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  • Analytical Chemistry and Spectroscopy  (2)
  • 32.80  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Observations and analysis of resonant laser ablation of GaAs (1991)
    Springer
    Applied physics 53 (1991), S. 34-38 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.80 ; 32.90+1 ; 79.20.Ds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser ablation of solid GaAs samples has been studied using one tunable pulsed dye laser. At relatively low laser power, enhancements of up to several hundred times have been observed in the yield of resonantly ionised Ga using laser wavelengths corresponding to the atomic transition 42 P 1/2-42 D 3/2. The influences of laser power and target geometry, on the ion yield and spectral profile, are discussed. It is argued that the resonant excitation and ionisation processes occur in the gas phase of the atoms ablated from the sample surface, and the observed asymmetric spectral profile results from laser-induced collisional processes, e.g., optical collisions, under conditions of relatively high atomic density in the interaction region. Potential applications are foreseen for resonant laser ablation in trace analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325480
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The implementation and application of precursor-ion scanning using a four-sector instrument (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 272-277 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Precursor-ion scanning, in which all ions that fragment to form a selected product ion are detected, has been implemented on a four-sector instrument. The various experimental parameters associated with the experiment i.c., prcursor mass range, product and precursor ion resolution, collision energy and mass-measurement accuracy have been established via a series of experiments, Brief examples of the use of the technique in the characterization of synthetic polymers, quaternary salts and peptieds are described together with the analysis of a mixture of phthalate esters.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290060410
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    The use of tandem mass spectrometry as a problem-solving tool in the industrial environment (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 454-460 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: This paper deals with a number of the benefits associated with a variety of tandem mass spectrometer geometries and the way in which these configurations have been applied to the solution of real problems. It discusses the use made of a variety of tandem mass spectrometry approaches to the study of analytical problems of industrial relevance. ICIs utilization of tandem mass spectrometry has grown substantially from an initial involvement in the early 1980s to a point where a number of instruments have been installed and used predominantly for trace analysis, structural studies and in the characterization of complex mixtures. We have selected a small number of examples of the use of the various tandem mass spectrometry approaches emphasizing the unique features of the technique.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290041025
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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