Absorption Spectrum of Lead Oxide

The spectrum of PbO has been photographed in absorption. A new system, designated as the

E

system, has been found. It is nearly coincident with the

D

system. A number of previously unclassified bands together with some new bands are assigned to a new system, replacing Mecke's

C

system. The

D

system has been extended and the new values require that

x_{e} {ω_{e}}^{'}

be changed from 1.05 to 3.13. All three systems have the same lower level in common with the

A

and

B

systems.

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