Effective Collision Strengths for Electron Impact Excitation of N I

✍ Scribed by S.S. Tayal

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 87 KB
• Volume: 76
• Category: Article
• ISSN: 0092-640X
• DOI: 10.1006/adnd.2000.0842

✦ Synopsis

We have calculated electron collisional excitation strengths for transitions among the 18 LS states 2s 2 2 p 3 4 S o , 2 D o , 2 P o ; 2s 2 2p 2 ( 3 P)3s 4 P, 2 P; 2s2p 4 4 P; 2s 2 2p 2 ( 3 P)3 p 2 S o , 4 D o , 4 P o , 4 S o , 2 D o , 2 P o ; 2s 2 2 p 2 ( 1 D)3s 2 D; 2s 2 2p 2 ( 3 P)4s 4 P, 2 P; and 2s 2 2 p 2 ( 3 P)3d 2 P, 4 P, 2 D of N I using the R-matrix method. These states are represented by fairly extensive configuration-interaction wave functions. The 18 LS states give rise to 40 fine-structure levels. The calculated excitation energies agree well with the measured values. The collision strengths for fine-structure transitions are obtained using an algebraic transformation to intermediate coupling. The collision strengths are integrated over a Maxwellian distribution of electron energies to obtain effective collision strengths over a wide temperature range from 1000 to 600,000 K. The effective collision strengths obtained are tabulated for transitions among the lowest 12 LS states.