On the validity of the ICFT R-matrix method: Fe xiv | Zendy

G. Del Zanna | Zendy; N. R. Badnell | Zendy; L. Fernández-Menchero | Zendy; G. Y. Liang | Zendy; H. E. Mason | Zendy; P. J. Storey | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

On the validity of the ICFT R-matrix method: Fe xiv

Author(s) -

G. Del Zanna,

N. R. Badnell,

L. Fernández-Menchero,

G. Y. Liang,

H. E. Mason,

P. J. Storey

Publication year - 2015

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/stv2016

Subject(s) - physics , dirac (video compression format) , matrix (chemical analysis) , collision , coupling (piping) , transformation (genetics) , r matrix , atomic physics , quantum mechanics , mechanical engineering , biochemistry , chemistry , materials science , computer security , computer science , neutrino , composite material , gene , engineering

Recently, Aggarwal & Keenan published a Dirac R-matrix (darc) calculation for the electron-impact excitation of Fe xiv. A 136-level configuration-interaction/close-coupling (CI/CC) expansion was adopted. Comparisons with earlier calculations, obtained by Liang et al. with the intermediate coupling frame transformation (ICFT) R-matrix method, showed significant discrepancies. One of the main differences was that the Liang et al. effective collision strengths were consistently larger. Aggarwal & Keenan suggested various possible causes for the differences. We discuss them in detail here. We have carried out an ICFT R-matrix calculation with the same 136-level CI/CC expansion adopted by Aggarwal & Keenan, and compared the results with theirs and with those of Liang et al., which employed a much larger CI/CC expansion. We find that the main differences arise because of the different CC and CI expansions, and not because of the use of the ICFT method, as suggested by Aggarwal & Keenan. The significant increase in the effective collision strengths obtained by Liang et al. is mainly due to the extra resonances that are present because of the larger target expansion

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research