Abstract
The violet-degraded band system (3400–3700 Å) has been found in the spectrum of a discharge through helium with a trace of YF 3 vapor. The emitter of this system is the hitherto unknown YF + ion. Vibrational analysis of the band system has been carried out. Rotational analysis has shown that the bands are due to the 2Π- 2Δ transition. Molecular orbital configurations which give rise to both participating states are discussed. The 1Σ- X 1Σ (0-0) band of YF (λ3572 Å) obtained in absorption has been reanalyzed.
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