Abstract

The Ne i resonance line λ743 has been accurately measured in the fifth order of the NBS 10.7-m vacuum spectrograph against Ar ii Ritz standards in the same order; the measured wavelength is 743.71955±0.0002 Å. This gives for the lowest excited level, 2p5(P2112°)3s[112]2° (1s5 in Paschen’s notation), the value 134 041.84±0.04 cm−1 relative to the ground level. This result was used to calculate all of the observed 2p5nl levels relative to the ground level, by use of Ne i observations published during the last two decades and the dispersion formula for air adopted after the publication of Atomic Energy Levels (NBS 1949). The 2p5P2112° ionization energy is 173 929.75±0.06 cm−1. From the level system, 46 lines in the vacuum ultraviolet (vuv) between 743 and 576 Å have been calculated according to the combination principle; these should be accurate to ±0.0002 Å or better between 743 and 580 Å and to about ±0.0003 Å for the few lines below 580 Å.

© 1972 Optical Society of America

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