Year: 2011
Type: article
Abstract: Collision strengths for the astrophysically important lines in N ii have been calculated in the close-coupling approximation using the B -spline Breit–Pauli R -matrix method. The multiconfiguration Hartree–Fock method with term-dependent non-orthogonal orbitals is employed for an accurate representation of the target wave functions. The close-coupling expansion includes 58 bound levels of N ii . The 58 target levels belong to the terms of the ground 2 s 2 2 p 2 and singly excited 2 s 2 p 3 , 2 s 2 2 p 3 s , 2 s 2 2 p 3 p , 2 s 2 2 p 3 d , 2 s 2 2 p 4 s , 2 s 2 2 p 4 p , and 2 s 2 p 2 3 s configurations. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities and these are tabulated for all 1653 fine-structure transitions among the 58 levels at electron temperatures in the range from 500 to 100,000 K. The line strengths, oscillator strengths, and transition probabilities for all E1 transitions are tabulated. The present results are compared with a variety of other close-coupling calculations. There is an overall good agreement with the 23-state calculation by Hudson & Bell in most part, but some significant differences are also noted for some transitions.
Author: S. S. Tayal
Institution: Clark Atlanta University
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: THE PRIMARY OBJECTIVE OF THE PROPOSED RESEARCH WORK IS TO PROVIDE LARGE SCALE ACCURATE RADIATIVE AND COLLISIONAL ATOMIC DATA FORTHOUSANDS OF LINES I, ELECTRON COLLISION RATES OF ATOMS AND IONS FOR APPLICATION TO ATMOSPHERES OF PLANETS AND THEIR SATELLITESTHE PRIMARY OBJECTIVE OF THE PROPOSED RESEA
OpenAlex ID: W2000770185