The absorption spectrum of Ne I was observed photographically in the wavelength region of 565–595 Å with the high-resolution spectrograph at the Photon Factory in Japan. From the observed term values, the first ionization potentials I(2p<sup>5</sup> <sup>2</sup>P<sub>3/2</sub>) and I(2p<sup>5</sup> <sup>2</sup>P<sub>½</sub>) were found to be 173 930.0 ± 0.2 and 174 710.4 ± 0.2 cm<sup>−1</sup>, respectively. Furthermore, the five-channel quantum-defect theory is applied to the analysis of the present experimental term values. It is found that the multichannel quantum-defect theory describes well the absorption spectrum of Ne I observed in the present measurement.
© 1988 Optical Society of America
Kenji Ito, Kiyoshi Ueda, Takeshi Namioka, Kouichi Yoshino, and Yumio Morioka, "High-resolution absorption spectrum of Ne I in the region of 565–595 Å," J. Opt. Soc. Am. B 5, 2006-2014 (1988)