Doppler tuning vuv spectroscopy of D{sup -} over an extended photon-energy range around the n=2 threshold
- Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark)
The giant (or shape) resonance in the photodetachment cross section of D{sup -} above the n=2 threshold has been subjected to high-resolution vacuum ultraviolet spectroscopy performed by Doppler tuning of ions stored in the ASTRID storage ring. In order to prevent changes in the overlap between laser and ion beams over the large kinetic-energy range employed in the experiment, a new ion-beam-positioning method based on a quadrupole-shunt technique was applied. The study presents an accurate measurement of parameters for the resonance, which is also denoted {sub 2}(0){sub 2}{sup +} {sup 1}P{sup o}. The resonance has a width of 26(2) meV while the asymmetry parameter q of the Fano profile is 3.2(0.4), which is at variance with the most recent theoretical calculations.
- OSTI ID:
- 21020851
- Journal Information:
- Physical Review. A, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevA.76.044701; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASTRID STORAGE RING
CROSS SECTIONS
DEUTERIUM IONS
DOPPLER EFFECT
ELECTRON DETACHMENT
ELECTRONS
FAR ULTRAVIOLET RADIATION
GIANT RESONANCE
ION BEAMS
KINETIC ENERGY
LASER RADIATION
PHOTOEMISSION
PHOTON BEAMS
PHOTONS
POLARIZATION
QUADRUPOLES
RESOLUTION
SPECTROSCOPY
SPIN
ULTRAVIOLET SPECTRA