Na I spectra in the 1.4–14 micron range: transitions and oscillator strengths involving f-, g-, and h-states

0377384 - ÚFCH JH 2013 RIV FR eng J - Journal Article
Civiš, Svatopluk - Ferus, Martin - Kubelík, Petr - Jelínek, Petr - Chernov, V. E. - Zanozina, E. M.
Na I spectra in the 1.4–14 micron range: transitions and oscillator strengths involving f-, g-, and h-states.
Astronomy & Astrophysics. Roč. 542, June 2012 (2012), A35. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA AV ČR IAA400400705
Grant - others:GA MF(CZ) ECPF:049/4V
Institutional support: RVO:61388955
Keywords : atomic data * line: identification * techniques: spectroscopic
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 5.084, year: 2012

Context. Compared with the visible and ultraviolet ranges, fewer atomic and ionic lines are available in the infrared spectral region. Atlases of stellar spectra often provide only a short list of identified lines, and modern laboratory-based spectral features for wavelengths longer than 1 micron are not available for most elements. For the efficient use of the growing capabilities of infrared (IR) astronomy, detailed spectroscopical information on atomic line features in the IR region is needed. Aims. Parts of the infrared stellar (e.g., solar) spectra in the 1200–1800 cm-1 (5.6–8 μm) range have never been observed from the ground because of heavy contamination of the spectrum by telluric absorption lines. Such an infrared spectrum represents a great challenge for laboratory observations of new, unknown infrared atomic transitions involving the atomic levels with high orbital momentum and their comparison with the available spectra. Methods. The vapors of excited Na i atoms are produced during the ablation of the salt (sodium iodide, Na i) targets by a high-repetition rate (1.0 kHz) pulsed nanosecond ArF laser ExciStar S-Industrial V2.0 1000, pulse length 12 ns, λ = 193 nm, output energy of 15 mJ, fluence about 2–20 J/cm2 inside a vacuum chamber (average pressure 10-2 Torr). The time-resolved emission spectrum of the neutral atomic potassium (Na i) was recorded in the 700–7000 cm-1 region using the Fourier transform infrared spectroscopy technique with a resolution of 0.02 cm-1. The f-values calculated in the quantum-defect theory approximation are presented for the transitions involving the reported Na i levels.
Permanent Link: http://hdl.handle.net/11104/0209553