Development of a miniaturized, light-weight magnetic sector for a field-portable mass spectrograph

Sinha, Mahadeva P.; Tomassian, A. D.

doi:10.1063/1.1142240

Cited by 63 publications

(50 citation statements)

References 4 publications

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“…All data presented in this work are produced using a miniature MH-mass spectrometer [3,58], which is widely used in compact transportable MS and GC/MS products (IonCam). The instrument is shown in Figure 1 and its parameters are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

IonCCD Detector for Miniature Sector-Field Mass Spectrometer: Investigation of Peak Shape and Detector Surface Artifacts Induced by keV Ion Detection

Hadjar

Schlathölter

Davila

et al. 2011

J. Am. Soc. Mass Spectrom.

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A recently described ion charge coupled device detector IonCCD (Sinha and Wadsworth, Rev. Sci. Instrum. 76(2), 2005; Hadjar, J. Am. Soc. Mass Spectrom. 22(4), [612][613][614][615][616][617][618][619][620][621][622][623][624] 2011) is implemented in a miniature mass spectrometer of sector-field instrument type and MattauchHerzog (MH)-geometry (Rev. Sci. Instrum. 62(11), 2618-2620, 1991; Burgoyne, Hieftje and Hites J. Am. Soc. Mass Spectrom. 8(4), 307-318, 1997; Nishiguchi, Eur. J. Mass Spectrom. 14 (1), 7-15, 2008) for simultaneous ion detection. In this article, we present first experimental evidence for the signature of energy loss the detected ion experiences in the detector material. The two energy loss processes involved at keV ion kinetic energies are electronic and nuclear stopping. Nuclear stopping is related to surface modification and thus damage of the IonCCD detector material. By application of the surface characterization techniques atomic force microscopy (AFM) and X-ray photoelectrons spectroscopy (XPS), we could show that the detector performance remains unaffected by ion impact for the parameter range observed in this study. Secondary electron emission from the (detector) surface is a feature typically related to electronic stopping. We show experimentally that the properties of the MH-mass spectrometer used in the experiments, in combination with the IonCCD, are ideally suited for observation of these stopping related secondary electrons, which manifest in reproducible artifacts in the mass spectra. The magnitude of the artifacts is found to increase linearly as a function of detected ion velocity. The experimental findings are in agreement with detailed modeling of the ion trajectories in the mass spectrometer. By comparison of experiment and simulation, we show that a detector bias retarding the ions or an increase of the B-field of the IonCCD can efficiently suppress the artifact, which is necessary for quantitative mass spectrometry.

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Section: Methodsmentioning

confidence: 99%

IonCCD Detector for Miniature Sector-Field Mass Spectrometer: Investigation of Peak Shape and Detector Surface Artifacts Induced by keV Ion Detection

Hadjar

Schlathölter

Davila

et al. 2011

J. Am. Soc. Mass Spectrom.

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“…by Ferran [3][4][5] and Taylor, 6,7 respectively, whose main objectives were to reduce the size of the quadrupoles to 0.5-1.0 mm in diameter and 10-30 mm in length. The application of miniature quadrupole rods degrades the resolution, sensitivity, and stability of sensitivity.…”

Section: -11mentioning

confidence: 99%

“…However, they have disadvantages, such as relatively large size and complex maintenance, so further improvements are needed for the above considerations and particular application requirements of mass spectrometers. During the last few years, a growing interest has been shown in the miniaturization of mass spectrometry equipment, such as time-of-flight spectrometers, 1 ion traps, 2 sector mass filter, 3 and quadrupoles. [4][5][6] Most of this miniaturization has been focused on the geometry of the mass analyzer, such as a miniature QMS and a simplified ion trap called a rectilinear ion trap ͑RIT͒ 2 with an internal volume of only 3.5 cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Study of a micro chamber quadrupole mass spectrometer

Wang

Zhang

Mao

et al. 2008

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The design of a micro chamber quadrupole mass spectrometer ͑MCQMS͒ having a small total volume of only 20 cm 3 , including Faraday cup ion detector and ion source, is described. This MCQMS can resist a vacuum baking temperature of 400-500°C. The quadrupole elements with a hyperbolic surface are made of a ceramic material and coated with a thin metal layer. The quadrupole mass filter has a field radius of 3 mm and a length of 100 mm. Prototypes of this new MCQMS can detect a minimum partial pressure of 10 −8 Pa, have a peak width of ⌬M = 1 at 10% peak height from mass number 1 to 60, and show an excellent long-term stability. The new MCQMS is intended to be used in residual gas analyses of electron devices during a mutual pumping and baking process.

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“…Time-of-flight mass spectrometry (TOFMS) differs fundamentally from mass spectrometry techniques that use scanning instruments, such as quadrupole, [12][13][14] ion trap, [15][16][17] and magnetic sector 18 analyzers, in that the formation of discrete ions and the mass dispersion is accomplished in the time domain rather along a spatial axis. Because a complete spectrum is generated in each cycle, the relative intensities of ions in the source are accurately represented, even if source conditions change during the experiment.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Membrane Interface for Analysis of Air Samples Using Time-of-flight Mass Spectrometry

Jang¹,

Oh²,

Park³

et al. 2010

Bulletin of the Korean Chemical Society

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In the present study, we constructed a membrane inlet assembly for selective permeation of volatile airborne organic compounds for subsequent analysis by time-of-flight mass spectrometry. The time-dependent diffusion of analytes through a 75 µm thick polydimethylsiloxane membrane was measured by monitoring the ion signal after a step change in the sample concentration. The results fit well to a non-steady-state permeation equation. The diffusion coefficient, response time, and sensitivity were determined experimentally for a range of polar (halogenated) and nonpolar (aromatic) compounds. We found that the response times for several volatile organic compounds were greatly influenced by the alkyl chain length as well as the size of the substituted halogen atoms. The detection limits for benzene, ethylbenzene, and 2-propanol were 0.2 ppm, 0.1 ppm, and 3.0 ppm by volume, respectively, with a linear dynamic range greater than three orders of magnitude. These results indicate that the membrane inlet/time-of-flight mass spectrometry technique will be useful for a wide range of applications, particularly for in situ environmental monitoring.

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Development of a miniaturized, light-weight magnetic sector for a field-portable mass spectrograph

Cited by 63 publications

References 4 publications

IonCCD Detector for Miniature Sector-Field Mass Spectrometer: Investigation of Peak Shape and Detector Surface Artifacts Induced by keV Ion Detection

IonCCD Detector for Miniature Sector-Field Mass Spectrometer: Investigation of Peak Shape and Detector Surface Artifacts Induced by keV Ion Detection

Study of a micro chamber quadrupole mass spectrometer

Characterization of a Membrane Interface for Analysis of Air Samples Using Time-of-flight Mass Spectrometry

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