scholarly journals Flame structure of laminar premixed anisole flames investigated by photoionization mass spectrometry and photoelectron spectroscopy

2019 ◽  
Vol 37 (2) ◽  
pp. 1579-1587 ◽  
Author(s):  
Thomas Bierkandt ◽  
Patrick Hemberger ◽  
Patrick Oßwald ◽  
Dominik Krüger ◽  
Markus Köhler ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Flame Structure ◽  
Photoionization Mass Spectrometry

A study of the vacuum pyrolysis of 4-diazo-3-isochromanone with Hel ultraviolet photoelectron spectroscopy

1995 ◽  
Vol 73 (10) ◽  
pp. 1738-1740 ◽  
Author(s):  
N.H. Werstiuk ◽  
J. Ma ◽  
C.D. Roy ◽  
A.J. Kresge ◽  
E. Jefferson
Keyword(s):  
Mass Spectrometry ◽  
Heat Source ◽  
Photoelectron Spectroscopy ◽  
Laser Power ◽  
Ring Opening ◽  
Power Level ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Photoionization Mass Spectrometry ◽  
Cw Laser ◽  
Vacuum Pyrolysis

A newly developed ultraviolet photoelectron spectrometer – CO2 laser instrument that utilizes a 50-W CW laser as a directed heat source was used to study the vacuum pyrolysis of 4-diazo-3-isochromanone (1). Analysis of the pyrolysate with ultraviolet photoelectron spectroscopy and photoionization mass spectrometry established that 1 undergoes a facile, unexpected pyrolysis at a laser power level of 26 W yielding N2, CO, and benzocyclobutenone (6). A multistep mechanism beginning with the formation of 4-carbena-3-isochromanone (2), which rearranges to oxaketene 3, can be written for the reaction. If 3 is an intermediate, it must be unusually thermally labile for it readily decarbonylates to 2-carbena-3,4-benzotetrahydrofuran (4). The ring opening of 4 into the ortho-quininoid ketene 5 and the cyclization of 5 into 6 are possible final steps in the conversion of 1 into 6. Keywords: vacuum pyrolysis, 4-diazo-3-isochromanone, HeI ultraviolet photoelectron spectroscopy.

scholarly journals Zur Photoionisation und Ionenfragmentation von SF4/Photoionization and Ion Fragmentation of SF4

1989 ◽  
Vol 44 (1) ◽  
pp. 13-16 ◽  
Author(s):  
H.-W. Jochims ◽  
E. Rühl ◽  
H. Baumgärtel
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Theoretical Calculations ◽  
Ionization Potentials ◽  
Bond Dissociation Energies ◽  
Bond Dissociation ◽  
Photoionization Mass Spectrometry ◽  
Ion Fragmentation ◽  
Dissociation Energies

Abstract The ionization potentials of sulfurtetrafluoride have been measured using threshold photoelectron spectroscopy and com pared with theoretical calculations. The decay of SF4+ has been studied by photoionization mass spectrometry and photoion-photoelectron coincidence. The break-down graphs reveal competing decay processes. Bond dissociation energies in SF4+ have been calculated.

Understanding the Homogeneous Reactions of Primary Tar from Biomass Pyrolysis by Means of Photoionization Mass Spectrometry

2020 ◽  
Vol 34 (10) ◽  
pp. 12678-12687 ◽  
Author(s):  
Ke Yang ◽  
Jiahao Wang ◽  
Jiahui Huang ◽  
Jiuzhong Yang ◽  
Yang Pan ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Biomass Pyrolysis ◽  
Photoionization Mass Spectrometry ◽  
Homogeneous Reactions

Analysis of neonicotinoids from plant material by desorption atmospheric pressure photoionization-mass spectrometry

2015 ◽  
Vol 29 (5) ◽  
pp. 424-430 ◽  
Author(s):  
Anu Vaikkinen ◽  
Henning S. Schmidt ◽  
Iiro Kiiski ◽  
Sari Rämö ◽  
Kati Hakala ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Plant Material ◽  
Atmospheric Pressure Photoionization ◽  
Photoionization Mass Spectrometry
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