CRITICALLY EVALUATED SPECTRAL DATA FOR NEUTRAL CARBON (C I)

Published

November 22, 2017

Author(s)

Haris Kunari, Alexander Kramida

Abstract

In this critical compilation, all known to us experimental data on the spectrum of neutral carbon were methodically evaluated and supplemented by parametric calculations with Cowan's code. The sources of experimental data vary from laboratory to astrophysical objects and employ different instrumentation from classical grating and Fourier transform spectrometers to precise laser spectroscopy setups and various other modern techniques. This comprehensive evaluation provides accurate atomic data on energy levels and wavelengths (observed and Ritz) with their estimated uncertainties, as well as a uniform description of observed line intensities. In total, 412 energy levels were optimized with the help of selected 1221 best observed lines participating in 1365 transitions in the wavelength region 750 Å to 609.14 µm. In addition, 737 possibly observable transitions are predicted. Critically evaluated transition probabilities for 1643 lines are provided, of which 268 are new. With the accurate energy levels obtained, combined with additional observed data on high Rydberg states, the ionization limit was determined to be 90 820.348(9) cm−1 or 11.2602880(11) eV in fair agreement with the previously recommended value, but more accurate.

Citation

Astrophysical Journal Supplement Series

Volume

233

Issue

1

Pub Type

Journals

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DOI Link

Keywords

Atomic spectroscopy, critical compilation, energy levels, spectral lines, line identification, Fourier-transform spectra, grating spectroscopy, Ritz standards, vacuum ultraviolet, transition probabilities, neutral carbon

Citation

Kunari, H. and Kramida, A. (2017), CRITICALLY EVALUATED SPECTRAL DATA FOR NEUTRAL CARBON (C I), Astrophysical Journal Supplement Series, [online], https://doi.org/10.3847/1538-4365/aa86ab (Accessed October 31, 2024)