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Laser Raman Spectroscopy of Tungsten-Halogen Bulbs

Volume 39, Number 1 (Feb. 1985) Page 137-142

Sell, J.A.; Eesley, G.L.; Simon, D.L.

Laser Raman spectroscopy is used to nondestructively measure molecular species that are found in tungsten-halogen bulbs. In particular, reactions are studied in an experimental bulb filled with CBrF3 in Kr. It was found that CBrF3 decomposes after ~10 seconds of accumulated burn time of the filament, and that Br2 forms and then decomposes. An unusually large Br2 signal was found to result from resonance fluorescence, as well as possible resonance Raman scattering. In addition, it was found that the compounds HBr, CO, and SIF4 formed and persisted in the bulb. Raman spectroscopy was also used to identify a solid deposit on the inside surface of the glass envelope as WO3(s). Finally, the total pressure of the bulb was measured nondestructively by Rayleigh scattering.