Emission spectra of alkali-metal (K,Na,Li)-He exciplexes in cold helium gas
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan)
We have observed emission spectra of excimers and exciplexes composed of a light alkali-metal atom in the first excited state and {sup 4}He atoms [K*He{sub n} (n=1-6), Na{sup *}He{sub n} (n=1-4), and Li{sup *}He{sub n} (n=1,2)] in cryogenic He gas (the temperature 2 K<T<100 K) in the spectral range from the atomic D lines to 6300 cm{sup -1}. Differently from exciplexes with heavier alkali-metal atoms, the spectra for the different number of He atoms were well separated, so that their assignment could be made experimentally. Comparing with the spectra of K{sup *}He{sub n}, we found that the infrared emission spectrum of the K atom excited in liquid He was from K*He{sub 6}. To confirm the assignment, we have also carried out ab initio calculation of adiabatic potential curves and peak positions of the emission spectra of the exciplexes.
- OSTI ID:
- 20640596
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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