scholarly journals Photophysics of indole upon X-ray absorption

2018 ◽  
Vol 20 (30) ◽  
pp. 20205-20216 ◽  
Author(s):  
Thomas Kierspel ◽  
Cédric Bomme ◽  
Michele Di Fraia ◽  
Joss Wiese ◽  
Denis Anielski ◽  
...  
Keyword(s):  
Gas Phase ◽  
Photon Energy ◽  
Single Photon ◽  
X Ray ◽  
Single Photon Ionization ◽  
Photon Ionization ◽  
X Ray Absorption

A photofragmentation study of gas-phase indole (C8H7N) upon single-photon ionization at a photon energy of 420 eV is presented.

scholarly journals Single photon ionization of hydrogen bonded clusters with a soft x-ray laser: (HCOOH)x and (HCOOH)y(H2O)z

2007 ◽  
Vol 126 (24) ◽  
pp. 244301 ◽  
Author(s):  
S. Heinbuch ◽  
F. Dong ◽  
J. J. Rocca ◽  
E. R. Bernstein
Keyword(s):  
Single Photon ◽  
X Ray ◽  
Single Photon Ionization ◽  
Photon Ionization ◽  
Hydrogen Bonded

scholarly journals Single photon ionization of van der Waals clusters with a soft x-ray laser: (SO2)n and (SO2)n(H2O)m

2006 ◽  
Vol 125 (15) ◽  
pp. 154317 ◽  
Author(s):  
F. Dong ◽  
S. Heinbuch ◽  
J. J. Rocca ◽  
E. R. Bernstein
Keyword(s):  
Single Photon ◽  
Van Der Waals ◽  
Van Der Waals Clusters ◽  
X Ray ◽  
Single Photon Ionization ◽  
Photon Ionization

Threshold photoelectron spectroscopy of 9-methyl adenine: theory and experiment

2021 ◽  
Author(s):  
Khouloud Laamiri ◽  
Gustavo Adolfo Garcia ◽  
Laurent Nahon ◽  
Adel Ben Houria ◽  
Raimund Feifel ◽  
...  
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Theoretical Study ◽  
Single Photon ◽  
Free Rotation ◽  
Single Photon Ionization ◽  
Photon Ionization ◽  
Theory And Experiment

We present a combined experimental and theoretical study of single-photon ionization of 9-methyl adenine (9MA) in the gas phase. In addition to tautomerism, several rotamers due to the free rotation...

An overview of organic molecule soft ionization using vacuum ultraviolet laser radiation

2005 ◽  
Vol 83 (11) ◽  
pp. 1891-1902 ◽  
Author(s):  
Y J Shi ◽  
R H Lipson
Keyword(s):  
Mass Spectrometry ◽  
Photon Energy ◽  
Organic Molecule ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Ultraviolet Laser ◽  
Single Photon Ionization ◽  
Soft Ionization ◽  
Photon Ionization ◽  
Tof Ms

The utility of coherent vacuum ultraviolet (VUV) single-photon ionization (SPI) combined with time-of-flight mass spectrometry (TOF-MS) for organic molecule detection by parent mass is explored in this short review. Nonresonant tripling in phase-matched Xe–Ar gas mixtures was used to generate photons at a fixed energy of 10.5 eV. Representative organic molecules with different functional groups were examined, including aliphatic and aromatic alkanes, alkenes, alkynes, alkanols, ethers, amines, aldehydes, ketones, carboxylic acids, and esters. In almost every case, the intensity of the resultant parent molecular ion peak detected by TOF-MS was found to be superior to that obtained using 70 eV electron impact (EI), and comparable to that obtained with 12 eV EI. In those instances when fragmentation reactions did occur, the resultant ions were similar to those found using EI but with significantly reduced mass spectral intensities. It was still possible to establish one dominant fragmentation pathway that could be used for molecular identification even if the parent molecular ion was not the strongest feature in the spectrum, for example, in the case of alcohols, alcohol clusters, and alcohol–ether adducts. Several of the fragment ions were metastably broadened. Not surprisingly, their known appearance energies or estimated reaction enthalpies were very similar to the fixed photon energy used. The success of using VUV for organic molecule soft ionization is attributed to the low photon energy that removes predominantly a π- or non-bonding electron from the functionalized species. As most organic compounds have ionization potentials in the 10.5 eV region, this approach is expected to be near universal.Key words: vacuum ultraviolet laser, single photon ionization, organic molecule detection, soft-ionization, mass spectrometry.

Reactions of Sulfur Dioxide with Neutral Vanadium Oxide Clusters in the Gas Phase. II. Experimental Study Employing Single-Photon Ionization

2008 ◽  
Vol 112 (44) ◽  
pp. 11067-11077 ◽  
Author(s):  
Sheng-Gui He ◽  
Yan Xie ◽  
Feng Dong ◽  
Scott Heinbuch ◽  
Elena Jakubikova ◽  
...  
Keyword(s):  
Experimental Study ◽  
Sulfur Dioxide ◽  
Vanadium Oxide ◽  
Gas Phase ◽  
Phase Ii ◽  
Single Photon ◽  
Single Photon Ionization ◽  
Photon Ionization ◽  
Vanadium Oxide Clusters

On the iron oxide neutral cluster distribution in the gas phase. II. Detection through 118 nm single photon ionization

2004 ◽  
Vol 120 (9) ◽  
pp. 4157-4164 ◽  
Author(s):  
D. N. Shin ◽  
Y. Matsuda ◽  
E. R. Bernstein
Keyword(s):  
Iron Oxide ◽  
Gas Phase ◽  
Phase Ii ◽  
Single Photon ◽  
Neutral Cluster ◽  
Single Photon Ionization ◽  
Cluster Distribution ◽  
Photon Ionization

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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