Physical Properties of Scandium

The most intense lines in the arc and spark spectra of scandium are as follows: -

spark: 3353.89, 3558.71, 3567.88, 3572.72, 3576.53, 3581.15, 3613.98, 3630.90, 3642.96, 3651.96, 4247.00, 4314.25, 4320.91, 4325.15, 4374.68, 4400.56, 4415.72.

arc: 3353.89, 3372.33, 3558.69, 3567.88, 3572.72, 3576.53, 3613.98, 3630.90, 3642.96, 3907.69, 3912.03, 4020.55, 4023.83, 4247.00, 4314.25, 4320.91, 4325.15, 4374.68, 4400.56, 4415.72, 6305.88.

The arc spectrum of scandium consists of two distinct sets of lines which behave very differently in solar spectra. One of these sets corresponds to the "enhanced" lines of other elements. The arc spectrum when taken in air shows very characteristic flutings due to scandium oxide. They disappear when the arc is taken in hydrogen, and at the same time the spectrum approximates to that observed with the spark discharge (Fowler).