Laser excitation spectrum of PbO: Rotational analysis of the a(1)-X(0+) system |
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Authors: | J.M Brom W.H Beattie |
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Affiliation: | Quantum Institute, University of California, Santa Barbara, California 93106 USA |
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Abstract: | A flashlamp-pumped tunable dye laser has been used to investigate the a-X band system of PbO. Spectra with resolution adequate for rotational analysis were obtained by exciting a-X photoluminescence with the laser operating at a bandwidth of 0.2 cm?1. The (3,1) and (4,1) bands have been rotationally analyzed, providing the rotational constants B3 = 0.2389 ± 0.0002 cm?1 and B4 = 0.2374 ± 0.0002 cm?1 for the a state. Observation of P, Q, and R branch structure confirms the assignment of the a state as a Hund's case (c), state of PbO. Calculated combination defects having positive algebraic sign support the presence of a b(0?) state approximately 350 cm?1 above the a(1) state. |
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