Abstract
The emission, transition probability of the Ca (4s6sS14s4pP1) transition at 586.8 nm has been measured relative to the known strength of the Ca (4p2D14s4pP1) transition at 585.7 nm by two-step laser excitation. The ratio of transition probabilities was found to be A586.8A585.7=(3.5±0.5)×101 resulting in an A value for the 586.8-nm transition of 2.35×107 sec1.

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