Effect of the Methyl Substitution on the Combustion of Two Methylheptane Isomers: Flame Chemistry Using Vacuum-Ultraviolet (VUV) Photoionization Mass Spectrometry

2015 ◽  
Vol 29 (4) ◽  
pp. 2696-2708 ◽  
Author(s):  
Hatem Selim ◽  
Samah Y. Mohamed ◽  
Arnas Lucassen ◽  
Nils Hansen ◽  
S. Mani Sarathy
Keyword(s):  
Mass Spectrometry ◽  
Vacuum Ultraviolet ◽  
Methyl Substitution ◽  
Photoionization Mass Spectrometry ◽  
Vuv Photoionization ◽  
Flame Chemistry

Vacuum ultraviolet photochemistry of the conformers of the ethyl peroxy radical

2021 ◽  
Vol 23 (38) ◽  
pp. 22096-22102
Author(s):  
Zuoying Wen ◽  
Xiaoxiao Lin ◽  
Xiaofeng Tang ◽  
Bo Long ◽  
Chengcheng Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Vacuum Ultraviolet ◽  
Theoretical Calculations ◽  
Peroxy Radical ◽  
Photoionization Mass Spectrometry ◽  
Condon Factors ◽  
Vuv Photoionization ◽  
Franck Condon

C2H5O2 plus its gauche and trans conformers are studied using synchrotron-based VUV photoionization mass spectrometry and theoretical calculations, and it is found that the gauche conformer has favorable Franck–Condon factors in photoionization.

scholarly journals The Potential of Vacuum Ultraviolet Photoionization Mass Spectrometry in Monitoring Photofragmentation of Organometallics

1993 ◽  
Vol 13 (2) ◽  
pp. 113-119 ◽  
Author(s):  
S. Georgiou ◽  
E. Mastoraki ◽  
E. Raptakis ◽  
Z. Xenidi
Keyword(s):  
Molecular Beam ◽  
Vacuum Ultraviolet ◽  
Impact Ionization ◽  
Microwave Discharge ◽  
Fragmentation Pattern ◽  
Photoionization Mass Spectrometry ◽  
Vuv Photoionization ◽  
Ionic Fragmentation ◽  
Deposition Processes ◽  
Fragmentation Patterns

The paper examines the potential of vacuum ultraviolet (VUV) photoionization mass spectroscopy in probing the fragmentation of organometallics in molecular-beam studies and laser-assisted deposition processes. To this end, the ionic fragmentation pattern of few common organometallics, namely metallocenes and carbonyls, is examined at selected VUV wavelengths, produced by microwave-discharge resonance atomic lamps. Discussion of the recorded spectra in terms of the electronic structure of the compounds indicates lack of dynamical bias in the VUV photoionization/fragmentation of metal complexes. Excitation with VUV light results in simpler ionic fragmentation patterns than what observed with electron-impact ionization, thereby enabling accurate monitoring of the excimer-laser photodissociation of organometallics. Finally, the intensity of the VUV ionic signal appears to be adequate for molecular-beam studies. An illustrative example is provided for the study of the 248nm-induced photodesorption of Mo(CO)6 from cryogenic films.

Progress in Fixed-Photon-Energy Time-Efficient Double Imaging Photoelectron/Photoion Coincidence Measurements in Quantitative Flame Analysis

2016 ◽  
Vol 230 (8) ◽  
Author(s):  
Daniel Felsmann ◽  
Arnas Lucassen ◽  
Julia Krüger ◽  
Christian Hemken ◽  
Luc-Sy Tran ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Synchrotron Radiation ◽  
Photon Energy ◽  
Molecular Beam ◽  
Vacuum Ultraviolet ◽  
Photoelectron Spectra ◽  
Combustion Analysis ◽  
Molecular Beam Mass Spectrometry ◽  
Vuv Photoionization ◽  
Coincidence Measurements

AbstractPhotoelectron photoion coincidence (PEPICO) spectroscopy as an attractive new technique for combustion analysis was used in a fixed-photon-energy configuration to provide quantitative species profiles in laminar premixed flames. While such measurements are conventionally performed with molecular-beam mass spectrometry (MBMS) using electron ionization (EI) or vacuum ultraviolet (VUV) photoionization (PI) with synchrotron radiation, these techniques have some limitations. The possibility to record photoelectron spectra (PES) simultaneously with photoionization data, providing fingerprint information for reliable species identification, presents a significant advantage of PEPICO spectroscopy especially in complex reactive mixtures. The multiplex approach presented here, enhanced by the imaging capabilities of the electron and ion detection in the so-called double-imaging PEPICO scheme (i

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