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 Time-Resolved Photoelectron Spectra ofCS2: Dynamics at Conical Intersections

2014 ◽  
Vol 112 (11) ◽  
Author(s):  
Kwanghsi Wang ◽  
Vincent McKoy ◽  
Paul Hockett ◽  
Michael S. Schuurman
Keyword(s):  
Photoelectron Spectra ◽  
Conical Intersections ◽  
Time Resolved

Probing ultrafast dynamics during and after passing through conical intersections

2019 ◽  
Vol 21 (26) ◽  
pp. 13902-13905 ◽  
Author(s):  
Shunsuke Adachi ◽  
Tom Schatteburg ◽  
Alexander Humeniuk ◽  
Roland Mitrić ◽  
Toshinori Suzuki
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ultrafast Dynamics ◽  
Conical Intersections ◽  
Time Resolved ◽  
Vacuum Uv

Time-resolved photoelectron spectroscopy using vacuum-UV probe pulses enables observing ultrafast dynamics during and after passing through conical intersections.

scholarly journals Time-resolved photoelectron imaging using a femtosecond UV laser and a VUV free-electron laser

2010 ◽  
Vol 81 (3) ◽  
Author(s):  
S. Y. Liu ◽  
Y. Ogi ◽  
T. Fuji ◽  
K. Nishizawa ◽  
T. Horio ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Uv Laser ◽  
Photoelectron Imaging ◽  
Time Resolved

Gas-Phase Tautomerism in the Triazoles and Tetrazoles: A Study by Photoelectron Spectroscopy and ab Initio Molecular Orbital Calculations

1981 ◽  
Vol 36 (11) ◽  
pp. 1246-1252 ◽  
Author(s):  
Michael H. Palmer ◽  
Isobel Simpson ◽  
J. Ross Wheeler
Keyword(s):  
Ab Initio ◽  
Gas Phase ◽  
Molecular Orbital ◽  
Photoelectron Spectroscopy ◽  
Relative Stability ◽  
Photoelectron Spectra ◽  
Equilibrium Geometry ◽  
Molecular Orbital Calculations ◽  
Methyl Derivatives

The photoelectron spectra of the tautomeric 1,2,3,- and 1,2,4-triazole and 1,2,3,4-tetrazole systems have been compared with the corresponding N-methyl derivatives. The dominant tautomers in the gas phase have been identified as 2 H-1,2,3-triazole, 1 H-1,2,4-triazole and 2H-tetrazole.Full optimisation of the equilibrium geometry by ab initio molecular orbital methods leads to the same conclusions, for relative stability of the tautomers in each of the triazoles, but the calculations wrongly predict the tetrazole tautomerism.

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

Time-Resolved Surface Temperature Measurement of MALDI Matrices under Pulsed UV Laser Irradiation

2004 ◽  
Vol 108 (13) ◽  
pp. 2405-2410 ◽  
Author(s):  
Antonis Koubenakis ◽  
Vladimir Frankevich ◽  
Juan Zhang ◽  
Renato Zenobi
Keyword(s):  
Surface Temperature ◽  
Temperature Measurement ◽  
Laser Irradiation ◽  
Uv Laser ◽  
Time Resolved ◽  
Surface Temperature Measurement
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