Onset Times in Time-Resolved Photoelectron Spectra to Measure Ultrafast Non-Adiabatic Dynamics in Small Molecular Systems

2016 ◽  
Author(s):  
Elio G. Champenois ◽  
James P Cryan ◽  
Niranjan H. Shivaram ◽  
Travis W. Wright ◽  
Ali Belkacem
Keyword(s):  
Photoelectron Spectra ◽  
Time Resolved ◽  
Molecular Systems ◽  
Adiabatic Dynamics

Methyl substitution effects on the non-adiabatic dynamics of benzene: lifting three-state quasi-degeneracy at conical intersections

2020 ◽  
Vol 22 (5) ◽  
pp. 2814-2818
Author(s):  
Shunsuke Adachi ◽  
Toshinori Suzuki
Keyword(s):  
Photoelectron Spectra ◽  
Substitution Effects ◽  
Uv Laser ◽  
Conical Intersections ◽  
Time Resolved ◽  
Methyl Substitution ◽  
Methyl Derivatives ◽  
Adiabatic Dynamics ◽  
Vacuum Uv

Time-resolved photoelectron spectra of benzene and its methyl-derivatives (toluene and o-xylene) measured with a vacuum-UV laser clearly reveal both fast (A → B → C → D) and slow (B → C′ → D) relaxation channels from the S2 state.

scholarly journals Temperature-dependent photoluminescence properties of porous fluorescent SiC

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Weifang Lu ◽  
Abebe T. Tarekegne ◽  
Yiyu Ou ◽  
Satoshi Kamiyama ◽  
Haiyan Ou
Keyword(s):  
Surface Passivation ◽  
Surface States ◽  
Atomic Layer ◽  
Emission Peak ◽  
Photoelectron Spectra ◽  
Porous Structures ◽  
Temperature Dependent ◽  
Time Resolved ◽  
Pl Emission ◽  
Temperature Dependent Photoluminescence

Abstract A comprehensive study of surface passivation effect on porous fluorescent silicon carbide (SiC) was carried out to elucidate the luminescence properties by temperature dependent photoluminescence (PL) measurement. The porous structures were prepared using an anodic oxidation etching method and passivated by atomic layer deposited (ALD) Al2O3 films. An impressive enhancement of PL intensity was observed in porous SiC with ALD Al2O3, especially at low temperatures. At temperatures below 150 K, two prominent PL emission peaks located at 517 nm and 650 nm were observed. The broad emission peak at 517 nm was attributed to originate from the surface states in the porous structures, which was supported by X-ray photoelectron spectra characterization. The emission peak at 650 nm is due to donor-acceptor-pairs (DAP) recombination via nitrogen donors and boron-related double D-centers in fluorescent SiC substrates. The results of the present work suggest that the ALD Al2O3 films can effectively suppress the non-radiative recombination for the porous structures on fluorescent SiC. In addition, we provide the evidence based on the low-temperature time-resolved PL that the mechanism behind the PL emission in porous structures is mainly related to the transitions via surface states.

scholarly journals Excited state non-adiabatic dynamics of pyrrole: A time-resolved photoelectron spectroscopy and quantum dynamics study

2015 ◽  
Vol 142 (7) ◽  
pp. 074302 ◽  
Author(s):  
Guorong Wu ◽  
Simon P. Neville ◽  
Oliver Schalk ◽  
Taro Sekikawa ◽  
Michael N. R. Ashfold ◽  
...  
Keyword(s):  
Excited State ◽  
Photoelectron Spectroscopy ◽  
Quantum Dynamics ◽  
Time Resolved ◽  
Adiabatic Dynamics

scholarly journals Excited state non-adiabatic dynamics of N-methylpyrrole: A time-resolved photoelectron spectroscopy and quantum dynamics study

2016 ◽  
Vol 144 (1) ◽  
pp. 014309 ◽  
Author(s):  
Guorong Wu ◽  
Simon P. Neville ◽  
Oliver Schalk ◽  
Taro Sekikawa ◽  
Michael N. R. Ashfold ◽  
...  
Keyword(s):  
Excited State ◽  
Photoelectron Spectroscopy ◽  
Quantum Dynamics ◽  
Time Resolved ◽  
Adiabatic Dynamics

scholarly journals Modelling the effect of nuclear motion on the attosecond time-resolved photoelectron spectra of ethylene

2014 ◽  
Vol 47 (12) ◽  
pp. 124018 ◽  
Author(s):  
A Crawford-Uranga ◽  
U De Giovannini ◽  
D J Mowbray ◽  
S Kurth ◽  
A Rubio
Keyword(s):  
Photoelectron Spectra ◽  
Nuclear Motion ◽  
Time Resolved
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