作者: C. M. Brown , S. G. Tilford , M. L. Ginter
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摘要: The absorption spectra of Ca I in the wavelength ranges ∾ 1550–1770 A and 2020–2090 have been photographed third order a 6.6-m spectrograph. Calcium vapor was produced by heating calcium metal an evacuable King-furnace system with hot zone 122 cm long. 4s21S0–4s n p1P1° series has extended to = 79, which corresponds 46 new 4s np1P1° levels leads improved value for ionization potential i. More than 230 doubly excited observed vacuum region, over 140 correspond levels. All but five these can be arranged into six series, interact strongly each other, continua above 4s2S1/2 limit, several interloper