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Abstract : |
The role of some intermediate states, e.g. 4s5p P-3, 3d4p (D-1, F-3) of Ca I in the collisional excitation of the 4p P-2(3/2,1/2) states of Ca II (located at 74 720.35 and 74 497.46 cm(-1) above the ground state of Ca I) following pulsed-laser pumping of the 4s4p P-3(1) state of Ca I (E(ex) = 15 210.063 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 P-2(3/2)-4s S-2(1/2) 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 D-1(2) state has the strongest influence., |
