Title :
Improved transition probabilities for Mn II
Author :
Kling, Rainer ; Greismann, U.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
Abstract :
Summary form only given. Accurate transition probabilities are of fundamental importance for plasma diagnostics. However the knowledge of atomic data is still unsatisfactory for many elements. Especially for Mn II experimental f-values, determined from arc and spark discharges, show big discrepancies with calculations. Therefore we started a new project for an independent measurement of transition probabilities. Fourier Transform spectroscopy has shown to be advantageous for the evaluation of complex spectra. The high resolution, limited by the Doppler width of the emission lines, helps avoiding blends whereas the simultaneous recording of all spectral contributions eliminates effects of source drifts. The signal-to-noise ratio for the strongest lines is in the order of 10000 which ensures a precise determination of line intensities. The efficiency of the instrument was calibrated using an argon miniarc and a tungsten strip lamp as radiance standards.
Keywords :
Fourier transform spectra; arcs (electric); manganese; oscillator strengths; plasma diagnostics; positive ions; radiative lifetimes; sparks; spectral line breadth; spectral line intensity; Ar miniarc; Fourier Transform spectroscopy; Mn; Mn II; Mn/sup +/; W strip lamp; arc discharges; atomic data; emission lines Doppler width; f-values; line intensities; plasma diagnostics; radiance standards; source drifts; spark discharges; transition probabilities; Argon; Atomic measurements; Fourier transforms; Instruments; Plasma diagnostics; Plasma measurements; Signal resolution; Signal to noise ratio; Sparks; Spectroscopy;
Conference_Titel :
Plasma Science, 1999. ICOPS '99. IEEE Conference Record - Abstracts. 1999 IEEE International Conference on
Conference_Location :
Monterey, CA, USA
Print_ISBN :
0-7803-5224-6
DOI :
10.1109/PLASMA.1999.829715
