Abstract
The role of some intermediate states, e.g. 4s5p 3P, 3d4p(1D,3F) of Ca I in the collisional excitation of the 4p 2P3/2,1/2 states of Ca II (located at 74720.35 and 74497.46 cm-1 above the ground state of Ca I) following pulsed-laser pumping of the 4s4p 3P1 state of Ca I (Eex=15210.063 cm-1), is investigated. A 'pump' and 'probe' technique is employed together with the study of fluorescent emission. The 'probe' laser selectively prepares a substantially higher population of a specific intermediate state in Ca I and the increase in the fluorescent intensity of the 4p 2P3/2 - 4s 2S1/2 transition of Ca II is read as the relative strength of the particular collision channel utilizing that intermediate state. It is found that the 3d4p 1D2 state has the strongest influence.
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