Photoionization of environmentally polluting aromatic chlorides and nitrides on the water surface by laser and synchrotron radiations

The Analyst ◽  
2017 ◽  
Vol 142 (23) ◽  
pp. 4560-4569 ◽  
Author(s):  
Miki Sato ◽  
Yuki Maeda ◽  
Toshio Ishioka ◽  
Akira Harata
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Water Surface ◽  
Single Photon ◽  
Detection Limits ◽  
Single Photon Ionization ◽  
Two Photon ◽  
Polycyclic Aromatic ◽  
Photon Ionization

The detection limits and photoionization thresholds of polycyclic aromatic hydrocarbons and their chlorides and nitrides on the water surface are examined using laser two-photon ionization and single-photon ionization, respectively.

Detection of Polycyclic Aromatic Hydrocarbons in a Soil Sample with Photon Ionization Technique

2012 ◽  
Vol 271-272 ◽  
pp. 112-115
Author(s):  
A Dan Li ◽  
Min Zi Chen ◽  
Wen Feng Guo ◽  
Ralf Zimmermann
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Soil Sample ◽  
Aromatic Hydrocarbons ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Rare Gas ◽  
Line Measurement ◽  
Polycyclic Aromatic ◽  
On Line ◽  
Photon Ionization

An electron beam pumped rare gas excimer lamp (EBEL) was utilized to emit the intensive vacuum ultraviolet (VUV) radiation at 126 nm for soft single photon ionization (SPI) of polycyclic aromatic hydrocarbons (PAHs) in a soil sample. The VUV light source was coupled to a compact and mobile time-of-flight mass spectrometer (TOFMS) for the on-line measurement of PAHs. The moderate desorption temperature was set at 300 °C to guarantee the rapid evaporation of the PAHs in the soil sample and without decomposition from the larger molecules. With the thermal treatment, sample extraction and cleanup steps were not needed. The system developed herein was found to perform sufficiently well to evaluate the PAHs in the environmental soil sample at ppm level.

scholarly journals Subgap Two-Photon States in Polycyclic Aromatic Hydrocarbons: Evidence for Strong Electron Correlations

2014 ◽  
Vol 118 (6) ◽  
pp. 3331-3339 ◽  
Author(s):  
Karan Aryanpour ◽  
Adam Roberts ◽  
Arvinder Sandhu ◽  
Rajendra Rathore ◽  
Alok Shukla ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Electron Correlations ◽  
Strong Electron ◽  
Strong Electron Correlations ◽  
Two Photon ◽  
Polycyclic Aromatic ◽  
Photon States

scholarly journals Simulated and Experimental Time-Resolved Photoelectron Spectra of the Intersystem Crossing Dynamics in 2-Thiouracil

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2836 ◽  
Author(s):  
Sebastian Mai ◽  
Abed Mohamadzade ◽  
Philipp Marquetand ◽  
Leticia González ◽  
Susanne Ullrich
Keyword(s):  
Gas Phase ◽  
Single Photon ◽  
Photoelectron Spectra ◽  
Time Resolved ◽  
Single Photon Ionization ◽  
Biologically Relevant ◽  
Two Photon ◽  
Photon Ionization ◽  
Ionic States ◽  
Good Agreement

We report time-dependent photoelectron spectra recorded with a single-photon ionization setup and extensive simulations of the same spectra for the excited-state dynamics of 2-thiouracil (2TU) in the gas phase. We find that single-photon ionization produces very similar results as two-photon ionization, showing that the probe process does not have a strong influence on the measured dynamics. The good agreement between the single-photon ionization experiments and the simulations shows that the norms of Dyson orbitals allow for qualitatively describing the ionization probabilities of 2TU. This reasonable performance of Dyson norms is attributed to the particular electronic structure of 2TU, where all important neutral and ionic states involve similar orbital transitions and thus the shape of the Dyson orbitals do not strongly depend on the initial neutral and final ionic state. We argue that similar situations should also occur in other biologically relevant thio-nucleobases, and that the time-resolved photoelectron spectra of these bases could therefore be adequately modeled with the techniques employed here.

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