TY - JOUR
T1 - Measurements of excitation rate coefficients for Al-like ions
T2 - Fe xiv, Ni xvi, and Cu xvii
AU - Datla, R. U.
AU - Roberts, J. R.
AU - Durst, R. D.
AU - Hodge, W. L.
AU - Klepper, C. C.
AU - Rowan, W. L.
AU - Mann, J. B.
PY - 1987
Y1 - 1987
N2 - Absolute excitation rate coefficients for Fe xvi and Ni xvi ions ions are measured spectroscopically in the Texas Experimental Tokamak. Previous measurements for the 3d-3p transition array of Cu xvii are verified and the measurements are extended to the 3s3p23s23p transition array of this ion. The experimental rate coefficient for the 3d-3p transition array of Fe xiv is 6.2×10-9 cm3 s-1 at an electron temperature near 160 eV and for Ni xvi and Cu xvii, the values are 4.2×10-9 and 3.8×10-9 cm3 s-1, respectively, at an electron temperature near 240 eV. For the 3s3p2 2P3/23s23p 2P3/2 transition array, the experimental excitation rate coefficient for Fe xiv is 8.2×10-9 cm3 s-1 at an electron temperature near 160eV and for Ni xvi and Cu xvii the value is 5.5×10-9 cm3 s-1 at an electron temperature near 240 eV. The uncertainty in these results is estimated to be 50% (one standard deviation). Computed values of absolute excitation rates in a distorted-wave approximation and Mewe's semiempirical formula are found to be in good agreement with the experimental values.
AB - Absolute excitation rate coefficients for Fe xvi and Ni xvi ions ions are measured spectroscopically in the Texas Experimental Tokamak. Previous measurements for the 3d-3p transition array of Cu xvii are verified and the measurements are extended to the 3s3p23s23p transition array of this ion. The experimental rate coefficient for the 3d-3p transition array of Fe xiv is 6.2×10-9 cm3 s-1 at an electron temperature near 160 eV and for Ni xvi and Cu xvii, the values are 4.2×10-9 and 3.8×10-9 cm3 s-1, respectively, at an electron temperature near 240 eV. For the 3s3p2 2P3/23s23p 2P3/2 transition array, the experimental excitation rate coefficient for Fe xiv is 8.2×10-9 cm3 s-1 at an electron temperature near 160eV and for Ni xvi and Cu xvii the value is 5.5×10-9 cm3 s-1 at an electron temperature near 240 eV. The uncertainty in these results is estimated to be 50% (one standard deviation). Computed values of absolute excitation rates in a distorted-wave approximation and Mewe's semiempirical formula are found to be in good agreement with the experimental values.
UR - http://www.scopus.com/inward/record.url?scp=0040979255&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.36.5448
DO - 10.1103/PhysRevA.36.5448
M3 - Article
AN - SCOPUS:0040979255
SN - 1050-2947
VL - 36
SP - 5448
EP - 5450
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 11
ER -