Abstract
Techniques of atomic fluorescence were used to determine cross sections for relaxation and decay of atomic multipole moments associated with the 42P1/2 and 42P3/2 states in potassium. 42P1/2-1/2or 2P3/2-3/2 Zeeman substates were selectively populated by irradiating potassium vapour, mixed with N2 or H2 and located in a kilogauss magnetic field, with monochromatic and circularly polarised radiation. Collisions with the buffer gas molecules caused the population of the other Zeeman substates and the emission of a Zeeman fluorescent spectrum, the sigma components of which were resolved with a piezoelectrically scanned Fabry-Perot interferometer. Measurements of the intensities of the Zeeman fluorescent components yielded cross sections for relaxation and decay of the dipole, quadrupole and octupole moments.
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