Abstract

The emission spectrum of doubly and triply ionized gadolinium from 1200 to 6000 Å is reported. A pulsed hollow-cathode light source was used with a 5-m Czerny–Turner vacuum spectrograph to obtain wavelengths and photoelectric intensities for 12 000 lines of doubly ionized gadolinium and 8000 lines of triply ionized gadolinium. For the fourth spectrum, a preliminary analysis indicates that the 4f⁶6s–4f⁶6p transitions occur at 45 000 cm⁻¹ and the 4f⁷–4f⁶5d transitions at 75 000 cm⁻¹. The stronger lines from these regions determine 32 low-lying levels of these configurations.

© 1970 Optical Society of America

Analysis of the Spectrum of Triply Ionized Manganese (Mn IV)*

Stanley J. Yarosewick and Frank L. Moore
J. Opt. Soc. Am. 57(11) 1381-1387 (1967)

Extension of the Analysis of Singly Ionized Gadolinium (Gd ii)*

Nissan Spector
J. Opt. Soc. Am. 60(6) 763-776 (1970)

Analysis of the Spectrum of Triply Ionized Magnesium (Mg iv)

Marie-Christine Artru and Victor Kaufman
J. Opt. Soc. Am. 62(8) 949-957 (1972)

Analysis of the Spectrum of Triply Ionized Praseodymium (Pr iv)

Jack Sugar
J. Opt. Soc. Am. 55(9) 1058-1059 (1965)

Spectrum of Doubly Ionized Gadolinium*

Wm. R. Callahan
J. Opt. Soc. Am. 53(6) 695-700 (1963)