On Anomalous Fluorescence of Symmetrical Polymethine Dyes
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 t...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | International Journal of Optics |
| Online Access: | http://dx.doi.org/10.1155/2020/6953206 |
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| author | P. O. Kondratenko Yu. M. Lopatkin |
| author_facet | P. O. Kondratenko Yu. M. Lopatkin |
| author_sort | P. O. Kondratenko |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-b9105966f6fb42ed8d46736416ceed1c |
| institution | DOAJ |
| issn | 1687-9384 1687-9392 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Optics |
| spelling | doaj-art-b9105966f6fb42ed8d46736416ceed1c2025-08-20T03:22:50ZengWileyInternational Journal of Optics1687-93841687-93922020-01-01202010.1155/2020/69532066953206On Anomalous Fluorescence of Symmetrical Polymethine DyesP. O. Kondratenko0Yu. M. Lopatkin1Department of Theoretical and Applied Physics, Aerospace Institute, National Aviation University, 1 Cosmonaut Komarov Avenue, Kyiv 03680, UkraineDepartment of Electronics, General and Applied Physics, Sumy State University, 2 Rimsky-Korsakov Street, Sumy 40007, UkraineThe 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.http://dx.doi.org/10.1155/2020/6953206 |
| spellingShingle | P. O. Kondratenko Yu. M. Lopatkin On Anomalous Fluorescence of Symmetrical Polymethine Dyes International Journal of Optics |
| title | On Anomalous Fluorescence of Symmetrical Polymethine Dyes |
| title_full | On Anomalous Fluorescence of Symmetrical Polymethine Dyes |
| title_fullStr | On Anomalous Fluorescence of Symmetrical Polymethine Dyes |
| title_full_unstemmed | On Anomalous Fluorescence of Symmetrical Polymethine Dyes |
| title_short | On Anomalous Fluorescence of Symmetrical Polymethine Dyes |
| title_sort | on anomalous fluorescence of symmetrical polymethine dyes |
| url | http://dx.doi.org/10.1155/2020/6953206 |
| work_keys_str_mv | AT pokondratenko onanomalousfluorescenceofsymmetricalpolymethinedyes AT yumlopatkin onanomalousfluorescenceofsymmetricalpolymethinedyes |