Fluorescence is generally measured at a 90° angle from the excitation source to minimize collection of scattered light from the excitation source, often such a rotation is provided by a Pellin–Broca prism on a turntable which will also separate the light into its spectrum for closer analysis.
Rapoport also served on the Russian Academy of Science's Scientific Council for Atomic Spectroscopy and Scientific Council for Coherent and Nonlinear Optics.
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The Grotrian diagram in atomic spectroscopy showing the allowed transitions between atomic energy levels