Abstract
We report the first experimental observation of the excitation of the 4p2P3/2, 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 4s21SO−4s4p3P1 intercombination transition of Ca I (Eex = 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 4s4p3P1 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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