Effective collision strengths for optically allowed transitions among degenerate levels of hydrogenic ions with 2 ⩽ Z ⩽ 30

• Published in: Atomic data and nuclear data tables Vol. 96; no. 5; pp. 481 - 530
• Main Authors: Hamada, K., Aggarwal, K.M., Akita, K., Igarashi, A., Keenan, F.P., Nakazaki, S.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-09-2010
• Subjects: APPROXIMATIONS; ATOMIC AND MOLECULAR PHYSICS; BEAMS; BORN APPROXIMATION; CALCULATION METHODS; CHARGED PARTICLES; COLLISIONS; ELECTRON BEAMS; ENERGY-LEVEL TRANSITIONS; EXCITATION; FINE STRUCTURE; HYDROGEN IONS; ION COLLISIONS; IONS; LEPTON BEAMS; PARTICLE BEAMS; TEMPERATURE RANGE; TEMPERATURE RANGE OVER 4000 K
• ISSN: 0092-640X; 1090-2090
• DOI: 10.1016/j.adt.2010.02.001

The Coulomb–Born approximation is used to calculate electron-impact excitation collision strengths and effective collision strengths for optically allowed transitions among degenerate fine-structure levels of hydrogenic ions with
2
⩽
Z
⩽
30
and
n
⩽
5
. Collision strengths are calculated over a wide range of energies up to
E
j
/
Z
2
=
10
Ryd
. Effective collision strengths are obtained over a wide temperature range up to
10
8
K
by integrating the collision strengths over a Maxwellian distribution of electron velocities.