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Exploring high-energy doubly excited states of NH by dissociative recombination of NH+
- Source :
- Journal of Physics B: Atomic, Molecular and Optical Physics
- Publication Year :
- 2014
-
Abstract
- We have investigated electron capture by NH+ resulting in dissociative recombination (DR). The impact energies studied of ~4–12 eV extend over the range below the two lowest predicted NH+ dissociative states in the Franck–Condon (FC) region of the ion. Our focus has been on the final state populations of the resulting N and H atoms. The neutral DR fragments are detected downstream of a merged electron and ion beam interaction zone in the TSR storage ring, which is located at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. Transverse fragment distances were measured on a recently developed high count-rate imaging detector. The distance distributions enabled a detailed tracking of the final state populations as a function of the electron collision energy. These can be correlated with doubly excited neutral states in the FC region of the ion. At low electron energy of ~5 eV, the atomic product final levels are nitrogen Rydberg states together with ground-state hydrogen. In a small electron energy interval near 7 eV, a significant part of the final state population forms hydrogen Rydberg atoms with nitrogen atoms in the first excited (2D) term, showing the effect of Rydberg doubly excited states below the predicted 2 2Π ionic potential. The distance distributions above ~10 eV are compatible with nitrogen Rydberg states correlating to the doubly excited Rydberg state manifold below the ionic 2 4 Σ − level.
- Subjects :
- Physics
Range (particle radiation)
High energy
Hydrogen
Electron capture
chemistry.chemical_element
Quantendynamik - Abteilung Blaum
Condensed Matter Physics
Nitrogen
Molecular physics
Atomic and Molecular Physics, and Optics
chemistry
Excited state
Physics::Atomic Physics
Atomic physics
Dissociative recombination
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Journal of Physics B: Atomic, Molecular and Optical Physics
- Accession number :
- edsair.doi.dedup.....c31048330abb3a57288f8043803fa2d9