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  • 1
    Electronic Resource
    Electronic Resource
    The application of capillary SFC, packed column SFC, and capillary SFC-MS in the analysis of controlled drugs (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 537-541 
    Details
    ISSN: 0935-6304
    Keywords: Capillary SFC ; Packed column SFC ; Capillary SFC-MS ; Controlled drugs ; Modified mobile phase generation ; Negative temperature programming ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Multi-component mixtures of controlled drugs, drug impurities, and adulterants have been analyzed by capillary SFC-FID, packed column SFC-UV, and capillary SFC-MS. Isocratic packed column SFC has been performed with binary and ternary mobile phases using a single syringe pump. The combination of capillary SFC and double focusing MS is described with reference to MS source pressures and the spectra obtained. The use of negative temperature programming in SFC is described.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140805
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  • 2
    Electronic Resource
    Electronic Resource
    Extending the mass range of the quadrupole ion trap using axial modulation (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 225-229 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Secondary-ion mass spectrometry, using Cs+ ion bombardment of solid and liquid matrices, has been implemented on a quadrupole ion trap. Tetraalkylammonium cations and protonated peptides, generated in an external source using a pulsed primary-ion beam, are injected into the ion trap where they are decelerated and trapped in the course of collisions with the helium bath gas. The contents of the trap are then examined by recording a mass spectrum using the mass-selective instability scan. To improve performance in the examination of these trapped ions, the technique of axial modulation is used to cause resonance ejection of ions from the trap during the mass-analysis step. The supplementary AC voltage applied to the end-caps causes resonant ejection of ions at qz values below those which correspond to the normal stability limit. This is demonstrated to increase the mass limit of a commercial ion trap from 650 Da to approximately 1300 Da with no loss in resolution or sensitivity, and to more than 20 000 Da at reduced sensitivity.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030706
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  • 3
    Electronic Resource
    Electronic Resource
    Tandem mass spectrometry of prostaglandins: A comparison of an ion trap and a reversed geometry sector instrument (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 105-109 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020602
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  • 4
    Electronic Resource
    Electronic Resource
    Mass range extension in a quadrupole ion-trap mass spectrometer (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 50-53 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A quadrupole ion-trap mass spectrometer having half the dimensions of the commercial ion-trap instrument has been built. When operated in the mass-selective instability mode using the commercial electronics and data system and the standard vacuum system, it yields a mass range of 〉 2500 Da. This represents achievement of the expected fourfold increase in mass range upon halving the trap radius (to 0.5 cm). The sensitivity of the miniature trap is comparable to that of the commercial ion-trap; however, resolution is inferior, partly due to the high mass-scan rate. The effects of using relatively high pressures of helium as a buffer gas are discussed in relation to improving sensitivity and resolution. The use of the high-mass ion-trap as a device for studying biomolecules is discussed and methods of extending the mass range even further are suggested.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030213
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  • 5
    Electronic Resource
    Electronic Resource
    High mass-resolution using a quadrupole ion-trap mass spectrometer (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 327-329 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Modifications have been made to the quadrupole ion-trap mass spectrometer (ITMS) to improve the resolution. An offset-digital-to-analog converter/attenuator network is used to slow down the scan rate in the mass-selective instability mode of operation with reasonance ejection. Attenuations of the scan rate by 200 to 700 times increase the resolution from 500 (with no attenuation) to 40 000 and 100 000 (full width at half maximum), respectively, for the [M + H]+ peak of substance p (m/z 1348). These improved resolutions are achieved in experiments which use resonance ejection to extend the mass-to-charge range.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290050706
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  • 6
    Electronic Resource
    Electronic Resource
    Improved accuracy of mass measurement with a quadrupole ion-trap mass spectrometer (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 524-527 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Mass Measurement accuracy of better than 0.015% on protonated gramicidin S (nominal chemical average molecular weight 1141.5 Da) and its first three isotopes has been achieved using reasonant ion ejection in the quadrupole ion-trap mass spectrometer operated at unit resolution. Analyte and Calibrant ions are subjected to identical injection and trapping conditions when desorbed by Cs+ ions from a split prone-tip and co-injected into the trap. When the mass analysis scan rate is slowed, enhanced resolution is achieved for all ions but the mass range accessed in a single scan of the digital-to-analog converter, which controls the mass analysis scan, is limited making calibration difficult. A peak-matching procedure is described for use at these higher resolution conditions in which the offset voltage which determines the origin of the RF amplitude ramp is adjusted in such a fashion that the analyte and calibrant ions occur at the same point in the mass analysis scan. This procedure gave an improved mass measurement accuracy of better than 0.007% for the protonated gramicidin S. ions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060808
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  • 7
    Electronic Resource
    Electronic Resource
    Sputter yields of ammonium chloride and solid glycerol (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 67-68 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We have measured the sputtering yields of ammonium chloride and of frozen glycerol films under 8 keV Ar+· bombardment using a thin film depth profiling technique. The sputtering yield of ammonium chloride was 34±3 molecules (NH4Cl)/ion; for frozen glycerol the sputter yield was 54±9 molecules/ion. The results constrain possible mechanisms of damage suppression in organic secondary ion mass spectrometry.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020404
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  • 8
    Electronic Resource
    Electronic Resource
    Collisionally activated dissociation of peptides using a quadrupole ion-trap mass spectrometer (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 30-33 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The ion-trap mass spectrometer can be used to record mass and multi-stage tandem mass spectra (MSn) on small peptides. The compounds are ionized by Cs+ surface ionization, injected into the trap, mass selected, activated by collision, resulting in dissociation and mass-selectively ejected. Tandem mass spectrometric data on sub-fmol amounts of Gramicidin S are shown, along with tandem mass spectrometric and MSn data on two other peptides. The experiment is distinguished by its very high sensitivity and the high quality of sequence information obtained.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040109
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  • 9
    Electronic Resource
    Electronic Resource
    Aromatic hydrocarbon derivatives of fullerences (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 472-474 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The fullerences C60 and C70 form adducts with toluene, p-xylene and other aromatic compounds when refluxed in these solvents in the presences of FeCl3. Benzene derivatives are produced only when bromine is also present. Mass spectra of the reaction mixtures indicate the presence of derivatives including 1:1 adducts, as well as products of multiple additions of the aromatic molecules and their dehydrogenation products. Tandem mass spectrometry provides evidence for C—C bonds formation between the adducts and fullerences.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290051010
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  • 10
    Electronic Resource
    Electronic Resource
    Letters to the editor (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 92-93 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290050210
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