�ber einen neuen Massenspektrographen

Mattauch, J.; Herzog, R.

doi:10.1007/bf01341392

Cited by 278 publications

(78 citation statements)

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“…Since this procedure differs from the conventional analytic protocol in which noble gases are first purified and then released into a mass spectrometer at a single well-defined time, we describe it in more detail. The gas extraction, processing, and analysis system is composed of three sections in series: (a) a multi-sample furnace in which samples wrapped in Pt foil are connected across Pt leads and heated by stepped pulses of increasing electrical power; (b) a gas purification section equipped with Westinghouse @ WL and NP10 getters, a SAES @ metal appendage getter, and cryopumping on stainless steel (SS) and activated charcoal fingers at liquid N 2 temperature; and (c) a 3 .75 double-focusing Mattauch-Herzog geometry mass spectrometer equipped with pulse-counting detectors (Mattauch & Herzog 1934;Nier & Schlutter 1985). Gases evolved during a heating step in (a) are released directly into section (b) where they are exposed to the getters and cryopumped for one minute on the SS finger to reduce abundances of chemically active and condensable species.…”

Section: Totalsmentioning

confidence: 99%

Presolar Grains From Novae: Evidence From Neon and Helium Isotopes in Comet Dust Collections

Pepin

Palma

Gehrz

et al. 2011

ApJ

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Presolar grains in meteorites and interplanetary dust particles carry non-solar isotopic signatures pointing to origins in supernovae, giant stars, and possibly other stellar sources. There have been suggestions that some of these grains condensed in the ejecta of classical nova outbursts, but the evidence is ambiguous. We report neon and helium compositions in particles captured on stratospheric collectors flown to sample materials from comets 26P/Grigg-Skjellerup and 55P/Tempel-Tuttle that point to condensation of their gas carriers in the ejecta of a neon (ONe) nova. The absence of detectable 3 He in these particles indicates space exposure to solar wind irradiation of a few decades at most, consistent with origins in cometary dust streams. Measured

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Section: Totalsmentioning

confidence: 99%

Presolar Grains From Novae: Evidence From Neon and Helium Isotopes in Comet Dust Collections

Pepin

Palma

Gehrz

et al. 2011

ApJ

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“…Electron ionization, which was the most practical approach at the time, limited analysis to volatile and semivolatile organics. Moreover, early mass spectrometers based on the magnetic sector technology of the 1940s and 1950s could achieve mass resolving power of 10,000 or higher but were inherently limited by slit-dependent resolution (1,2). Narrowing the slit increased resolving power but at the expense of reduced S/N.…”

Section: Infant Yearsmentioning

confidence: 99%

Petroleomics: MS Returns to Its Roots.

Rodgers¹,

Schaub²,

Marshall³

2005

Anal. Chem.

287

312

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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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�ber einen neuen Massenspektrographen

Cited by 278 publications

References 0 publications

Presolar Grains From Novae: Evidence From Neon and Helium Isotopes in Comet Dust Collections

Presolar Grains From Novae: Evidence From Neon and Helium Isotopes in Comet Dust Collections

Petroleomics: MS Returns to Its Roots.

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

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