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  • 1
    Electronic Resource
    Electronic Resource
    Helicon plasma sputtering system for fabrication of multilayer x-ray mirrors : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2141-2143 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A sputtering system which utilizes a pair of helicon plasma cathodes has been developed for the fabrication of multilayer x-ray mirrors. The helicon plasma cathode consists of a conventional dc magnetron cathode and a radio frequency coil for a helicon wave. Contamination of thin films fabricated with the system are examined using Rutherford backscattering spectroscopy and x-ray fluorescence analysis. W/C multilayers having 2d spacings of 28–63 A(ring) have been formed on Si substrates. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146458
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  • 2
    Electronic Resource
    Electronic Resource
    Asymmetry in the ionic fragmentation of N2O photoexcited around the N and O K edges (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4652-4661 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Asymmetry parameters (β) for the fragment ions of N2O following excitation or ionization of the N and O K shell electrons have been determined from photoelectron–photoion coincidence (PEPICO) and photoion–photoion coincidence (PIPICO) spectra measured using monochromatized synchrotron radiation and a rotatable time-of-flight mass spectrometer. Profiles of the β parameters from the N+ ions with low kinetic energies (K.E. 〈4.5 eV) in the PEPICO spectra were found to be very isotropic (close to 0) around both the N and O K edges. β parameter profiles for the O+ ions with contributions from N+ ions with K.E. (approximately-greater-than)4.5 eV and N2+ ions overlapped with NO+ ions show structure with negative values at the π* resonances below the N K-edges and positive values at the unresolved Rydberg resonances below the terminal N K edge and O K edge and at the shape resonance above the N K edges. β parameters from the N+–NO+ and N2+–O+ PIPICO signals were found to be considerably more anisotropic than the corresponding values from the PEPICO signals at the π* resonances below the N K edges and the shape resonance above the ionization edges. β parameters from both the PEPICO and PIPICO signals were close to zero at the π* resonance below the O K edge. The higher degree of anisotropy of ionic fragmentation observed in the PIPICO signals highlights the importance of measuring the fragmentation spectra of polyatomic molecules in coincidence in order to obtain accurate β parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464969
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation of O2 induced by selective K-shell excitation (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5329-5334 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dissociation of O2 stimulated by soft x-ray absorption has been studied by using a monochromatized synchrotron radiation and a time-of-flight mass spectrometer. The parent molecular ion O+2 was formed only at 531 eV (excitation of 1s→1πg), and a fragment ion O+ had the highest intensity in all the energies giving core–hole states. The measured time-of-flight spectra were reproduced by a simulation calculation, which provided kinetic energy distributions of O+ and O++. The dissociation pathways from the core–hole states of O2 were discussed using the obtained kinetic energy distribution and ion intensity ratios as well as Auger electron spectra in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457581
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic energy released in positive ion pair formation from inner-shell excited oxygen molecule (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4073-4076 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Total kinetic energy released in dissociation from inner-shell excited states of O2 induced by soft x-ray irradiation has been measured using a time-of-flight mass spectrometer operated in a photoion–photoion coincidence mode. The distribution of the total kinetic energy released in the dissociation into O++O+ at a photon energy above the 1s ionization threshold shows three peaks at about 6, 11, and 15 eV and that at an energy of the 1s→2pπg transition has a broad maximum at 11 eV. The total kinetic energy distribution of O++O2+ shows a broad maximum at about 20 eV in all the photon energies. The dissociation pathways are discussed in detail using the kinetic energy distributions obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458739
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  • 5
    Electronic Resource
    Electronic Resource
    Fragmentation of N2 in the inner-shell to Rydberg-orbital excited states (K)−1(nl)1 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5324-5328 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fragment ions from N2 in the states of (K)−1(nl)1 have been measured at 54.7° with respect to the polarization direction of the incident photon by using a time-of-flight (TOF) mass spectrometer. Simulation fitting calculation to the measured TOF spectra gave distributions of the kinetic energy for these ions. Ion yield spectra observed showed that no singly charged molecular ion was produced from the states of (K)−1(nl)1 in contrast to that of (K)−1(1πg)1. These results are discussed in connection to the dissociation pathway of N2 in these states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457580
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  • 6
    Electronic Resource
    Electronic Resource
    Angular distribution measurement of fragment ions from a molecule using a new beamline consisting of a Grasshopper monochromator : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2190-2192 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Optical characteristics of a new beamline consisting of a premirror, a Grasshopper monochromator, and a refocusing mirror have been investigated. The intensity of the monochromatic soft x-ray was estimated to be about 108 photons/(s 100 mA) at 500 eV with the storage electron energy of 600 MeV and the minimum slit width. This slit width provides a resolution of about 500. Angular distributions of fragment ions from an inner-shell excited nitrogen molecule have been measured with a rotatable time-of-flight mass spectrometer by using this beamline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140818
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  • 7
    Electronic Resource
    Electronic Resource
    Anisotropic dissociation of CO around the C K and O K ionization edges (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 393-401 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Asymmetry parameter values have been determined from the C+ and O+ signals in the time of flight mass spectra of CO excited and/or ionized with monochromatic synchrotron radiation around the C K and O K ionization edges using a rotatable time of flight mass spectrometer. Asymmetry parameter values of about −0.8 were obtained from the C+ and O+ ions at the positions of both the C1s−12π* and O1s−12π* resonances below the core edges. Positive values of about 0.5 were obtained at the positions of the σ shape resonances above the C and O K edges. The results are consistent with previous assignments of the symmetries of the final state orbitals for the pre-edge resonances and the symmetries of the outgoing channels which exhibit shape resonances above the C K and O K ionization edges. The results are also consistent with the recently reported symmetry resolved photoionization spectra of CO. Above the ionization edges, the experimental data shows good agreement with the molecular asymmetry parameter values calculated by the relaxed-core Hartree–Fock method. Effects of the relatively intense shake-up transitions accompanying C1s ionization on the asymmetry parameter values are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466953
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  • 8
    Electronic Resource
    Electronic Resource
    Verification of NEXAFS assignments by a comparison of fragmentation between gaseous and condensed methyl formate (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 548-550 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: According to the ion desorption from condensed methyl formate (DCOOCH3) by C 1s electron excitation, C+ yield was strongly enhanced at 289.1 eV, a higher energy side of C1s(DC) ⇒ π*(C=O) peak. This feature could not be clearly assigned. In this work, to clarify the feature, fragment-ion yield curves of gas-phase methyl formate were measured and compared with those of condensed one, since gas-phase and condensed systems are presumed to show more or less similar fragment-ion yield curves under similar excitations. The results demonstrate that fragment-ion yield curves are useful for the assignments of NEXAFS features in both gaseous and condensed polyatomic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049500017143
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  • 9
    Electronic Resource
    Electronic Resource
    Absolute soft X-ray measurements using an ion chamber (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 869-871 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Measurements of soft X-ray absolute intensities have been carried out using a double ion chamber and monochromated synchrotron radiation. The chamber is cylindrical and 1.3 m long. The soft X-ray beam enters the chamber at a position off the central axis, and the produced ions are collected with electrodes on the opposite side to the photon entrance. An index constant for rare gas, the γ-value, which is the average number of electrons emitted from an atom having absorbed a photon, was used for obtaining the absolute photon intensity. The obtained intensity ranges from 1 Gphotons s−1 to 25 Gphotons s−1 in the energy range 72–800 eV. The estimated uncertainty is about 5–20% depending on the intensity and the spectral purity of the soft X-rays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597017548
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  • 10
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    Asymmetry of Departing Fragment Ion in theK-Shell Excitation ofn2 (1988)
    American Physical Society
    Details
    Publication Date: 1988-12-12
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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