J/A+AS/126/373 J/A+AS/126/373 IRON Project XXVII. Fe IV collision strengths H L Zhang A K Pradhan Astron. Astrophys. Suppl. Ser. 126 373 1997 1997A&AS..126..373Z 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 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 1997A&AS..126..365B : IRON Project XXVI. Fe IV oscillator strengths Atomic physics atomic processes HII regions planetary nebulae: general Collision strengths and maxwellian-averaged rate coefficients have been calculated for 8771 non-vanishing transitions among 140 fine structure levels, dominated by the configurations 3d^5^, 3d^4^4s, and 3d^4^4p in Fe IV. Collision strengths are calculated using the R-matrix method with a 49 term close-coupling target expansion for electron energies up to 15 rydbergs. Rate coefficients are tabulated for a wide range of temperatures in which Fe IV is abundant in plasma sources. A brief discussion of the calculations and sample results are given. The present rates for Fe IV are expected to find applications in spectral diagnostics of a variety of astrophysical sources.

Index Level index --- Conf Electronic configuration --- Term Electronic term --- J Total angular momentum --- E Theoretical energy Ry Patricia Bauer CDS 1997Sep12Honglin Zhang <zhang@astronomy.ohio-state.edu> J_A+AS_126_373.xml