scholarly journals Dehydrogenation and Other Non-radiative Relaxation Processes in Gas-Phase Metal−DNA Base Complexes

2003 ◽  
Vol 107 (33) ◽  
pp. 6457-6463 ◽  
Author(s):  
David B. Pedersen ◽  
Marek Z. Zgierski ◽  
Benoit Simard
Keyword(s):  
Gas Phase ◽  
Relaxation Processes ◽  
Radiative Relaxation ◽  
Dna Base

Reactivity of Gas-Phase Benzene and Naphthalene Radical Cations withN-Methylimidazole, a Model DNA Base

1996 ◽  
Vol 118 (4) ◽  
pp. 853-859 ◽  
Author(s):  
Andy B. Whitehill ◽  
M. George ◽  
Michael L. Gross
Keyword(s):  
Gas Phase ◽  
Radical Cations ◽  
Dna Base

B-DNA model systems in non-terran bio-solvents: implications for structure, stability and replication

2017 ◽  
Vol 19 (26) ◽  
pp. 16969-16978 ◽  
Author(s):  
Trevor A. Hamlin ◽  
Jordi Poater ◽  
Célia Fonseca Guerra ◽  
F. Matthias Bickelhaupt
Keyword(s):  
Density Functional Theory ◽  
Gas Phase ◽  
Density Functional ◽  
Model Systems ◽  
Structure Stability ◽  
Implicit Solvation ◽  
Base Pairs ◽  
Functional Theory ◽  
Dna Base ◽  
Dna Base Pairs

We have computationally analyzed a comprehensive series of Watson–Crick and mismatched B-DNA base pairs, in the gas phase and in several solvents, including toluene, chloroform, ammonia, methanol and water, using dispersion-corrected density functional theory and implicit solvation.

Ultrafast Radiative Relaxation Processes in Multication Cross-Luminescence Materials

2020 ◽  
Vol 67 (6) ◽  
pp. 1009-1013
Author(s):  
Juhan Saaring ◽  
Eduard Feldbach ◽  
Vitali Nagirnyi ◽  
Sergey Omelkov ◽  
Alexander Vanetsev ◽  
...  
Keyword(s):  
Relaxation Processes ◽  
Radiative Relaxation

Electronic sputtering of solid N2 and O2: A comparison of non-radiative relaxation processes

1985 ◽  
Vol 164 (2-3) ◽  
pp. A737
Author(s):  
Frederick L. Rook ◽  
Robert E. Johnson ◽  
Walter L. Brown
Keyword(s):  
Relaxation Processes ◽  
Radiative Relaxation ◽  
Solid N2

Non-radiative relaxation processes of the Pr3+ ion

1995 ◽  
Vol 62 (4) ◽  
pp. 664-670 ◽  
Author(s):  
C. de Mello Donega ◽  
A. Meijerink ◽  
G. Blasse
Keyword(s):  
Relaxation Processes ◽  
Radiative Relaxation

Tautomerism of the DNA Base Guanine and Its Methylated Derivatives as Studied by Gas-Phase Infrared and Ultraviolet Spectroscopy

2002 ◽  
Vol 106 (20) ◽  
pp. 5088-5094 ◽  
Author(s):  
Michel Mons ◽  
Iliana Dimicoli ◽  
François Piuzzi ◽  
Benjamin Tardivel ◽  
Mohamed Elhanine
Keyword(s):  
Gas Phase ◽  
Ultraviolet Spectroscopy ◽  
Dna Base

scholarly journals On Anomalous Fluorescence of Symmetrical Polymethine Dyes

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
P. O. Kondratenko ◽  
Yu. M. Lopatkin
Keyword(s):  
Excited States ◽  
Ground State ◽  
Internal Conversion ◽  
Polymethine Dyes ◽  
Necessary Condition ◽  
Relaxation Processes ◽  
Sufficient Condition ◽  
Radiative Relaxation ◽  
Higher Excited States ◽  
Group Theoretical Analysis

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.

Structure and excited state properties of multiporphyrin arrays formed by supramolecular design

2003 ◽  
Vol 07 (11) ◽  
pp. 731-754 ◽  
Author(s):  
Eduard I. Zenkevich ◽  
Christian von Borczyskowski ◽  
Alexander M. Shulga
Keyword(s):  
Excited State ◽  
Photoinduced Electron Transfer ◽  
Spectral Properties ◽  
Photophysical Properties ◽  
Covalent Binding ◽  
Relaxation Processes ◽  
Radiative Relaxation ◽  
Time Resolved ◽  
Chemical Dimers ◽  
Femtosecond Time Scale

Structurally defined nanoscale self-assembled multiporphyrin arrays of variable geo-metry and composition (up to eight tetrapyrrole macrocycles) have been formed via two-fold extra-ligation in solutions at 77-293 K. The array formation is based on non-covalent binding interactions of the phenyl bridged Zn octaethylporphyrin chemical dimers or trimers, ( ZnOEP )2 Ph or ( ZnOEP )3 Ph 2, with di- and tetrapyridyl substituted tetrapyrrole extra-ligands (porphyrin, pentafluorophenyl substituted porphyrin, Cu porphyrin, tetrahydroporphyrin). Using steady-state and time-resolved measurements, spectral properties as well as pathways and dynamics of non-radiative relaxation processes (energy migration, photoinduced electron transfer, exchange d-π effects, realized in nano-femtosecond time scale) have been studied in these complexes upon variation of the composition, mutual geometry, redox and photophysical properties of interacting subunits as well as on the tempera-ture and polarity of surrounding.

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