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Collisional Depolarization of Luminescence of Polyatomic Molecules with Internal Rotations
Abstract
A generalized diffusion model of rotational depolarization of luminescence of polyatomic molecules with internal rotators is developed under the assumption of independent collision statistics for internal rotations and rotation of the molecules as a whole. The model is used to calculate the collisional depolarization of non-rigid oligonucleotides with fluorescent labels that are in the free state in solutions and in complex with nanoparticles. The changes in the fluorescence anisotropy during relaxation are analyzed depending on the ratio of the inertia moments of the moving parts of the molecule and the transition moments orientation. The conditions for possible enhancement of anisotropy and control of changes in the structure of biomolecules during their immobilization on the surface of nanoparticles are evaluated.
About the Author
A. P. Blokhin
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Minsk
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Review
For citations:
Blokhin A.P. Collisional Depolarization of Luminescence of Polyatomic Molecules with Internal Rotations. Zhurnal Prikladnoii Spektroskopii. 2021;88(5):701-710. (In Russ.)
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