1. Observation of Broadband Ultraviolet Emissions From Hg3*
Laboratory for Optical Physics and Engineering
Observation of Broadband Ultraviolet Emissions From Hg3*
Wenting Wendy Chen, Thomas C. Galvin, J. Gary Eden
June 21, 2016

2. Abstract
Two previously-unobserved emission continua, peaking at ∼ 380 nm and ∼ 273 nm, have been observed when Hg vapor is photoexcited at 248 nm (KrF laser).
Comparisons of the observed spectra with theory[1] suggest that the observed continua are the result of transitions between pairs of electronic states having a triangular (C2v) configuration.
[1] H. Kitamura, Chemical Physics 325, 207 (2006).

3. Spectra Produced by 248 nm Photoexcitation

4. Comparison of Spectra For λp=248 nm and 266 nm

5. Theoretically Calculated Upper States for 485 nm and 380 nm Trimer Transitions
Kitamura, Chemical Physics 325, 207 (2006)

6. Theoretically Calculated Upper States for 273 nm Trimer Transition
Kitamura, Chemical Physics 325, 207 (2006)

7. Theoretical and Experimental Spectra

8. 380 nm and 485 nm Waveforms

9. 380 nm Decay Rates

10. Fitting of 380 nm Decay Rates

11. 520 nm Decay Rates

12. 273 nm Waveform

13. Conclusions
New emission transition continuum bands centered at ∼ 380 nm and ∼ 273 nm were observed for the first time when Hg vapor is photoexcited at 248 nm.
Comparisons with theoretical predictions suggest these continua are unobserved Hg3 bands.