Semiclassical Description of Radiative Processes Involving Heteronuclear Molecular and Quasimolecular Rare Gas Ions

Heteronuclear diatomic rare gas molecular cations feature excited electronic terms with charge transfer character located several eV above the ground term. The role of such terms in collisions involving heteronuclear ions is studied theoretically under conditions typical of the plasma-based sources of UV and IR radiation. Calculations were carried out for processes of dissociative excitation, dissociative recombination and electron impact bound–bound excitation in Ar/Xe and Kr/Xe plasmas using the recently developed semiclassical approach combined with the ab initio data for potential energy curves and oscillator strengths of electronic transitions. The approach consistently describes the contributions from the entire rovibrational manifold to the processes studied. The cross sections of the processes mentioned are calculated for wide ranges of gas temperatures and electron energies. We show that the processes considered are quite effective when they are accompanied by transitions to charge transfer terms. For the range of electron energies typical of active media of UV and IR radiation sources the cross sections exceed those reported for the processes usually considered to involve transitions between the ground and first excited electronic state. The excitation of charge transfer electronic terms can play an important role in the kinetics of rare gas mixture plasmas.

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Charge Transfer Excitation of NeAr+ Ions in Collisions with Electrons

Narits,

Kislov,

Lebedev

2024

Atoms

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We study the resonant processes of the excitation of weakly bound NeAr+ ions in collisions with the free electrons of Ne/Ar mixture plasma under conditions typical of the active media of gas lasers and plasma-based UV radiation sources. The transitions leading to the population of charge transfer electronic terms are considered. Using an original theoretical approach developed recently, we study the dependences of the cross-sections of several competing resonant processes on the incident electron energy and the gas temperature of the plasma. The role of the continuous states of internuclear motion is discussed. We highlight the specific features of the processes considered that stem from the low binding energy of NeAr+ ions and demonstrate that, in the weakly bound systems, the efficiencies of different charge transfer excitation channels differ greatly from those obtained for ions with moderate dissociation energies.

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Semiclassical Description of Radiative Processes Involving Heteronuclear Molecular and Quasimolecular Rare Gas Ions

Cited by 3 publications

References 32 publications

Photoabsorption and Electron-Impact Dissociation of ArXe+ and KrXe+ Molecular Ions

Photoabsorption and Electron-Impact Dissociation of ArXe+ and KrXe+ Molecular Ions

Electron-Impact Excitation and Dissociation of Heavy Rare Gas Heteronuclear Ions via Transitions to Charge Transfer States

Charge Transfer Excitation of NeAr+ Ions in Collisions with Electrons

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