Spectrophotometry of 11 intermediate redshift QSOs clearly shows the presence of a very broad emission feature from 2300 to 2600 A and other broad features at 2748, 2950, and 3200 A, all of which are interpreted as blended Fe II resonance lines. The strengths of these ultraviolet lines relative to those of the Fe II optical multiplets and other emission lines agree with Netzer's predictions from photoionization models of the broad-line regions of QSOs in which the Fe II is predominantly due to collisional excitation. Some new Mg II absorption line systems are noted.
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Wills et al. (1980) studied this question.