On Anomalous Fluorescence of Symmetrical Polymethine Dyes
Joint Authors
Kondratenko, Petro
Lopatkin, Yu. M.
Source
International Journal of Optics
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-05-14
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
The group-theoretical analysis of polymethine dyes (PMD) showed that relaxation processes between the states S3 and S1 are forbidden, either by radiation or by internal conversion.
From the state S3, only transition to the ground state of the molecule is possible.
Since the experimental data state that the quantum yield of S3 ⟶ S0 fluorescence does not exceed 1%, it is indicated that the internal conversion rate can be 2 orders of magnitude higher than the radiative relaxation rate of the molecule.
Concerning the reasons for the appearance of fluorescence from the higher excited states of molecules, it can be asserted that the necessary condition for the appearance of S3 ⟶ S0 fluorescence is the absence of S0 ⟶ S1(v)-absorption in the region of the S0 ⟶ S3 transition.
The sufficient condition is the corresponding symmetry of the excited states, which imposes a prohibition on the S3 ⟶ S1 relaxation process.
American Psychological Association (APA)
Kondratenko, Petro& Lopatkin, Yu. M.. 2020. On Anomalous Fluorescence of Symmetrical Polymethine Dyes. International Journal of Optics،Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1172974
Modern Language Association (MLA)
Kondratenko, Petro& Lopatkin, Yu. M.. On Anomalous Fluorescence of Symmetrical Polymethine Dyes. International Journal of Optics No. 2020 (2020), pp.1-8.
https://search.emarefa.net/detail/BIM-1172974
American Medical Association (AMA)
Kondratenko, Petro& Lopatkin, Yu. M.. On Anomalous Fluorescence of Symmetrical Polymethine Dyes. International Journal of Optics. 2020. Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1172974
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1172974