Abstract
The short-wavelength bands generated in Rydberg matter (RM) formed by K atoms have been studied both in an operating laser cavity and by amplified emission in the RM, with higher resolution than previously. Transitions down to principal quantum number n′′≥6 in the core ions have been identified previously in the infrared range, while transitions down to n′′=5 and 4 are now observed for transitions of the type n′′=7→4. Efficient down-conversion of emitted wavelengths shorter than 800 nm is found in the RM medium in the cavity by a process similar to two-photon emission. From the good description of the transitions with just one quantum number n′′, it is concluded that the transitions studied are single-electron transitions in the core ions coupled to the conduction band; two-electron processes as proposed previously are not involved in this wavelength range where the change in angular momentum is relatively small.
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42.70.Hj; 78.45.+h; 42.62.Fi; 42.55.Lt
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Holmlid, L. Stimulated emission spectroscopy of Rydberg matter: observation of Rydberg orbits in the core ions. Appl. Phys. B 87, 273–281 (2007). https://doi.org/10.1007/s00340-007-2579-9
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DOI: https://doi.org/10.1007/s00340-007-2579-9