Ultraviolet solar identifications based on extended absorption series observed in the laboratory spectrum of SI I

Astronomy and Astrophysics – Astrophysics

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Absorption Spectra, Silicon, Solar Spectra, Ultraviolet Spectra, Chromosphere, High Resolution, Line Spectra, Rydberg Series, Solar Limb

Scientific paper

The absorption spectrum of Si I in the wavelength region between 1500 and 1900 A has been photographed at high resolution. The silicon vapor was produced in a 122-cm-long King furnace at 1800 to 2300 C. Forty-two Rydberg series have been observed from the ground state terms 3p(2)3P and 1D to terms associated with the 3pns and 3pnd configurations. All of the series from these configurations with J less than 4 have been extended with the 3pnd 3D(3) levels reaching n = 56. Numerous perturbations have been observed. This laboratory work has provided the basis for extending the identification of silicon lines in the solar spectrum. Nearly all lines found in the laboratory spectrum are also found in rocket spectrograms of the solar chromosphere. More than 300 lines have been attributed to Si I. The excellent correlation between laboratory and solar Si I lines is illustrated.

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