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  • Artikel: DFG Deutsche Nationallizenzen  (16)
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  • Artikel: DFG Deutsche Nationallizenzen  (16)
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  • 1
    Digitale Medien
    Digitale Medien
    Off-line coupling of a microbore high-performance liquid chromatograph to a secondary ion time-of-flight mass spectrometer (1990)
    s.l. : American Chemical Society
    Analytical chemistry 62 (1990), S. 1259-1264 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00212a009
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  • 2
    Digitale Medien
    Digitale Medien
    Comparison of mass spectra obtained with low-energy ion and high-energy californium-252 fission fragment bombardment (1981)
    s.l. : American Chemical Society
    Analytical chemistry 53 (1981), S. 1241-1244 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00231a024
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  • 3
    Digitale Medien
    Digitale Medien
    Comparison of relative quasi-molecular ion yields for 8-keV ion and 252Cf fission fragment bombardment (1988)
    s.l. : American Chemical Society
    Analytical chemistry 60 (1988), S. 1494-1498 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00166a004
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  • 4
    Digitale Medien
    Digitale Medien
    Attempt to detect X-ray Pulses from the Crab Nebula (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 149-150 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] During a balloon flight of a telescope on August 22, 1968, the X-ray spectrum from the Crab Nebula was measured in the energy interval 30 keV-120 keV, and the detector pulses were recorded on magnetic tape together with 1 kHz clock pulses from a crystal-controlled oscillator. The frequency of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/222149a0
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  • 5
    Digitale Medien
    Digitale Medien
    Coherent Scattering of 1.33 MeV. γ-Rays by Lead (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 521-523 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] We have measured the differential cross-sect ion for elastic scattering of 1-33 MeV. -rays from lead using a larger y-ray source than previous workers2, and using a different method4 of examining the scattered -ray spectrum. In this method a scintillating crystal is viewed by two photomultipliers 1 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/182521b0
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  • 6
    Digitale Medien
    Digitale Medien
    Recent events (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 361-363 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290040915
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  • 7
    Digitale Medien
    Digitale Medien
    Secondary-ion and electron production from surfaces bombarded by large polyatomic ions (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 147-157 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Heavy molecular ions with energies in the range 10-20 keV and masses from 276 u to 132 000 u, produced by matrix-assisted laser desorption, were used as primary projectiles to produce secondary-ion spectra from a variety of surfaces ina tandem time-of-fight mass spectrometer. In the negative mode the ratio of electron emission to secondary-ion emission was found to decrease rapidly with increasing projectile mass. Ion emission was found to dominate for primary ions larger than ∼ 10 000 u. Positive or negative molecular ions and cations were observed from several organic targets of masses up to 1140 u (gramicidin S) for incident projectiles up to mass 132 000 u, i. e., for projectile speeds down to ∼7000 m/s. Other ions characteristic of the target were also observed for these projectiles. Thus, large polyatomic ions can cause secondary-ion desorption even at very low velocity. The background ions of both polarities are similar to those found in keV particle bombardment by monatomic projectiles. The same ions are observed for all the projectiles; most can be identified with hydrocarbon background. The relative intensities of the background positive ions are largely independent of projectile, and for both polarities the ratio of the ions characterizing the target to those forming the background is approximately constant for all the projectiles. These results strongly suggest that the background ions come from the usual layer of organic impurities attached to the target surface. No direct evidence for surface-induced dissociation was observed in this mass and energy range.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290060215
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  • 8
    Digitale Medien
    Digitale Medien
    Properties of matrix-assisted laser desorption. Measurements with a time-to-digital converter (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 117-123 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Some properties of matrix-assisted laser desorptio have been studied using single-ion-counting methods and a time-to-digital converter. The methods allow examination of the process for irradiances near the reported threshold for observation with a transient recorder. All measurements were made using bovine insulin as a test compound. We presernt direct evidence that an irradiance threshold near 106 W cm-2 exists for ion production, and that the process in a collective effect, either involving a large number of molecular ions (∼104)in a successful event or none at all. Above the threshold, the yield is found to scale with a high power (4th to 6th) of the irradiance. Measurements of initial velocity distributions indicate an axial velocity spread corresponding to ∼50 eV and a radial velocity spread corresponding to ∼2.4 eV. Thus the ejection or extraction mechanism appears to be strongly asymmetric.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290050306
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  • 9
    Digitale Medien
    Digitale Medien
    Kinetic energy measurements of molecular ions ejected into an electric field by matrix-assisted laser desorption (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 671-678 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Measurements of kinetic energy distributions of molecular ions ejected into an extraction field by matrix-assisted laser desorpton re reported. The measurements were made in a time-of-flight mass spectrmeter with an electrostatic mirror by measuring the reflected signal as a function of the difference between the accelerating voltage and the voltage applied t the mirror. The molecular ions ere found to have less kinetic energy than the extraction field alone would normally provide, i.e. we observed an nergy deficit. Under conditons typical for a matrix-assisted laser desrptio experiment, the deficit is about 24 eV for oleclar ions of insulin. The size of the deficit increases with the intensity of the molecular ion signal, and the molecular weight of the protein; t is also larger for negative molecular ions than for positive molecular ions.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290061109
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  • 10
    Digitale Medien
    Digitale Medien
    Factors affecting the ultraviolet laser desorption of proteins (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 233-237 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The production of high-mass quasimolecular ions from proteins by matrix-assisted ultraviolet laser desorption is described. A simple time-of-fight system using a Q-switched frequency-quadrupled Nd-YAG laser to desorb protein molecules is shown to have a mass range of up to 116 000 u by the observation of intact, singly charged quasimolecular ions from 700 fmol of β-galactosidase subunit (mol.wt = 116 336 Da). Both positive- and negative-ion spectra of proteins are shown. Four new matrix materials, with properties as good as or better than nicotinic acid, are described. A mass resolution of approximately 500 (full width at half maximum definition) is demonstrated for proteins with mol.wt 〈 20 000 Da. Product species, formed by fast photochemical reactions in the matrix, are observed to form adduct ions with protein molecules. These adduct ions are a significant cause of the observed broadness of protein quasimolecular ion peaks. The practical physical considerations in detection of large-mass quasimolecular ions from laser desorption, such as detector overloading, are discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290030708
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