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  • 1
    Electronic Resource
    Electronic Resource
    Observation of the spatiotemporal dynamics of ionization wave mode transitions (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 833-835 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental observation of transitions between discrete longitudinal wave modes in a dc neon glow discharge is reported. Experimental findings concerning the pattern selecting instability agree with observations of the Eckhaus instability in fluid systems. This is supported by theoretical considerations of a model equation (Complex Ginzburg–Landau equation) based on a fluid model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873089
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  • 2
    Electronic Resource
    Electronic Resource
    Electron impact ionization of the SO2 molecule (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 211-218 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report measurements of the absolute cross sections for the electron-impact ionization of SO2 from threshold to 200 eV. Absolute cross sections for the formation of the SO+2 parent ions and of the SO+, S+, O+, and O+2 fragment ions were obtained independently in two different laboratories using two different experimental techniques with uncertainties ranging from ±18% to ±25%. The level of agreement between the absolute cross sections (at 70 eV) obtained by the two techniques ranges from about 10% for SO+2 and SO+ to 20% for (S++O+2) and O+, which in all cases is well within the combined error margins of the two measurements. The high resolution capability of the mass spectrometer employed in one experiment enabled the separation of the S+ and O+2 fragment ions, which are separated by only 0.017 76 atomic mass units (amu), for the first time. The single positive ion formation is the dominant process for all observed product ions. The total single SO2 ionization cross section obtained by the two techniques agreed to within 8%. A comparison of the experimentally determined total SO2 single ionization cross sections with calculated cross sections based on a modified additivity rule revealed agreement to within 20%. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469634
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  • 3
    Electronic Resource
    Electronic Resource
    Electron-impact ionization of the SO free radical (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 770-773 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We studied the electron-impact ionization of the SO free radical using the fast-neutral-beam technique. Absolute cross sections were measured for the formation of the SO+ parent ion as well as for the S+ and O+ fragment ions from threshold to 200 eV. At 70 eV, cross section values of 3.25±0.50×10−20 m2 (SO+), 1.32±0.23×10−20 m2 (S+), and 0.45±0.08×10−20 m2 (O+) were obtained. We found little evidence of the presence of vibrationally excited SO radicals in the incident target beams and only negligible contributions to the measured ion signal from excited SO radicals in Rydberg and/or metastable states were observed. The only significant pathway contributing to the formation of the observed SO+, S+, and O+ ions is the single positive ion formation. The measured partial ionization cross sections were combined to yield the absolute total single ionization cross section of SO which was compared to calculations using a recently introduced modified additivity rule. The agreement between measured and calculated cross sections was found to be very good. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469190
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute partial and total cross-section functions for the electron impact ionization of C60 and C70 (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 1880-1896 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron impact ionization of C60 and C70 was studied using a molecular/electron beam ion source in combination with a two sector field mass spectrometer operated in the ion beam deflection mode. Relative partial ionization cross sections for the production of singly and multiply charged parent ions (up to charge state z=4) and fragment ions (down to C+44 in the case of C60 and down to C2+50 in the case of C70) were determined from threshold up to 1000 eV electron energy. Absolute partial and total ionization cross sections are obtained using a novel approach for the absolute calibration involving an intercomparison of the cation with the anion yield. The results obtained reveal not only an anomalous large parent ion cross section as compared to other ionization channels [e.g., σ(C+60/C60) is more than a factor of 30 larger than σ(C+58/C60)] but also anomalies for the production of multiply charged parent and fragment ions. For instance, the maximum cross section for the formation of C2+60 amounts to 30% of the maximum C+60 cross section and that of C2+70 to about 50% of C+70. Moreover, for all fragment ions, the formation of the doubly charged fragment ions has a larger cross section than that of the respective singly charged fragment ion. These peculiar features of the kinetics of electron impact ionization of C60 and C70 are related to the specific electronic and geometric structures of these fullerenes. The present absolute cross-section data for the summed up partial cross sections are in good agreement with a recent semiclassical calculation from our laboratory. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472059
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  • 5
    Electronic Resource
    Electronic Resource
    Electron impact ionization of the SiDx (x=1–3) free radicals (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 6315-6321 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report measurements of absolute cross sections for the electron-impact ionization and dissociative ionization of the SiDx (x=1–3) free radicals from threshold to 200 eV using the fast-neutral-beam technique. The deuterated rather than the protonated target species were used in order to allow a better separation of the various product ions from a given parent in our apparatus. A common feature of all three radicals studied in this work is a dominant parent ionization cross section with essentially the same absolute value of roughly 3.7×10−16 cm2 at 70 eV. Dissociative ionization processes for all three targets are less significant with a single dissociative process dominating in each case, viz. the removal of a single D atom (SiDx+e−→SiD+x−1+D+2e−). The cross section for this dominant dissociative ionization channel also had the same maximum value of about 1.2×10−16 cm2 for all three targets. A comparison of the experimentally determined total single ionization cross sections with calculated cross sections using a modified additivity rule showed good to satisfactory agreement for all three targets in terms of the absolute values, but reveals some discrepancies in the cross section shapes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472484
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical determination of the absolute electron impact ionization cross-section function for silver clusters Agn (n=2–7) (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 1964-1971 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A recently developed semiclassical approach (DM formalism) was used to calculate the absolute total electron-impact single ionization cross sections for silver clusters Agn (n=2–7) from threshold to 1000 eV. Similar to other cluster properties, a clear odd–even effect has been observed for the calculated cross sections and is ascribed to the effective electron numbers in the valence shell. The only available experimental data for comparison are partial cross sections for the production of the singly charged parent ions for the monomer up to the tetramer. No experimental data are available as yet for any larger clusters nor for the total ionization cross sections. Nevertheless, a comparison of the results of the present calculations with calculations using additivity rules applied to molecules and clusters gives valuable insight into the ionization behavior of clusters as a function of cluster size and thus elucidates the transition from a molecular-type situation where the cross sections of the constituents are additive to a cluster-type situation where geometric effects lead to a n2/3-dependence in the limit of large cluster sizes n. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479464
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  • 7
    Electronic Resource
    Electronic Resource
    A case of thrombotic thrombocytopenic purpura in an adult treated with vincristine (1999)
    Springer
    Annals of hematology 78 (1999), S. 39-42 
    Details
    ISSN: 1432-0584
    Keywords: Key words Thrombotic thrombocytopenic purpura ; Plasma exchange ; Vincristine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The case of a woman with thrombotic thrombocytopenic purpura refractory to prolonged treatment with plasma exchange and steroid treatment is described. The addition of vincristine yielded a complete response, which has been maintained for 9 months up to the time of this report.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002770050471
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  • 8
    Electronic Resource
    Electronic Resource
    33jährige Patientin mit postpartalem Myokardinfarkt (1997)
    Springer
    Der Internist 38 (1997), S. 602-605 
    Details
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Myokardinfarkt ; Vasospasmus ; Ergotismus ; Postpartalphase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Eine 33jährige Patientin entwickelte am 6. postpartalen Tag eine kardiale Symptomatik mit den Zeichen eines akuten Vorderwandinfarktes. Als Ursache wurde ein durch Ergotamin induzierter Vasospasmus mit konsekutiver Thrombusbildung im R. interventricularis anterior festgestellt. Die Therapie bestand in einer intrakoronaren Lysetherapie sowie einem Absetzen der Ergotaminmedikation. Bei akuten ischämischen Syndromen sollte neben organischen Gefäßstenosen auch an funktionelle Veränderungen wie durch Ergotamin induzierte Vasospasmen gedacht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001080050072
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  • 9
    Electronic Resource
    Electronic Resource
    One-dimensional description of the anode region in a DC glow discharge (1998)
    Springer
    Czechoslovak journal of physics 48 (1998), S. 1167-1179 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transition region between the anode and the positive column of a glow discharge (anode fall) is investigated. A one-dimensional stationary description based on a fluid model of the plasma including the anode region is proposed. The results are compared with density profiles of excited state atoms in a neon discharge (pr 0 = 1.5 Torr cm, i/r 0=1.6mA cm−1). It was found that the knowledge of the electric field on the anode is sufficient for the description presented here. The electric field was derived from a surface charge on the anode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022806017423
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