Transition probabilities of Cr(I) and Cr(II) lines lying between 422 and 485 nm,using emission measurements from a wall stabilized arc |
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Authors: | T Wujec S Weniger |
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Institution: | Observatoire de Paris-Meudon, 92190 Meudon, France |
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Abstract: | The arc emission method has been employed to measure transition probabilities for two hundred and seventy five lines of Cr(I) (of which thirty-five are blended) and for twenty-six lines of Cr(II) lying between 422 and 484 nm. The spectra were photographed by means of a large grating spectrograph. Plasma diagnostics were carefully performed to obtain accurate values of temperatures.The absolute scale was established for Cr(I) lines using precisely known Amn-values derived from life-time measurements for the resonance lines; for the Cr(II) lines, our absolute scale is based on accurate measurements for the line at 4242.56 Å. The smallest and largest errors estimated for the Amn-values are ±10% and ±40%. There is generally good agreement with previous experimental data, although our values sometimes deviate by factor of 2–3 from the calculated estimates. |
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