J/A+AS/131/499 J/A+AS/131/499 IRON Project XXIX. Boron isoelectronic sequence M E Galavis C Mendoza C J Zeippen Astron. Astrophys. Suppl. Ser. 131 499 1998 1998A&AS..131..499G J/A+AS/103/273 : IRON Project II. IR collision strengths of C-like ions J/A+A/283/319 : IRON Project III. B-like ions J/A+AS/108/1 : IRON Project V. Collision strengths of O-like ions J/A+A/293/953 : IRON Project VI. Fe II collision strengths J/A+A/293/967 : IRON Project VII. Fe II radiative transitions J/A+AS/109/193 : IRON Project VIII. Electron excitation of Ti-like ions J/A+AS/119/509 : IRON Project XVII. Radiative transition in Fe III J/A+AS/119/523 : IRON Project XVIII. Electron impact for Fe III J/A+AS/120/361 : IRON Project XIX. Fe II radiative transitions J/A+AS/123/159 : IRON Project XXII. C and O radiative rates J/A+AS/123/575 : IRON Project XXIII. Fe XXII excitation rate coefficients J/A+AS/126/373 : IRON Project XXVII. Fe IV collision strengths J/A+AS/131/153 : IRON Project XXXI. Fe XII electron excitation 1993A&A...279..298H : IRON Project I. Goal and methods 1994A&AS..107...29S : IRON Project IV. Electron excitation of F-like ions 1995A&AS..110..209P : IRON Project IX. Electron excitation of Cl-like ion 1995A&AS..111..347G : IRON Project X. Si- & S-like ions IR collision strengths 1996A&AS..115..151S : IRON Project XI. Ar VI, K VII and Ca VIII fine-structure 1995A&AS..114..367B : IRON Project XII. V-like ions electron excitation 1996A&AS..115..551B : IRON Project XIII. Ni II & Fe II electron excitation 1996A&A...309..677S : IRON Project XIV. Fe XIV fine-structure transition 1996A&AS..118..157K : IRON Project XV. Electron excitation of He II & Fe XXVI 1996A&AS..119..105B : IRON Project XVI. Fe V oscillator strengths 1997A&AS..122..167B : IRON Project XX. Fe I oscillator strengths 1997A&AS..122..177P : IRON Project XXI. Fe I fine-structure transition 1997A&AS..126..105B : IRON Project XXIV. Fe XXIV electron excitation 1998A&AS..127..545B : IRON Project XXV. Fe XII electron excitation 1997A&AS..126..365B : IRON Project XXVI. Fe IV oscillator strengths 1998A&AS..129..161B : IRON Project XXVIII. F-like ions fine-structure trans. Atomic physics atomic data atomic processes As part of the IRON Project, radiative rates have been calculated for the E1, E2 and M1 transitions within the n=2 complex in ions of the boron isoelectronic sequence (6<=Z<=28). The computations have been carried out with the atomic structure code SUPERSTRUCTURE which facilitates the generation of extended radiative datasets including configuration interaction, Breit-Pauli relativistic contributions and semi-empirical term-energy corrections. By means of extensive comparisons with the available datasets for this sequence, with detailed single-ion calculations and recent experiments, we have been able to assign accuracy ratings to the present A-values. We find that in general the spin-allowed and spin-forbidden E1 transitions are accurate to 10% and 20%, respectively, except for a few transitions in ions with Z<=7 that are perturbed by admixture with low-lying n=3 states (e.g. 2s^2^3l) and for those affected by the avoided crossing of the 2s2p^2^ ^2^S1/2 and ^2^P1/2 which takes place at Z~22. It is concluded that, statistically, the present dataset is the most accurate to date for this astrophysically relevant sequence.

Z Atomic number --- Ion Ion --- j j level --- i i level --- Aij Transition probability s-1 Patricia Bauer CDS 1998Aug13Martha Elena Galavis <mgalavis@pion.ivic.ve> J_A+AS_131_499.xml