Velocity dependence of electron-capture partial cross sections and alignment in low-energy collisions of Ne8+ and Ar8+ with atomic Na

verfasst von: David M. Gauntt, Karsten Danzmann
Abstract: We have measured the intensities and polarizations of fine-structure lines in the N=9-8 manifolds of Ne viii and Ar viii spectra produced in collisions of Ne8+ and Ar8+ (v=0.05-0.15 a.u.) with atomic sodium, and determined alignment and partial cross sections for electron capture as functions of projectile velocity. At low velocity the partial cross section for capture into the S levels is significantly higher than for capture into higher L levels, and at higher velocities the higher-L partial cross sections increase for Ar viii and dominate for Ne viii. The low-L-level cross sections are in fair agreement with multichannel-Landau-Zener calculations, while the high-L-level cross sections are in qualitative disagreement. For the neon projectiles, the polarization of the Bohr line is approximately 0.3 and independent of velocity; for argon projectiles, the polarization is approximately 0.15 and increases with increasing velocity. A qualitative theoretical interpretation is offered.
Externe Organisation(en): Stanford University
Typ: Artikel
Journal: Physical Review A
Band: 46
Seiten: 5580-5593
Anzahl der Seiten: 14
ISSN: 1050-2947
Publikationsdatum: 11.1992
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Atom- und Molekularphysik sowie Optik
Elektronische Version(en): http://hdl.handle.net/11858/00-001M-0000-0013-5C78-D (Zugang: Offen)
https://doi.org/10.1103/PhysRevA.46.5580 (Zugang: Geschlossen)

BibTeX

@article{3820d18d19a34940ba2be5a25b655248,
title = "Velocity dependence of electron-capture partial cross sections and alignment in low-energy collisions of Ne8+ and Ar8+ with atomic Na",
abstract = "We have measured the intensities and polarizations of fine-structure lines in the N=9-8 manifolds of Ne viii and Ar viii spectra produced in collisions of Ne8+ and Ar8+ (v=0.05-0.15 a.u.) with atomic sodium, and determined alignment and partial cross sections for electron capture as functions of projectile velocity. At low velocity the partial cross section for capture into the S levels is significantly higher than for capture into higher L levels, and at higher velocities the higher-L partial cross sections increase for Ar viii and dominate for Ne viii. The low-L-level cross sections are in fair agreement with multichannel-Landau-Zener calculations, while the high-L-level cross sections are in qualitative disagreement. For the neon projectiles, the polarization of the Bohr line is approximately 0.3 and independent of velocity; for argon projectiles, the polarization is approximately 0.15 and increases with increasing velocity. A qualitative theoretical interpretation is offered.",
author = "Gauntt, {David M.} and Karsten Danzmann",
year = "1992",
month = nov,
doi = "10.1103/PhysRevA.46.5580",
language = "English",
volume = "46",
pages = "5580--5593",
journal = "Physical Review A",
issn = "1050-2947",
publisher = "American Physical Society",
number = "9",
}