2H]2+ intermediate, branching...

The relative partial ionization cross sections for the fragment ions produced in direct and dissociative of a N${}_{2}$O molecule are measured impact 10--25-keV electrons by using an electron-ion-coincidence technique with linear time-of-flight spectrometer. six ionic fragments (N${}_{2}$O${}^{+}$, NO${}^{+}$, N${}_{2}$${}^{+}$, O${}^{+}$, N${}^{+}$, N${}^{2+}$ $+$ O${}^{2+}$) observed identified. energy dependence these is expressed to section N${}_{2}$O${}^{+}$ found be nearly invariant....

Introduction: COVID 19 often presents with flu-like symptoms. Elderly patients systemic comorbidities are more likely to have severe infections and deaths. Severe neurological complications frequently reported in severely critically ill patients. In COVID-19, both central peripheral nervous systems can be affected. The study aims overview the spectrum, characteristics, outcomes of neurologic manifestations associated acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Methods: A total...

The three-body breakup of [C2H2]3+ formed in collision with Xe9+ moving at 0.5 atomic units velocity is studied by using recoil ion momentum spectroscopy. Three-body channels leading to (H+, C+, CH+) and H+, C2+) fragments are observed the experiment their kinetic energy release measured. into occurs via concerted sequential modes, whereas shows only mode. By collecting events coming exclusively from CH+), we have determined for unimolecular fragmentation molecular intermediate, [C2H]2+. ab...

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

The interaction of fast protons (velocity between 1.41 and 2.4 a.u.) with naphthalene azulene is investigated as a model an ion-polycyclic aromatic hydrocarbon system. Production various intact fragment ions in coincidence electron emission, transfer to projectile, or both analyzed. two targets being isomers, the rather obvious similarity fundamental ion-molecule collision energetics quantitatively verified. isomerization processes cationic are observed be influencing its further...

Delayed dissociation of doubly ionized ethylene, produced by collisions highly charged ions, was studied at low and medium collision energies. Position-sensitive time-of-flight measurements all the recoil fragments, triggered detection a charge-selected scattered ion, or emitted electrons, allowed us to identify ionic processes accompanied delayed processes. We found that are well described power-law decay, rather than exponential decay.