Specular reflection and absorption edges of xenon difluoride single crystals in the near ultraviolet
✍ Scribed by C.J. Eckhardt; G.D. Sturgeon
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 272 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The specular reflection spectra of xenon difluoride singk crystals were observed in the 25 to 44 kK reaion. A nreviouslv unreported band was observed with a peak reflectivity at 30.6 kK. It is suggested thii aiises from a &ngletGriplet transition.
In his studies of powdered xenon difluoridetantalum pontafluoride adducts using diffuse reflectance, Lawrence [l] reportea an absorption in the 25 to 40 kX region which, surprisingly, was also observed for pure xenon &fluoride. This absorption is not observed for gaseous xenon difluoride. We have studied the reflec-Jance and absorption spectra of xenon dlfluoride single crystals in order to confkn the phenomenon and to seek a-rationale for its occurance.
For this study xenon difluoride was prepared by direct reaction of the elements under ultraviolet radiation. The vapor phase spectrum of the vaporized crystals in the region 47.6 to 36.0 kX was consistent with that reported by Pysh et al. [Z]. .At high vapor concentrations (ca. 0.005M) at 75oC the red tail of the 43 kX vibronically allowed band shows finite absorption to 28 kK. However, the band tail is structurelless &d there is no clear indication of an additional absorption band. This low absorption could be due to another electronic transition.
Because of the-reactivity and volatility of the crystals, it was necessary to introduce them into a baked-out and evacuated optical cell of ultraviolet grade fused silica. The crystals were completely stable under these conditions. The crystals faces from which the specular reflection was taken were not in contact with any sur-