Direct potential and temperature effects on the MgHe line-core and far-wing photoabsorption profiles
- Physics Department, Badji Mokhtar University, B.P. 12, Annaba 23000 (Algeria)
- Laboratoire de Physique des Rayonnements, Badji Mokhtar University, B.P. 12, Annaba 23000 (Algeria)
The present study deals with the collisional broadening of monatomic magnesium, evolving in a helium buffer gas, in the wavelength and temperature ranges 260-310 nm and 100-3000 K, respectively. The computed emission and absorption spectral profiles are based on the most recent potential-energy curves and transition dipole moments. The required interatomic Mg(3s{sup 2})+He(1s{sup 2}) and Mg(3s3p)+He(1s{sup 2}) potentials are constructed from two different sets. The purpose of this treatment is twofold. First, using the quantum-mechanical Baranger impact approximation, the width and shift of the line-core spectra are determined and their variation law with temperature is examined. Then, the satellite structures in the blue and red wings are analyzed quantum mechanically. The calculations show especially that the free-free transitions contribute most to the MgHe photoabsorption spectra and that a satellite structure is observable beyond the temperature 1800 K around the wavelengths 272 or 276 nm, depending on the used potential set. Weak satellites have also been investigated and, for all cases, the obtained results showed good agreement with those already published.
- OSTI ID:
- 21541297
- Journal Information:
- Physical Review. A, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevA.83.032719; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION SPECTRA
APPROXIMATIONS
DIAGRAMS
DIPOLE MOMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
HELIUM
LINE WIDTHS
MAGNESIUM
POTENTIAL ENERGY
QUANTUM MECHANICS
TEMPERATURE RANGE
VARIATIONS
WAVELENGTHS
ALKALINE EARTH METALS
CALCULATION METHODS
ELEMENTS
ENERGY
FLUIDS
GASES
INFORMATION
MECHANICS
METALS
NONMETALS
RARE GASES
SPECTRA