ARC spectrum of silicon in the red and infrared

No accurate description of the red and infrared portion of the arc spectrum of silicon has been published in the 40 years that have elapsed since Rowland's work which terminated at 5,948 A. In this paper, wave lengths are given for 130 new lines between 6,125 and 11,290 A, many of which are present in the solar spectrum, including the strongest hitherto unidentified Fraunhofer line. More than 50 percent of these lines have been classified as combinations between new terms and terms already established for Si I. The new terms arise from the electron configurations containing the 4p, 4/, and 5/ electrons.