A New Mass Spectrometer with Improved Focusing Properties

Bleakney, Walker; Hipple, J. A.

doi:10.1103/physrev.53.521

Cited by 128 publications

(39 citation statements)

References 5 publications

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“…There are numerous physical approaches to the separation of molecules as a function of their mass as manifested in different types of mass spectrometers, including ion trap [23][24][25], time of flight [26][27][28], FT-ICR [29][30][31], and sector-based instruments [32][33][34][35][36][37][38]. Here, we focus on a subset of sector-based instruments that provide simultaneous analysis across the entire mass range of interest, as dispersed onto a single focal plane.…”

Section: Aperture Coding Modelmentioning

confidence: 99%

Order of Magnitude Signal Gain in Magnetic Sector Mass Spectrometry Via Aperture Coding

Chen

Russell

Amsden

et al. 2015

J. Am. Soc. Mass Spectrom.

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Abstract. Miniaturizing instruments for spectroscopic applications requires the designer to confront a tradeoff between instrument resolution and instrument throughput [and associated signal-to-background-ratio (SBR)]. This work demonstrates a solution to this tradeoff in sector mass spectrometry by the first application of onedimensional (1D) spatially coded apertures, similar to those previously demonstrated in optics. This was accomplished by replacing the input slit of a simple 90°magnetic sector mass spectrometer with a specifically designed coded aperture, deriving the corresponding forward mathematical model and spectral reconstruction algorithm, and then utilizing the resulting system to measure and reconstruct the mass spectra of argon, acetone, and ethanol. We expect the application of coded apertures to sector instrument designs will lead to miniature mass spectrometers that maintain the high performance of larger instruments, enabling field detection of trace chemicals and point-of-use mass spectrometry.

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Section: Aperture Coding Modelmentioning

confidence: 99%

Order of Magnitude Signal Gain in Magnetic Sector Mass Spectrometry Via Aperture Coding

Chen

Russell

Amsden

et al. 2015

J. Am. Soc. Mass Spectrom.

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“…A cycloid [3] has the advantages of being both velocity and direction focusing, of requiring no RF generator, and, except for the filament of the electron source, of requiring only modest (not exceeding a few hundred volts) DC voltages at low current.…”

Section: Mass Analyzermentioning

confidence: 99%

Field testing of lake water chemistry with a portable and an AUV-based mass spectrometer

Hemond

Mueller

Hemond

2008

J. Am. Soc. Mass Spectrom.

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Two mass spectrometers (MS) are tested for the measurement of volatile substances, such as hydrocarbons and metabolic gases, in natural waters. KOALA is a backpackable MS operated from above the water surface, in which samples are pumped through a flow cell using a syringe. NEREUS is an underwater instrument hosted by an autonomous underwater vehicle (AUV) that is linked to a communications network to provide chemical data in real time. The mass analyzers of the two MS are nearly identical cycloids, and both use flat-plate membrane inlets. Testing took place in an eutrophic, thermally stratified lake exhibiting steep chemical gradients and significant levels of methane. KOALA provided rapid multispecies analysis of dissolved gases, with a detection limit for methane of 0.1 ppm (readily extendable to 0.01 ppm) and savings of time of at least a factor of 10 compared to that of conventional analysis. The AUV-mounted NEREUS additionally provided rapid spatial coverage and the capability of performing chemical surveys autonomously. Tests demonstrated the need for temperature control of a membrane inlet when steep thermal gradients are present in a water body, as well as the benefits of co-locating all sensors on the AUV to avoid interference from chemically different waters entering and draining from the free-flooding outer hull. The ability to measure dissolved volatiles provided by MS offers potential for complementarity with ionic sensors in the study of natural waters, such as in the case of the carbonate system. (J Am Soc Mass

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“…Equations of motion for particles in perpendicular electric and magnetic fields are well known and can be found in references [21,22], for example, and can be used for a first approximation of the separation principles. The projection of the path of a charged particle in perpendicular electric and magnetic fields is a trochoid in the plane perpendicular to the magnetic field.…”

Section: Bgs + Fiona -Conceptmentioning

confidence: 99%

Prospects ofAandZidentification experiments at LBNL

Gates

2016

EPJ Web Conf.

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Abstract. The identification of six new elements within the last 15 years and with proton numbers, Z = 113-118 has transformed the heavy element field. However, one key piece of information on these nuclei remains unmeasured: their proton and mass numbers, A. At Lawrence Berkeley National Laboratory, the heavy element group has undertaken a program to study these new elements to perform experiments aimed at measuring the Z and A.Here, an overview of recent experiments aimed towards identifying the Z of SHE, and the prospects for Z and A identification experiments at LBNL are presented.

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A New Mass Spectrometer with Improved Focusing Properties

Cited by 128 publications

References 5 publications

Order of Magnitude Signal Gain in Magnetic Sector Mass Spectrometry Via Aperture Coding

Order of Magnitude Signal Gain in Magnetic Sector Mass Spectrometry Via Aperture Coding

Field testing of lake water chemistry with a portable and an AUV-based mass spectrometer

Prospects ofAandZidentification experiments at LBNL

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