Ultrafast decay dynamics of electronically excited 2-ethylpyrrole

2021 ◽  
Author(s):  
Wenpeng Yuan ◽  
Dongyuan Yang ◽  
Baihui Feng ◽  
Yanjun Min ◽  
Zhichao Chen ◽  
...  
Keyword(s):  
Excited State ◽  
Wavelength Range ◽  
Photoelectron Spectra ◽  
Imaging Method ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
State Decay ◽  
Electronically Excited ◽  
Uv Excitation

The excited-state decay dynamics of 2-ethylpyrrole following UV excitation at a wavelength range of 254.8-218.0 nm is investigated in detail using femtosecond time-resolved photoelectron imaging method. The time-resolved photoelectron spectra...

Time-Resolved X-ray Scattering of an Electronically Excited State in Solution. Structure of the3A2uState of Tetrakis-μ-pyrophosphitodiplatinate(II)

2009 ◽  
Vol 131 (2) ◽  
pp. 502-508 ◽  
Author(s):  
Morten Christensen ◽  
Kristoffer Haldrup ◽  
Klaus Bechgaard ◽  
Robert Feidenhans’l ◽  
Qingyu Kong ◽  
...  
Keyword(s):  
Excited State ◽  
Solution Structure ◽  
Time Resolved ◽  
X Ray ◽  
Electronically Excited State ◽  
X Ray Scattering ◽  
Electronically Excited ◽  
Ray Scattering

Excited-state decay of hydrocarbon radicals, investigated by femtosecond time-resolved photoionization: Ethyl, propargyl, and benzyl

2005 ◽  
Vol 122 (9) ◽  
pp. 094302 ◽  
Author(s):  
Matthias Zierhut ◽  
Bastian Noller ◽  
Thomas Schultz ◽  
Ingo Fischer
Keyword(s):  
Excited State ◽  
Time Resolved ◽  
State Decay ◽  
Hydrocarbon Radicals

Observation of multi-channel non-adiabatic dynamics in aniline derivatives using time-resolved photoelectron imaging

2016 ◽  
Vol 194 ◽  
pp. 185-208 ◽  
Author(s):  
Magdalena M. Zawadzki ◽  
Marco Candelaresi ◽  
Lisa Saalbach ◽  
Stuart W. Crane ◽  
Martin J. Paterson ◽  
...  
Keyword(s):  
Excited State ◽  
Angular Distributions ◽  
Relaxation Dynamics ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Valence States ◽  
Ultimate Fate ◽  
Site Selective ◽  
Photoelectron Angular Distributions ◽  
Electronic Character

We present results from a recent time-resolved photoelectron imaging (TRPEI) study investigating the non-adiabatic relaxation dynamics of N,N-dimethylaniline (N,N-DMA) and 3,5-dimethylaniline (3,5-DMA) following excitation at 240 nm. Analysis of the experimental data is supported by ab initio coupled-cluster calculations evaluating excited state energies and the evolution of several excited state physical properties as a function of N–H/N–CH3 bond extension – a critical reaction coordinate. The use of site-selective methylation brings considerable new insight to the existing body of literature concerning photochemical dynamics in the related system aniline at similar excitation wavelengths. The present work also builds on our own previous investigations in the same species at 250 nm. The TRPEI method provides highly differential energy- and angle-resolved data and, in particular, the temporal evolution of the photoelectron angular distributions afforded by the imaging approach offers much of the new dynamical information. In particular, we see no clear evidence of the second excited 2ππ* state non-adiabatically coupling to the lower-lying S1(ππ*) state or the mixed Rydberg/valence S2(3s/πσ*) state. This, in turn, potentially raises some unresolved questions about the overall nature of the dynamics operating in these systems, especially in regard to the 2ππ* state's ultimate fate. More generally, the findings for the aromatic systems N,N-DMA and 3,5-DMA, taken along with our recent TRPEI results for several aliphatic amine species, highlight interesting questions about the nature of electronic character evolution in mixed Rydberg-valence states as a function of certain key bond extensions and the extent of system conjugation. We begin exploring these ideas computationally for a systematically varied series of tertiary amines.

Characterization of Rhodamine 6G-Doped Thin Sol-Gel Films

1993 ◽  
Vol 47 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Upvan Narang ◽  
Frank V. Bright ◽  
Paras N. Prasad
Keyword(s):  
Excited State ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Laser Illumination ◽  
State Decay ◽  
Sol Gel Films ◽  
Microscope Slides

Rhodamine 6G- (R6G) doped thin sol-gel films were cast on glass microscope slides and characterized with the use of steady-state and time-resolved fluorescence spectroscopy. The fluorescence intensity, photodegradation under laser illumination, and excited-state decay kinetics were all investigated as a function of dopant concentration. The excited-state decay kinetics of highly doped films show clear evidence of R6G aggregation. Photodegradation under laser illumination is very interesting and is discussed in detail.

scholarly journals Ultrafast photoisomerisation of an isolated retinoid

2019 ◽  
Vol 21 (20) ◽  
pp. 10567-10579 ◽  
Author(s):  
James N. Bull ◽  
Christopher W. West ◽  
Cate S. Anstöter ◽  
Gabriel da Silva ◽  
Evan J. Bieske ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Excited State ◽  
Gas Phase ◽  
Laser Spectroscopy ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Excited State Dynamics

The photoinduced excited state dynamics of gas-phase trans-retinoate (deprotonated trans-retinoic acid, trans-RA−) are studied using tandem ion mobility spectrometry coupled with laser spectroscopy, and frequency-, angle- and time-resolved photoelectron imaging.

scholarly journals Ultrafast valence to non-valence excited state dynamics in a common anionic chromophore

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
James N. Bull ◽  
Cate S. Anstöter ◽  
Jan R. R. Verlet
Keyword(s):  
Excited State ◽  
Internal Conversion ◽  
Rydberg States ◽  
Bound State ◽  
Photoactive Yellow Protein ◽  
Coumaric Acid ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Valence States

AbstractNon-valence states in neutral molecules (Rydberg states) have well-established roles and importance in photochemistry, however, considerably less is known about the role of non-valence states in photo-induced processes in anions. Here, femtosecond time-resolved photoelectron imaging is used to show that photoexcitation of the S1(ππ*) state of the methyl ester of deprotonated para-coumaric acid – a model chromophore for photoactive yellow protein (PYP) – leads to a bifurcation of the excited state wavepacket. One part remains on the S1(ππ*) state forming a twisted intermediate, whilst a second part leads to the formation of a non-valence (dipole-bound) state. Both populations eventually decay independently by vibrational autodetachment. Valence-to-non-valence internal conversion has hitherto not been observed in the intramolecular photophysics of an isolated anion, raising questions into how common such processes might be, given that many anionic chromophores have bright valence states near the detachment threshold.

Time-resolved photoelectron spectra as probe of excited state dynamics: A full quantum study of the Na2F cluster

2003 ◽  
Vol 118 (3) ◽  
pp. 1282-1291 ◽  
Author(s):  
Marie-Catherine Heitz ◽  
Gérard Durand ◽  
Fernand Spiegelman ◽  
Christoph Meier
Keyword(s):  
Excited State ◽  
Photoelectron Spectra ◽  
Time Resolved ◽  
Excited State Dynamics ◽  
Full Quantum
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