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  • 1
    Electronic Resource
    Electronic Resource
    Electronic and vibrational excitation of acrylonitrile by low and intermediate energy electrons (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 80-89 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electronic and vibrational excitation of acrylonitrile induced by 3–50 eV energy electrons has been investigated by the electron energy loss spectroscopy. Electronic excitation spectra have been recorded for 30 and 50 eV impact energies at a 10° scattering angle in the energy loss range from 5.5 to 11.5 eV, corresponding to the excitation of electrons belonging to the outermost-valence-shell molecular orbitals. We have reviewed the assignment of the valence excited states occurring in the 5.5–9 eV energy loss region. The vibrational patterns associated with the two lowest-energy singlet valence excited states have also been re-examined. Moreover, we have proceeded for the first time to the analysis and attribution of several Rydberg series converging to the ionic ground state and to its two lowest-energy electronic excited states. The study of the excitation function of the C—H stretching modes of acrylonitrile in the 3–11 eV electron impact energy range has shown evidence of a broad shape resonance built on the electronic ground state of the molecule and centered at 5.85 eV. This resonance contributes to a preferential excitation of the C—H stretching modes suggesting that the charge distribution of the additional electron is very likely that of a σ*(C—H) valence molecular orbital. A comparison has been made between the resonances observed in C2H4 and CH2CHCN, in order to discuss the symmetry of the resonant state and also to analyze the substitution effect of the cyanogen group. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469625
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  • 2
    Electronic Resource
    Electronic Resource
    High resolution electron energy loss spectroscopy of NH3 in the 5.5–11 eV energy range (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1797-1803 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New data have been obtained about the singlet excited states of ammonia in the 5.5–11 eV energy range by electron energy loss spectroscopy. The 50 eV excitation spectrum has been analyzed with high energy resolution (15 meV) at several scattering angles ranging from 4° to 40°. Some known vibrational progressions have been completed by new additional terms with high quantum numbers v'. The differential cross section for the five lowest energy singlet states have been measured at 50 eV impact energy as a function of the scattering angle. These data lead to discuss the classification of the Rydberg series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448413
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  • 3
    Electronic Resource
    Electronic Resource
    Vibrational excitation of methylamine by electron impact in the 4.5–30 eV energy range (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7314-7322 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational excitation of gaseous methylamine induced by 4.5–30 eV energy electrons has been investigated by the electron energy loss spectroscopy. The ratios of the differential cross sections for excitation of the vibrational modes and for elastic scattering measured as a function of the electron kinetic energies show that at 15 and 30 eV, the vibrational excitation occurs mainly through a direct mechanism. The absolute vibrationally elastic and inelastic differential cross sections have been measured at these impact energies. The cross sections for the inelastic scattering are strongly dependent on the vibrational mode which is excited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463503
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  • 4
    Electronic Resource
    Electronic Resource
    Fragmentation of the hexafluorobenzene dication formed by photoabsorption in the 30–120 eV energy range (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 1931-1941 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociation pattern of the doubly charged C6F2+6 ion produced by single photon ionization has been investigated in the 27–120 eV energy range using time-of-flight (TOF) mass spectrometry, double photoion–photoion coincidence (PIPICO), and triple photoelectron–photoion–photoion coincidence (PEPIPICO) spectroscopies. A "metastable'' C6F2+6 ion is observed with an appearance energy of 27.3±0.4 eV dissociating slowly to the lowest thermodynamical limit leading to the ion pair products CF++C5F+5 (appearance energy of 30.7±0.5 eV). At higher energies, several other charge separation reactions appear as well as covalent channels in which neutral fragments are ejected from C6F2+6. Additional pairs of correlated ions are formed by secondary fragmentations. In the threshold region, double ionization of the molecule is probably followed by structural rearrangements to distinct C6F2+6 isomers, each dissociating to specific dissociation channels. Partial cross sections of selected ion pairs measured in the 30–120 eV photon energy region exhibit strong resonances suggesting that a rather large part of double ionization is an indirect phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462094
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  • 5
    Electronic Resource
    Electronic Resource
    Resonant vibrational excitation of methylamine by low energy electron impact (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7843-7850 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The study of the excitation functions of the NH2 and CH3 stretching modes of methylamine in the 4–12 eV electron impact energy range shows evidence of a broad shape resonance built on the electronic ground state and centered at 7.5 eV. This resonance is formed by the trapping of the incident electron in the second unoccupied molecular orbital and is of A‘ symmetry. The elastic and inelastic angular differential cross sections measured in the 10°–90° range suggest a dominant p character. A second shape resonance located at higher energy contributes mainly to the enhancement of the CH3 deformation modes and is very likely of A' symmetry. A comparison is made between the resonances observed in NH3 and CH3NH2. The effect of the methyl substitution is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459366
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  • 6
    Electronic Resource
    Electronic Resource
    Absolute vibrational differential cross sections of water vapor by 30 and 50 eV electron impact (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1671-1675 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Direct vibrational excitation of water vapor has been investigated by use of electron impact spectroscopy. Absolute vibrational differential cross sections have been measured for the bending (010) and stretching (100,001) modes of the electronic ground state at 30 and 50 eV impact energies and in the angular range from 10° to 60°. Our experimental data are compared to theoretical results available in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461018
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  • 7
    Electronic Resource
    Electronic Resource
    Electron-impact excitation of the normal vibrational modes of NH3 in the intermediate region (12–50 eV) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 213-219 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron-impact excitation of the normal vibrational modes of NH3 in its ground electronic state has been studied by electron-energy-loss spectroscopy in the 12–50 eV impact energy range out of resonances. At 25 and 50 eV the differential cross sections (in arbitrary units) for the elastic scattering process and for the vibrationally inelastic v=0→1 transitions have been measured at various scattering angles ranging from 8° to 60°. The ratio of the vibrational differential cross sections to the elastic one, reported as a function of the impact energy, indicates that for energies above 10 eV, the vibrational excitation occurs mainly through a direct mechanism. At 50 eV the angular shape of the cross sections is strongly dependent on the specific normal mode excited. The ν2 differential cross section is forward peaked, whereas that of ν4 is isotropic. The differential cross section of ν1,3 composite has a minimum at 30°. At 25 eV the angular behavior of the differential cross sections is roughly similar for all the normal modes with a minimum at 30°, but the values (in arbitrary units) below and above 30° are quite different for each normal mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458465
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  • 8
    Electronic Resource
    Electronic Resource
    Towards high-resolution spectroscopy and dynamics studies in complex multi-ionized molecules : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2182-2185 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: New experimental developments for high-resolution spectroscopy and dynamics studies of complex multi-ionized molecules are presented. Using photoion-photoion coincidence measurements in the doubly ionized C6F6 (hexafluorobenzene) molecule obtained with a conventional time-of-flight spectrometer and the ACO storage ring as an example, we demonstrate the importance of improving (i) the light source by using the new storage ring Super-ACO, (ii) the detection mode by using the photoelectron-photoion-photoion coincidence method, and (iii) the mass resolution of the spectrometer by constructing a reflectron time-of-flight mass spectrometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140816
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  • 9
    Electronic Resource
    Electronic Resource
    Fragmentation of methyl chloride photoexcited near Cl (2p) by mass spectrometry (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 7548-7553 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The evolution of the fragmentation pathways of the methylchloride around the Cl 2p edge has been studied by use of charge separation mass spectrometry. Some fragmentation patterns are discussed in the frame of rapid fragmentation of the neutral and dissociation pathways characteristic of singly or multiply charged species. The correlation of the evolution of the charge separation spectra with the initial excitation process is used to give a definitive attribution to the pre-edge features present in the absorption spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468249
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  • 10
    Electronic Resource
    Electronic Resource
    Inner-shell excitation of monocyanoethylene, trans-dicyanoethylene, and allylcyanide by electron energy loss spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 35-45 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Inner-shell excitation spectra of gaseous monocyanoethylene, trans-dicyanoethylene, and allylcyanide have been measured at C1s and N1s edges using 2 keV electron collisions in quasi-dipolar excitation conditions and the electron energy loss spectroscopy. The energy resolution has allowed the observation of transitions from different carbon sites. Ab initio calculations have been made to help the assignment of the experimental features. The spectra below the core-electron ionization limit have been interpreted in terms of transitions to the lowest-energy valence unoccupied molecular orbitals shown to be of π* type in each molecule. The effects of the conjugation between the multiple bonds on the spectra and on the splitting of the π* type molecular orbitals have been discussed. Strong electronic relaxation effects have been evidenced. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473200
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