scholarly journals Vibrational Relaxation and Redistribution Dynamics in Ruthenium(II) Polypyridyl-Based Charge-Transfer Excited States: A Combined Ultrafast Electronic and Infrared Absorption Study

2018 ◽  
Vol 122 (40) ◽  
pp. 7941-7953 ◽  
Author(s):  
Allison M. Brown ◽  
Catherine E. McCusker ◽  
Monica C. Carey ◽  
Ana Maria Blanco-Rodríguez ◽  
Michael Towrie ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Infrared Absorption ◽  
Vibrational Relaxation ◽  
Absorption Study

scholarly journals Time-resolved infrared-absorption study of photoinduced charge transfer in a polythiophene-methanofullerene composite film

2000 ◽  
Vol 61 (15) ◽  
pp. 9917-9920 ◽  
Author(s):  
S. C. J. Meskers ◽  
P. A. van Hal ◽  
A. J. H. Spiering ◽  
J. C. Hummelen ◽  
A. F. G. van der Meer ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Composite Film ◽  
Infrared Absorption ◽  
Absorption Study ◽  
Photoinduced Charge Transfer ◽  
Time Resolved ◽  
Photoinduced Charge

The Deep Impurity Conduction Band Charge Transfer Transition In ZnSe:Co

1982 ◽  
Vol 304 (1487) ◽  
pp. 499-531 ◽  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Conduction Band ◽  
Infrared Absorption ◽  
High Energy ◽  
Excitation Spectra ◽  
Deep Impurity ◽  
Infrared Luminescence ◽  
Complete Account

Novel absorption and luminescence features observed in ZnSe:Co were described briefly in a recent paper. The associated transitions involve three high energy excited states, L, M and N, of Co|£. This is established from the appearance of these transitions in the excitation spectra of the 4 T 2 -> 4 A 2 infrared luminescence of C o|£ and the observation of luminescence from the lowest excited state L to four different spin quartet states of Co 2+ whose energy separations are accurately known from infrared absorption. The present paper contains a m uch more complete account of the experiNovel absorption and luminescence features observed in ZnSe: Co were described briefly in a recent paper. The associated transitions involve three high energy excited states, L, M and N, of Co|£. This is established from the appearance of these transitions in the excitation spectra of the 4T 2 -> 4A2 infrared luminescence of C o|£ and the observation of luminescence from the lowest excited state L to four different spin quartet states of Co2+ whose energy separations are accurately known from infrared absorption. The present paper contains a much more complete account of the experimental properties of these new transitions, including a detailed study of the magneto-optical properties and behaviour under uniaxial stress of transition L and its satellites. Among three possible models for the new states, two are discarded, particularly in view of the weak phonon coupling and the symmetric positive form of the L, M and N absorption lines. The remaining model is closely associated with the impurity -> conduction band charge transfer process since the excited states are described w ith two weakly interacting parts, the Co 3+ im purity core and a relatively weakly bound electron in three different syfnmetric excited states. The symmetry and F-value of excited state L are readily described by a Hamiltonian containing spin—orbit and exchange in teraction terms. However, the properties of the lower satellite L ' (2.363 eV) indicate a vibronic character which requires a dynamic Jahn-Teller interaction term . The parameters of the model required by experiment appear reasonable.

scholarly journals Infrared Absorption Study of Zinc-Doped Silicon.

1989 ◽  
Vol 163 ◽  
Author(s):  
E. Merk ◽  
J. Heyman ◽  
E. E. Haller
Keyword(s):  
Excited States ◽  
Infrared Absorption ◽  
Absorption Study ◽  
Rydberg Series ◽  
Cell Potential ◽  
Group Iii ◽  
Mass Approximation ◽  
Doped Silicon ◽  
First Time ◽  
Hole Transition

AbstractWe report high resolution infrared absorption spectra associated with the deep zinc acceptor in silicon. The optical transitions between ground and bound excited “p-like” states of the neutral helium-like double acceptor Zn0 center have been observed for the first time. The absorption cross section for the hole transition is found to be very small, of the order of 10-17 cm2. Energy spacings of the P3/2 Rydberg series are very similar to the spacings of the group-III acceptors, suggesting that, in spite of the large ground state binding energy, effective mass approximation still applies to the bound excited states. This represents one more case where the strong central cell potential does not significantly disturb the neutral helium-like bound excited states. Similar observations have been made for the less deep neutral double acceptor Be, and for the chalcogens donors S, Se and Te.The optical ionization energy of Zn0/- has been determined to be 2575 cm-1 (319 meV).Two additional sets of absorption lines related to zinc have been observed at 2130 cm-1 and 2758 cm-1. Their origin will be discussed.

Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

Charge Transfer Between CO22+ and Ar or Ne at Collision Energies 3-10 eV

2003 ◽  
Vol 68 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Libor Mrázek ◽  
Ján Žabka ◽  
Zdeněk Dolejšek ◽  
Zdeněk Herman
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ground State ◽  
Scattering Method ◽  
Translational Energy ◽  
Centre Of Mass ◽  
Energy Distributions ◽  
Zener Model ◽  
Beam Scattering ◽  
Product Ions

The beam scattering method was used to investigate non-dissociative single-electron charge transfer between the molecular dication CO22+ and Ar or Ne at several collision energies between 3-10 eV (centre-of-mass, c.m.). Relative translational energy distributions of the product ions showed that in the reaction with Ar the CO2+ product was mainly formed in reactions of the ground state of the dication, CO22+(X3Σg-), leading to the excited states of the product CO2+(A2Πu) and CO2+(B2Σu+). In the reaction with Ne, the largest probability had the process from the reactant dication excited state CO22+(1Σg+) leading to the product ion ground state CO2+(X2Πg). Less probable were processes between the other excited states of the dication CO22+, (1∆g), (1Σu-), (3∆u), also leading to the product ion ground state CO2+(X2Πg). Using the Landau-Zener model of the reaction window, relative populations of the ground and excited states of the dication CO22+ in the reactant beam were roughly estimated as (X3Σg):(1∆g):(1Σg+):(1Σu-):(3∆u) = 1.0:0.6:0.5:0.25:0.25.

scholarly journals Modulation of charge transfer by N-alkylation to control photoluminescence energy and quantum yield

2020 ◽  
Vol 11 (27) ◽  
pp. 6990-6995 ◽  
Author(s):  
Andrew T. Turley ◽  
Andrew Danos ◽  
Antonio Prlj ◽  
Andrew P. Monkman ◽  
Basile F. E. Curchod ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Yield ◽  
Excited States

A versatile N-alkylation strategy controls the presence of charge-transfer excited states and the emission colour of N-heterocyclic chromophores.

Time-resolved infrared absorption study of nine TiO2 photocatalysts

2007 ◽  
Vol 339 (1-3) ◽  
pp. 133-137 ◽  
Author(s):  
Akira Yamakata ◽  
Taka-aki Ishibashi ◽  
Hiroshi Onishi
Keyword(s):  
Infrared Absorption ◽  
Absorption Study ◽  
Time Resolved ◽  
Tio2 Photocatalysts
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