Abstract

The second spectrum of arsenic has been investigated over the spectral region 701–11 064 Å by means of high-resolution grating spectrographs and the Fabry–Perot interferometer. The light sources were electrodeless discharge tubes. Wavelengths of As ii lines have been measured relative to thorium or iron standards in the region above 2000 Å and relative to silicon and germanium standards or persistent well-known impurity lines of C, N, O, etc., in the region below 2000 Å. For interferometric measurements, the 198Hg lines 2537 and 5462 Å were used as standards. The total number of measured As ii lines is 1034 of which 391 are newly found and 987 are now classified. This includes 540 newly classified lines that either establish new levels or fill gaps in the previously known level array. The analysis of As ii has been extended by the addition of 44 new even levels and 37 new odd levels. Reassignment has been made of three even and three odd previously found levels. The total number of classified levels is 76 even and 90 odd. The series limit of As ii identified with ²P12 As iii was calculated from 12 Rydberg series to be 149 932±8 cm−1 corresponding to an ionization potential of 18.588±0.001 V for the As+ ion.

© 1971 Optical Society of America

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