Abstract
The thermal emission spectrum of the YbCl molecule, lying in the 3800–6000 Å region, has been photographed for the first time at a reciprocal linear dispersion of 7.3 Å/mm. More than 196 violet degraded bands have been recorded on a 2-m plane grating spectrograph in first order and assigned to the vibrational schemes of six systems, viz.A,B1,B2,C1,C2, andD. While the systemsA,C1,C2, andDconsist of single headed bands, the systemsB1andB2consist of double headed bands. The vibrational analysis performed suggests that these systems arise from the ground state (2Σ+) of YbCl molecule. The systemsC1–X,C2–X, andD–Xhave been analyzed for the first time. More precise vibrational constants for the relevant states have been determined.
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