Electron-impact excitation of He-like ions: Mg XI

Journal Article · Sun Mar 01 04:00:00 EST 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.35.2073· OSTI ID:6835344

Tayal, S S

The collision strengths for the electron-impact excitation of inelastic transitions in Mg XI have been calculated by use of the R-matrix method. Eleven lowest LS target states 1s/sup 2/ /sup 1/S, 1s2s /sup 1,3/S, 1s2p /sup 1,3/P/sup 0/, 1s3s /sup 1,3/S, 1s3p /sup 1,3/P/sup 0/, and 1s3d /sup 1,3/D are included in the expansion of the total wave function. These target states are represented by accurate configuration-interaction wave functions. The lower partial-wave (Lless than or equal to8) results obtained in the R-matrix method are supplemented by higher partial waves obtained in the close coupling with exchange terms omitted (L = 9--15), Coulomb-Born (L = 16--36), and Coulomb-Bethe (L>36) approximations. Rydberg series of resonances converging to n = 2 and 3 thresholds are considered in the calculations. Results are obtained over a wide electron energy range (97.66--350.0 Ry) and are compared, where possible, with the previously available five-state Coulomb-exchange distorted-wave approximation results of Bednell. These collision strengths are then integrated with the assumption of a Maxwellian distribution of electron energies to obtain effective collision strengths for temperatures between 10/sup 5/ and 4 x 10/sup 7/ K.

• Research Organization: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001
• OSTI ID: 6835344
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 35:5; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
CHARGED PARTICLES
COLLISION INTEGRALS
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FUNCTIONS
INTEGRALS
ION COLLISIONS
IONS
MAGNESIUM IONS
MATRICES
MULTICHARGED IONS
R MATRIX
WAVE FUNCTIONS