Abstract

We report tri-level echo measurements of collision cross-sections and broadening constants for the electric-dipole-forbidden fine-structure transition in caesium (7p 1 2 - 7P 3 2 ) perturbed by low pressures (< 1 torr) of He, Ne, A, Kr, Xe. The hyperfine structures of the levels were not resolved. A brief description of the tri-level echo mechanism is given.

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