scholarly journals Quenching of ketone triplet excited states by atmospheric halides

2021 ◽  
Author(s):  
R. Gemayel ◽  
C. Emmelin ◽  
S. Perrier ◽  
S. Tomaz ◽  
V. J. Baboomian ◽  
...  
Keyword(s):  
Excited States ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Secondary Organic Aerosols ◽  
Organic Aerosols ◽  
Transient Absorption Spectroscopy ◽  
Aromatic Ketones ◽  
Photo Oxidation ◽  
Triplet Excited States

The photosensitized chemistry of three aromatic ketones (xanthone, flavone, and acetophenone) and also of secondary organic aerosols (SOAs) arising from the photo-oxidation of naphthalene was investigated by means of transient absorption spectroscopy.

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.

Investigation of ultrafast excited state dynamics of 2,2′,4,4′,6,6′-hexanitrostilbene using femtosecond transient absorption spectroscopy

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60382-60385 ◽  
Author(s):  
Genbai Chu ◽  
Min Shui ◽  
Ying Xiong ◽  
Jing Yi ◽  
Kemei Cheng ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Excited State Dynamics ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy

A study on the dynamics and structures of the excited states of 2,2′,4,4′,6,6′-hexanitrostilbene shows equilibrium between vibrationally hot S1 (S*1) and S1 states with lifetimes of 0.8 and 6 ps, respectively.

Oxygen diffusion dynamics in organic semiconductor films

2015 ◽  
Vol 3 (39) ◽  
pp. 10079-10084 ◽  
Author(s):  
Safa Shoaee ◽  
James R. Durrant
Keyword(s):  
Excited States ◽  
Absorption Spectroscopy ◽  
Organic Semiconductor ◽  
Oxygen Diffusion ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Semiconductor Films ◽  
Diffusion Dynamics ◽  
Kinetics Of

Transient absorption spectroscopy is commonly used to probe the yield and kinetics of excited states of materials.

Excited state dynamics of symmetric and asymmetric Cr3(dpa)4Cl2 measured using femtosecond transient absorption spectroscopy

2017 ◽  
Vol 19 (37) ◽  
pp. 25471-25477 ◽  
Author(s):  
Chao-Han Cheng ◽  
Wen-Zhen Wang ◽  
Shie-Ming Peng ◽  
I-Chia Chen
Keyword(s):  
Excited State ◽  
Excited States ◽  
Metal Atom ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Chain Complex ◽  
Transient Absorption Spectroscopy ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Atom Chain

Relaxation pathway of excited states in extended metal atom chain complex Cr3(dpa)4Cl2.

Nonthermalized excited states in Ru(II) polypyridyl complexes probed by ultrafast transient absorption spectroscopy with high photon energy excitation

2008 ◽  
Vol 86 (12) ◽  
pp. 1118-1125 ◽  
Author(s):  
Sherri A McFarland ◽  
Karen AWY Cheng ◽  
Felix S Lee ◽  
Frances L Cozens ◽  
Norman P Schepp
Keyword(s):  
Excited State ◽  
Excited States ◽  
Photon Energy ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Singular Value ◽  
Transient Absorption Spectroscopy ◽  
Energy Excitation ◽  
Polypyridyl Complexes ◽  
Value Decomposition

The picosecond excited state dynamics of a series of homoleptic Ru(II) polypyridyl complexes (where LL = bpy, dmb, dmeob, dfmb, or dttb) have been investigated in aqueous solution at room temperature using femtosecond transient absorption spectroscopy with high photon energy excitation. All of the complexes studied produced similar spectroscopic signatures: a near-instantaneous bleach centered at 470–500 nm corresponding to the static absorption spectrum, as well as an intense absorption (475–650 nm) that decayed within the instrument response function (IRF) to form a broad, low-level absorption extending from 500–650 nm. Detailed analyses of both kinetic and spectral parameters by singular value decomposition (SVD) indicate that the excited state difference spectra contain contributions from at least three distinguishable species that have been assigned as ligand-based π* ← π* and ligand-to-metal-charge-transfer (LMCT) transitions concomitant with the loss of the ground state metal-to-ligand-charge-transfer (MLCT) transition. Kinetic information extracted at 530 nm (an optical marker for the fully intraligand-delocalized 3MLCT state) or 660 nm (LMCT transitions) appear to be biphasic in some cases with the amplitude of the IRF-limited component becoming larger with shorter wavelength excitation. Further, rise dynamics were observed at redder probe wavelengths for Ru(bpy)32+ and Ru(dttb)32+. These observations are different from those obtained using lower photon energy excitation and show that excitation wavelength strongly influences the early photophysical events in these Ru(II) complexes.Key words: ruthenium, photophysics, lasers, transient absorption spectroscopy, excited states, singular value decomposition (SVD).

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