Abstract
We report the first experimental observation of the excitation of the 4p 2 P 3/2, 1/2 resonance states of Ca II (located at 74 720.4 and 74 497.5 cm−1 above the ground state of Ca I) following pulsed-laser pumping of the 4s 2 1 S O−4s4p 3P1 intercombination transition of Ca I (E ex = 15 210 cm−1). Large scale collisional transfer of energy between the laser-excited atoms is believed to be responsible for this. This is possibly because sufficient time is available (τrad of the 4s4p 3 P 1 state is approximately 350 µs) for collisions to build such a high level of excitation. Some interesting additional features of the fluorescence spectra of the laser-pumped Ca vapor, such as temperature dependence of the fluorescence intensities and evolution in time of some selected states, are also presented.
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Khan, M.A., Gondal, M.A. & Rais, M.H. Large-scale collisional energy transfer in laser-pumped metastable Ca atoms: Excitation of resonance states of Ca II. Appl. Phys. B 61, 391–399 (1995). https://doi.org/10.1007/BF01081540
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DOI: https://doi.org/10.1007/BF01081540