Excited state formation in low energy Li+–surface collisions

1993 ◽  
Vol 11 (4) ◽  
pp. 2133-2137 ◽  
Author(s):  
D. R. Andersson ◽  
E. R. Behringer ◽  
B. H. Cooper ◽  
J. B. Marston
Keyword(s):  
Excited State ◽  
State Formation ◽  
Low Energy

scholarly journals Ultrafast excited state dynamics and light-switching of [Ru(phen)2(dppz)]2+ in G-quadruplex DNA

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Chunfan Yang ◽  
Qian Zhou ◽  
Zeqing Jiao ◽  
Hongmei Zhao ◽  
Chun-Hua Huang ◽  
...  
Keyword(s):  
Excited State ◽  
State Formation ◽  
Rational Design ◽  
Bound Water ◽  
Binding Modes ◽  
Relaxation Dynamics ◽  
Dark State ◽  
Excited State Dynamics ◽  
G Quadruplex ◽  
Mechanistic Basis

AbstractThe triplet metal to ligand charge transfer (3MLCT) luminescence of ruthenium (II) polypyridyl complexes offers attractive imaging properties, specifically towards the development of sensitive and structure-specific DNA probes. However, rapidly-deactivating dark state formation may compete with 3MLCT luminescence depending on different DNA structures. In this work, by combining femtosecond and nanosecond pump-probe spectroscopy, the 3MLCT relaxation dynamics of [Ru(phen)2(dppz)]2+ (phen = 1,10-phenanthroline, dppz = dipyridophenazine) in two iconic G-quadruplexes has been scrutinized. The binding modes of stacking of dppz ligand on the terminal G-quartet fully and partially are clearly identified based on the biexponential decay dynamics of the 3MLCT luminescence at 620 nm. Interestingly, the inhibited dark state channel in ds-DNA is open in G-quadruplex, featuring an ultrafast picosecond depopulation process from 3MLCT to a dark state. The dark state formation rates are found to be sensitive to the content of water molecules in local G-quadruplex structures, indicating different patterns of bound water. The unique excited state dynamics of [Ru(phen)2(dppz)]2+ in G-quadruplex is deciphered, providing mechanistic basis for the rational design of photoactive ruthenium metal complexes in biological applications.

Role of Surface Interactions in Beam-Foil Excited-State Formation

1981 ◽  
Vol 47 (7) ◽  
pp. 487-490 ◽  
Author(s):  
N. H. Tolk ◽  
L. C. Feldman ◽  
J. S. Kraus ◽  
J. C. Tully ◽  
M. Hass ◽  
...  
Keyword(s):  
Excited State ◽  
State Formation ◽  
Surface Interactions ◽  
Beam Foil

Electronically Excited State Formation

1994 ◽  
pp. 384-399
Author(s):  
Enrique Cadenas ◽  
Cecilia Giulivi ◽  
Fulvio Ursini ◽  
Alberto Boveris
Keyword(s):  
Excited State ◽  
State Formation ◽  
Electronically Excited State ◽  
Electronically Excited

Photoinduced ligand dissociation follows reverse energy gap law: nitrile photodissociation from low energy 3MLCT excited states

2020 ◽  
Vol 56 (29) ◽  
pp. 4070-4073
Author(s):  
Lauren M. Loftus ◽  
Jeffrey J. Rack ◽  
Claudia Turro
Keyword(s):  
Excited State ◽  
Excited States ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Energy Gap ◽  
Low Energy ◽  
Transient Absorption Spectroscopy ◽  
Ligand Dissociation ◽  
Energy Gap Law

Transient absorption spectroscopy is used to show that stabilization of the 3MLCT excited state in a series of Ru(ii) complexes leads to decreased population of the 3LF state, but does not reduce the efficiency of photoinduced nitrile dissociation.

scholarly journals Low energy excited state vibrations revealed in conjugated copolymer PCDTBT

2020 ◽  
Vol 152 (4) ◽  
pp. 044201
Author(s):  
Shawn Irgen-Gioro ◽  
Palas Roy ◽  
Suyog Padgaonkar ◽  
Elad Harel
Keyword(s):  
Excited State ◽  
Low Energy ◽  
Conjugated Copolymer

Spontaneous Tunnel Transitions Induced by Redistribution of Trapped Electrons over Impurity Centers

1983 ◽  
Vol 38 (9) ◽  
pp. 959-962
Author(s):  
A. A. Berezin
Keyword(s):  
Excited State ◽  
Charge State ◽  
Ground State ◽  
Low Energy ◽  
Energy Photon ◽  
Impurity Site ◽  
The Third ◽  
Tunnel Transition ◽  
Extra Electron ◽  
Impurity Centers

Abstract A system of polyvalent impurity centers in a semiconductor (i.e. Au-centers in Si) is con-sidered. The ground state of the impurity pair Au-(a) + Au° (b), where an extra electron is localized on the site a, may be turned into an excited state due to a change of the charge state of a third nearby impurity site. This happens because of different shifts of the Au--level at sites a and b due to their different distances from the third center. As a result, the original pair is able to reach a new ground state Au° (a) + Au- (b) through a slow spontaneous tunnel transition. The probability of this transition, when it is accompanied by an emission of a low energy photon, is calculated explicitly.

Distance of Excited-State Formation in Ion-Surface Collisions

1986 ◽  
Vol 57 (21) ◽  
pp. 2649-2652 ◽  
Author(s):  
Joachim Burgdörfer ◽  
Eckart Kupfer
Keyword(s):  
Excited State ◽  
State Formation

Excited-state formation asH+andHe+ions scatter from metal surfaces

1975 ◽  
Vol 12 (3) ◽  
pp. 876-884 ◽  
Author(s):  
W. E. Baird ◽  
M. Zivitz ◽  
E. W. Thomas
Keyword(s):  
Excited State ◽  
State Formation ◽  
Metal Surfaces
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