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  • 1990-1994  (30)
  • 1935-1939  (10)
  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a novel electrode structure for electric-field ionization of Rydberg atoms in a fast atomic beam is described. It allows the resolution of the ion signal from Rydberg atoms with adjacent effective principal quantum numbers n* in the range of 14≤n*≤40 and minimizes the volume where field ionization takes place. These features drastically reduce the number of background events arising from collisions of fast atoms with residual gas molecules and thus are essential for trace analysis applications of the technique of resonance ionization spectroscopy in collinear geometry.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1055-1058 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new excitation/detection scheme for Fourier-transform–ion-cyclotron-resonance (FT-ICR) studies is described. The ions are created in the center of a hyperbolic Penning trap and excited to a large magnetron radius. Parametric-mode excitation is used to drive the cyclotron motion. The ions are detected in the conventional dipole-mode detection scheme by use of a segmented ring electrode. Since the resonance frequencies of excitation (ν+−ν−) and detection (ν+, the reduced cyclotron frequency) differ by the magnetron frequency (ν−), this method allows the simultaneous excitation and detection of the ion motion.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Laser resonance ionization has been applied to ionize radioactive atoms released from thick ISOLDE/CERN targets. Laser light from pulsed dye lasers with a high repetition rate (10 kHz) was used for stepwise excitation and ionization. By this method, efficiency as well as the selectivity of the target/ion source system could be improved. In a series of off-line and on-line studies, the resonance ionization of elements with different ionization potentials, such as Yb (Ei=6.2 eV), Tm (Ei=5.8 eV) and Sn (Ei=7.3 eV), was investigated. For Yb, photoionization efficiencies of up to 15% have been measured. An efficiency of 0.2% was obtained for Sn at the on-line separator ISOLDE-3. However, this value can be improved by about two orders of magnitude using a transition to an autoionizing state at 59 375.9 cm−1.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 71 (1936), S. 232-245 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 76 (1938), S. 321-337 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfassung Mit quecksilbergebeiztem Getreide wurden am Kaninchen, Huhn und Meerschweinchen Fütterungsversuche durchgeführt, welche zu dem Ergebnis führten, daß erst die langdauernde regelmäßige Verfütterung von verhältnismäßig großen Mengen gesundheitszerstörend wirkten. Kleine Dosen, welche etwa den hundertsten Teil der tödlich erkannten Menge betrugen, riefen größere Schädigungen auch im Fortpflanzungsversuch nicht hervor. Mit Hilfe einer eigens ausgearbeiteten Destillationsmethode zur quantitativen Bestimmung kleinster Quecksilbermengen wurden die Organe Leber und Niere der Versuchstiere quantitativ auf Quecksilber untersucht. Die gefundenen Werte lagen bei den vergifteten Tieren außerordentlich viel höher als bei den gesunden Tieren und können in ihrer Größenordnung gewisse Anhaltspunkte für die Beurteilung abgeben, ob eine chronische Quecksilbervergiftung vorliegt, oder nur die normalerweise vorkommenden Quecksilberspuren.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 78 (1939), S. 449-458 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfassung Die neue Methode der Alkoholbestimmung in abgemessenem Blutserum beruht auf der Überführung des Alkohols in den krystallisierbaren, chemisch eindeutig definierten Dinitrobenzoesäureäthylester. Zum qualitativen Nachweis kann dieser Ester isoliert und dem Gericht als Beweismittel vorgelegt werden. Die quantitative Bestimmung erfolgt durch Verseifung des Esters und Oxydation des abgespaltenen Alkohols mit eingestellter Kaliumbichromatlösung in der von Liebesny bzw. Heiduschka vorgeschlagenen Apparatur. Die durch Reduktion verbrauchte Menge Kaliumbichromat wird mittels Titration mit n/15-Thiosulfatlösung ermittelt. Aus dem Reduktionswert wird der Alkohol berechnet. Die Methode ist spezifisch, da der ermittelte Alkohol nur dem Ester entstammen kann und andere flüchtige reduzierende Stoffe bei der Methode ausgeschaltet werden. Da die neue Methode im Vergleich zu den Methoden von Widmark und Liebesny schwierig und langdauernd ist, wird sie hauptsächlich in den Fällen anzuwenden sein, wo die an sich unspezifischen Methoden von Widmark und Liebesny Alkoholwerte berechnen lassen, welche im Widerspruch zu der ärztlichen Diagnose über den tatsächlichen Grad der Alkoholbeeinflussung stehen, d. h. den Verdacht erwecken, daß hier noch andere flüchtige reduzierende Stoffe Alkohol vorgetäuscht haben. Mit der neuen Methode ist die Möglichkeit gegeben, jeden Zweifel an der Richtigkeit und Spezifität des Resultates auszuschalten. Vergleichende Untersuchungen mit Blutseren nach den genannten drei Methoden haben eine gute Übereinstimmung der Resultate ergeben. Die Untersuchungen in dieser Richtung werden fortgesetzt.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 71 (1936), S. 405-410 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0649
    Keywords: 07.77 ; 07.80 ; 32.80 F ; 14.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report here on the development of a high-temperature laser ion source useful for trace analysis and other applications. It consists of a high temperature ionization chamber, three tunable dye lasers pumped by copper vapor lasers for stepwise resonant ionization and a Mattauch-Herzog mass spectrometer for the analysis of photo-ions. The principle of the laser ion source and its theoretical efficiency are discussed, where the efficiency of a laser ion source is the ratio of photo-ions extracted out to the number of atoms introduced into the cavity. Experimentally, an efficiency of 2×10−3 has been achieved for technetium. The scheme of gated detection is described which is used for suppressing isobaric background of molybdenum. The possible improvements are briefly mentioned for achieving isotopic analysis of 108 atoms of 97,98Tc in the presence of 1015 atoms of molybdenum, as separated chemically from molybdenum ore. Such an analysis of technetium isotopes produced in molybdenite ore by a (v,e −) reaction, is expected to yield information about the solar neutrino flux.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 340 (1991), S. 109-110 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The very neutron deficient nucleus 104Sn has been identified in in-beam spectroscopy using the reaction50Cr(58Ni, 2p2n) and neutron and charged particle multiplicity filter detectors. Excited states up to I ≈ 10 and Ex=4 MeV were observed and the level scheme is discussed in the frame work of the spherical shell model.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 336 (1990), S. 113-114 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A superdeformed band was observed in194Pb in a spectroscopic investigation with the OSIRIS array. The dynamic moment of inertiaJ (2) is very similar to the ones observed for superdeformed bands in192Hg and194Hg. This suggests that the high-N intruder configuration π64 ν74 determines the properties of the superdeformed core also in194Pb.
    Type of Medium: Electronic Resource
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