A LASER PROBE COUPLED WITH ICP DOUBLE-FOCUSING SECTOR-FIELD MASS SPECTROMETER FOR IN SITU ANALYSIS OF GEOLOGICAL SAMPLES AND U Pb DATING OF ZIRCON

2003 ◽  
Vol 41 (2) ◽  
pp. 259-272 ◽  
Author(s):  
M. Tiepolo ◽  
P. Bottazzi ◽  
M. Palenzona ◽  
R. Vannucci
Keyword(s):  
Mass Spectrometer ◽  
In Situ Analysis ◽  
Geological Samples ◽  
Field Mass ◽  
Laser Probe ◽  
Double Focusing

scholarly journals A comparison between the two lobes of comet 67P/Churyumov–Gerasimenko based on D/H ratios in H2O measured with the Rosetta/ROSINA DFMS

2019 ◽  
Vol 489 (4) ◽  
pp. 4734-4740 ◽  
Author(s):  
Isaac R H G Schroeder ◽  
Kathrin Altwegg ◽  
Hans Balsiger ◽  
Jean-Jacques Berthelier ◽  
Michael R Combi ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
European Space Agency ◽  
Cometary Nucleus ◽  
The Other ◽  
Appreciable Difference ◽  
Space Agency ◽  
Close Proximity ◽  
Double Focusing ◽  
Comet 67P

ABSTRACT The nucleus of the Jupiter-family comet 67P/Churyumov–Gerasimenko was discovered to be bi-lobate in shape when the European Space Agency spacecraft Rosetta first approached it in 2014 July. The bi-lobate structure of the cometary nucleus has led to much discussion regarding the possible manner of its formation and on how the composition of each lobe might compare with that of the other. During its two-year-long mission from 2014 to 2016, Rosetta remained in close proximity to 67P/Churyumov–Gerasimenko, studying its coma and nucleus in situ. Based on lobe-specific measurements of HDO and H2O performed with the ROSINA Double Focusing Mass Spectrometer (DFMS) on board Rosetta, the deuterium-to-hydrogen (D/H) ratios in water from the two lobes can be compared. No appreciable difference was observed, suggesting that both lobes formed in the same region and are homogeneous in their D/H ratios.

scholarly journals In-Situ Analysis of Essential Fragrant Oils Using a Portable Mass Spectrometer

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Fred P. M. Jjunju ◽  
Stamatios Giannoukos ◽  
Alan Marshall ◽  
Stephen Taylor
Keyword(s):  
Mass Spectrometer ◽  
Direct Analysis ◽  
Ambient Air ◽  
In Situ Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Standard Samples ◽  
Active Compounds ◽  
Portable Mass Spectrometer ◽  
Methyl Butanoate

A portable mass spectrometer was coupled to a direct inlet membrane (DIM) probe and applied to the direct analysis of active fragrant compounds (3-methylbutyl acetate, 2-methyl-3-furanthiol, methyl butanoate, and ethyl methyl sulfide) in real time. These fragrant active compounds are commonly used in the formulation of flavours and fragrances. Results obtained show that the portable mass spectrometer with a direct membrane inlet can be used to detect traces of the active fragrant compounds in complex mixtures such as essential fragrant oils and this represents a novel in-situ analysis methodology. Limits of detection (LOD) in the sub-ppb range (< 2.5 pg) are demonstrated. Standard samples in the gaseous phase presented very good linearity with RSD % at 5 to 7 for the selected active fragrant compounds (i.e., isoamyl acetate, 2-methyl-3-furanthiol, methyl butanoate, and methyl ethyl sulphide). The rise and fall times of the DIM probe are in the ranges from 15 to 31 seconds and 23 to 41 seconds, respectively, for the standard model compounds analysed. The identities of the fragrance active compounds in essential oil samples (i.e., banana, tangerine, papaya, and blueberry muffin) were first identified by comparison with a standard fragrance compounds mixture using their major fragment peaks, the NIST standard reference library, and gas chromatography mass spectrometry (GC-MS) analysis. No sample preparation is required for analysis using a portable mass spectrometer coupled to a DIM probe, so the cycle time from ambient air sampling to the acquisition of the results is at least 65 seconds.

In Situ Analysis of Organic Material with a Portable Mass Spectrometer

2012 ◽  
Author(s):  
S. Soparawalla ◽  
J. Duncan ◽  
A. M. Fisher ◽  
I. Kanik ◽  
L. W. Beegle
Keyword(s):  
Mass Spectrometer ◽  
Organic Material ◽  
In Situ Analysis ◽  
Portable Mass Spectrometer

scholarly journals 16O/18O ratio in water in the coma of comet 67P/Churyumov-Gerasimenko measured with the Rosetta/ROSINA double-focusing mass spectrometer

2019 ◽  
Vol 630 ◽  
pp. A29 ◽  
Author(s):  
Isaac R. H. G. Schroeder I ◽  
Kathrin Altwegg ◽  
Hans Balsiger ◽  
Jean-Jacques Berthelier ◽  
Johan De Keyser ◽  
...  
Keyword(s):  
Solar System ◽  
Mass Spectrometer ◽  
European Space Agency ◽  
Space Agency ◽  
Close Proximity ◽  
Terrestrial Water ◽  
Double Focusing ◽  
Comet 67P ◽  
Almost Continuous

The European Space Agency spacecraft Rosetta accompanied the Jupiter-family comet 67P/Churyumov-Gerasimenko for over 2 yr along its trajectory through the inner solar system. Between 2014 and 2016, it performed almost continuous in situ measurements of the comet’s gaseous atmosphere in close proximity to its nucleus. In this study, the 16O/18O ratio of H2O in the coma of 67P/Churyumov-Gerasimenko, as measured by the ROSINA DFMS mass spectrometer onboard Rosetta, was determined from the ratio of H216O/H218O and 16OH/18OH. The value of 445 ± 35 represents an ~11% enrichment of 18O compared with the terrestrial ratio of 498.7 ± 0.1. This cometary value is consistent with the comet containing primordial water, in accordance with leading self-shielding models. These models predict primordial water to be between 5 and 20% enriched in heavier oxygen isotopes compared to terrestrial water.

Elastic scattering phenomena in mass analyzers with tandem fields

1970 ◽  
Vol 48 (14) ◽  
pp. 1735-1742 ◽  
Author(s):  
D. Ioanoviciu
Keyword(s):  
Elastic Scattering ◽  
Mass Spectrometer ◽  
Current Distribution ◽  
Mass Spectra ◽  
Ion Beam ◽  
Field Mass ◽  
Beam Path ◽  
Double Focusing

The elastic scattering in the tandem field mass analyzing systems is considered. The analysis includes deflecting electrostatic and magnetic converging, dispersing, diverging fields, and also the fields of quadrupoles. The influence of slits located on the ion beam path is indicated. An example illustrates the effect of slits on the elastically scattered current distribution in a double focusing mass spectrometer. Another example gives an idea about the influence of the diverging field on the peak tails in mass spectra.

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