Wavelength measurements of heliumlike 1s2s 3S1-1s2p 3P0,2 transitions in Ne8+, Na9+, Mg10+, and Si12+ emitted by solar flare plasmas

Details Wavelength measurements of heliumlike 1s2s 3S1-1s2p 3P0,2 transitions in Ne8+, Na9+, Mg10+, and Si12+ emitted by solar flare plasmas Wavelength measurements of heliumlike 1s2s 3S1-1s2p 3P0,2 transitions in Ne8+, Na9+, Mg10+, and Si12+ emitted by solar flare plasmas

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrva..62b2502c&link_type=abstract

Physical Review A (Atomic, Molecular, and Optical Physics), Volume 62, Issue 2, August 2000, id.022502

Physics

17

Visible And Ultraviolet Spectra, Atomic And Molecular Data, Spectra, And Spectral Parameters, Photometric, Polarimetric, And Spectroscopic Instrumentation, Solar Electromagnetic Emission

Scientific paper

With the Solar Ultraviolet Measurements of Emitted Radiation instrument-a high-resolution normal-incidence telescope and spectrometer on board the Solar and Heliospheric Observatory-heliumlike 1s2s 3S1-1s2p 3P0,2 transitions in the highly ionized species Ne8+, Na9+, Mg10+, and Si12+ were observed. The spectral lines were emitted by high-temperature solar flare plasmas. In this paper, we report on wavelength measurements of the He-like lines identified in the recorded spectra. The wavelength uncertainties we obtained from the solar measurements are <=20 mÅ(1σ), and in one case <=30 mÅ. This is comparable to or better than the best determinations so far achieved for these heliumlike 1s2s 3S1-1s2p 3P0,2 transitions with instrumentation in the laboratory. For the Na9+ 3S1-3P2 transition we report what is to our knowledge the first wavelength measurement. The knowledge of the accurate wavelengths can provide important checks on atomic structure calculations.

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