Abstract
This paper describes a unique set of apparatus created at NPO State Institute of Applied Optics
for the investigation of complex molecules at high temperatures under vacuum and the
results of a study of the fine-structure fluorescence spectra of complex molecules of aromatic
compounds obtained using this apparatus. A comparative analysis is given of the quasiline
spectra of the molecules of certain aromatic compounds at low temperatures, obtained under
conditions of matrix isolation and jet-cooled gas flows. Starting from the concept of the
formation and origin of the fine-structure spectra of complex molecules developed earlier by the
authors, two groups of spectroscopic effects are considered that make it possible to
determine the elementary processes that control the conversion of the photon absorbed by the
molecule. The first group includes the regularities describing how the quasi-lines of the
fine-structure spectra depend on the energy of the excitation quanta, while the second includes
the regularities associated with the multiplet structure of the individual lines of the fine
structure.
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