Appearance potentials of ion fragments of iron pentacarbonyl

1978 ◽  
Vol 56 (20) ◽  
pp. 2607-2608 ◽  
Author(s):  
B. R. Conard ◽  
R. Sridhar
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Electron Energy ◽  
Iron Pentacarbonyl ◽  
Energy Calibration ◽  
Existing Data

The previously reported fragments and a new fragment, FeC2+, have been observed in the mass spectrum of iron pentacarbonyl. The electron impact appearance potentials for the minor fragments of Fe(CO)5 are (in eV): FeC3O2+, 18.2; FeC2O+, 20.2; FeC2+, 29.9; FeO+, 22.5; and Fe(CO)32+, 24.0. Electron energy calibration was carried out using existing data for the major fragments of Fe(CO)5.

Rearrangement Reactions in the Electron Impact Fragmentation of Isobutene

1974 ◽  
Vol 52 (9) ◽  
pp. 1813-1820 ◽  
Author(s):  
Margaret S.-H. Lin ◽  
Alex. G. Harrison
Keyword(s):  
Mass Spectrum ◽  
Internal Energy ◽  
Electron Impact ◽  
Electron Energy ◽  
Skeletal Isomerization ◽  
Molecular Ion ◽  
Impact Fragmentation ◽  
Rearrangement Reactions ◽  
Average Internal Energy

The detailed mass spectrum of isobutene has been examined using both D and 13C labelling. It is shown that at low average internal energies of the molecular ion complete randomization of hydrogens and of carbons occurs prior to fragmentation to form C3H5+. As the average internal energy of the molecular ion increases (by increasing the ionizing electron energy) the extent of both carbon and hydrogen randomization decreases. Carbon scrambling is complete in the molecular ion prior to fragmentation to form C2 ions under all conditions studied. The results are consistent with a skeletal isomerization of the isobutene molecular ion by a mechanism involving a series of 1,3 ring closures to form methylcyclopropane type ions.

Electron impact cross sections and spatial aspects of electron energy degradation in water vapor

1986 ◽  
Vol 30 (S20) ◽  
pp. 547-554 ◽  
Author(s):  
Dayashankar ◽  
Suk T. Suh ◽  
A. E. S. Green
Keyword(s):  
Water Vapor ◽  
Electron Impact ◽  
Electron Energy ◽  
Cross Sections ◽  
Energy Degradation

scholarly journals The Use of Synchrotron Radiation in the Energy Calibration of Astronomical Apparatus

1972 ◽  
Vol 14 ◽  
pp. 642-646
Author(s):  
G. A. Gurzadyan ◽  
J. B. Ohanesyan
Keyword(s):  
Thin Films ◽  
Synchrotron Radiation ◽  
Electron Energy ◽  
Electron Accelerator ◽  
Energy Calibration ◽  
Ideal Solution ◽  
X Rays ◽  
Special Equipment ◽  
Physics Institute ◽  
Wide Range

The problem of energy calibration of astrophysical apparatus is essential for every or almost every space experiment. The utilization of synchrotron radiation from an electronic accelerator should perhaps be taken as an ideal solution of this problem, if of course, such a possibility is available.Special equipment for the extraction of synchrotron radiation has been devised at the circular electron accelerator with a maximum electron energy of 6 GeV, in the Physics Institute of Erevan (Gurzadyan and Ohanesyan, 1972). The equipment is designed primarily for the energy calibration of astronomical apparatus operating in a vacuum and hard ultraviolet and X rays. However, the equipment can also be applied to a wide range of experiments relating to the physics of solids, crystallography, physics of thin films, X rays, etc.

scholarly journals Measurements of electron emission under electron impact on BN sample for incident electron energy between 10 eV and 1000 eV

2019 ◽  
Vol 127 (2) ◽  
pp. 23001 ◽  
Author(s):  
M. Villemant ◽  
M. Belhaj ◽  
P. Sarrailh ◽  
S. Dadouch ◽  
L. Garrigues ◽  
...  
Keyword(s):  
Electron Impact ◽  
Electron Energy ◽  
Electron Emission ◽  
Incident Electron ◽  
Incident Electron Energy

Electron Impact Mass Spectroscopy for Identification of Phencyclidine

1986 ◽  
Vol 69 (5) ◽  
pp. 814-820
Author(s):  
Charles C Clark
Keyword(s):  
Mass Spectrum ◽  
High Resolution ◽  
Electron Impact ◽  
Mass Spectroscopy ◽  
Phenyl Ring ◽  
Labeled Compounds ◽  
Electron Impact Mass ◽  
High Resolution Mass Spectroscopy ◽  
Impact Mass ◽  
Resolution Mass

Abstract The electron impact mass spectrum of phencyclidine (PCP) was studied using both deuterium-labeled analogs and high-resolution mass spectroscopy. The deuterium-labeled compounds used were d5.PCP having 5 deuterium atoms on the phenyl ring, d10.PCP having 10 deuterium atoms on the cyclohexyl ring, and d15.PCP having deuterium atoms on both the phenyl and cyclohexyl rings. The identities of some major fragments and some possible pathways for their formation are shown. Electron impact mass spectroscopy is shown to be a definitive test for the identification of PCP.

Mass spectral investigations on selenium compounds. II. The behaviour of meta-and para-substituted benzeneseleninic acids and of meta-nitrophenyl selenocyanate under electron impact

1982 ◽  
Vol 35 (7) ◽  
pp. 1365 ◽  
Author(s):  
A Benedetti ◽  
C Preti ◽  
L Tassi ◽  
G Tosi
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Electron Impact ◽  
Molecular Ions ◽  
Selenium Compounds ◽  
Molecular Ion ◽  
Mass Spectral ◽  
Low Intensity ◽  
Fragment Ions

Substituted benzeneseleninic acids of the type XC6H4SeO2H (X = m-Cl, p-Cl, m-Br, p-Br, p-Me, m-NO2, p-NO2) have been investigated by mass spectrometry. The fragmentation modes and the fragment ions are discussed and compared with those obtained from the mass spectrum of m-nitro-phenyl selenocyanate, O2NC6H4SeCN. Generally, as regards the acids, besides very weak peaks due to the molecular ions, a number of peaks at higher mass numbers and of greater intensity is observed; these peaks are in multiplets typical of the presence of two selenium atoms, and they correspond to the disubstituted diphenyl diselenides of the type XC6H4SeSeC6H4X. m-Nitrophenyl selenocyanate shows an intense molecular ion peak and the relative fragmentation, while the peak due to the diselenide is of very low intensity.

The isolation of 11-oxotetrahydrorhombifoline from Ormosia coutinhoi and a study of its mass spectrum

1967 ◽  
Vol 45 (7) ◽  
pp. 751-757 ◽  
Author(s):  
Stewart McLean ◽  
A. G. Harrison ◽  
D. G. Murray
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Mass Spectra ◽  
Equilibrium Theory ◽  
Side Chain ◽  
Fragmentation Reaction ◽  
Quasi Equilibrium ◽  
Molecular Ion ◽  
Dihydro Derivative ◽  
A Minor

11-Oxotetrahydrorhombifoline (I) has been isolated from the alkaloidal extract of the bark of Ormosia coutinhoi, and its dihydro derivative II has been prepared. An examination of the mass spectra of these compounds and of their 3,3-d2 derivatives has led to the elucidation of the course of the major electron impact induced fragmentations undergone by the molecules. The main fragmentation of I leads to loss of C3H5 from the side chain to form an ion of m/e 221, with a minor path involving a central fission of the molecular ion to form an ion of m/e 150. The mass spectrum of II shows that the loss of C3H7 to form the ion of m/e 221 is a minor process, the main fragmentation reaction involving a central fission to form an ion of m/e 152 analogous to the ion of m/e 150 from I. This change in the spectrum is shown to be consistent with predictions based on the quasi-equilibrium theory of mass spectra.

Energetics of the Ionization and Fragmentation of Phosphorus Trifluoride by Electron Impact

1975 ◽  
Vol 53 (6) ◽  
pp. 933-938 ◽  
Author(s):  
David F. Torgerson ◽  
John B. Westmore
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Ionization Efficiency ◽  
Negative Ion ◽  
Efficiency Curve ◽  
Group V ◽  
Fragmentation Pathways ◽  
Ion Fragmentation ◽  
Positive Ions ◽  
Significant Intensity

Relative intensities and appearance potentials of several positive ions in the mass spectrum of PF3 are reported as well as an ionization efficiency curve for F−, the only negative ion of significant intensity. Probable ion fragmentation pathways are proposed, together with heats of formation of some positive ions, and ionization potentials for PF3, PF2·, and PF. The results are compared with available data for other Group V halides.

Electron‐impact excitation of UF6 at an electron energy of 20 eV in the energy‐loss range of 0–10 eV

1976 ◽  
Vol 64 (11) ◽  
pp. 4791-4793 ◽  
Author(s):  
A. Chutjian ◽  
S. K. Srivastava ◽  
S. Trajmar ◽  
W. Williams ◽  
D. C. Cartwright
Keyword(s):  
Energy Loss ◽  
Electron Impact ◽  
Electron Energy ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Loss Range

Effect of Electron Energy on Some Electron‐Impact Processes

1961 ◽  
Vol 34 (6) ◽  
pp. 2046-2049 ◽  
Author(s):  
Seymour Meyerson
Keyword(s):  
Electron Impact ◽  
Electron Energy ◽  
Impact Processes
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