The discharge in a water-cooled copper hollow cathode containing germanium and silicon was photographed with the NBS 10.7-m Eagle vacuum spectrograph to investigate a portion of the vacuum-ultraviolet spectrum of singly ionized copper in first, second, and third orders. The suitability for use as standards of thirty-two of the thirty-three Cu ii lines of the 4p–6s transitions for which Ritz calculations have been made was investigated. One hundred and eight other lines of Cu ii in the interval 861–1623 Å were observed and measured in the second and/or third orders, with estimated wavelength uncertainties of 0.0006 Å. These include two previously unobserved lines of the 4p–6s transitions, five members of the calculable 4s–5p transitions, and the three ground-state transitions (a1S0–4p1P1, 3P1, 3D1). The improved data for these three lines improve the accuracy of calculated shorter-wavelength lines.
Some vacuum-ultraviolet multiplets of C i, Si ii, and Ge ii in the wavelength range 1492–1602 Å, were also measured in second order. They lead to an extension, modification, or confirmation of previously calculated wavelengths of these spectra. A precise measurement of the Lyman Beta line of hydrogen in third order provides added confirmation of the presence of the Lamb shift of the 1 2S state of hydrogen.
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