Alkane elimination in mass spectrometry. A counterpart to the McLafferty rearrangement

1976 ◽  
Vol 98 (7) ◽  
pp. 2011-2013 ◽  
Author(s):  
J. F. Litton ◽  
T. L. Kruger ◽  
R. G. Cooks
Keyword(s):  
Mass Spectrometry ◽  
Mclafferty Rearrangement ◽  
Alkane Elimination

scholarly journals Analysis of General McLafferty Rearrangement in Mass Spectrometry

Daxue Huaxue ◽  
2020 ◽  
Vol 35 (1) ◽  
pp. 111-117
Author(s):  
Hongbo Li ◽  
◽  
Pohui Wang
Keyword(s):  
Mass Spectrometry ◽  
Mclafferty Rearrangement

scholarly journals Mass spectrometry of 2-alkylthio-2-methylpropanoic acids and their esters and amides. Structural and steric effects on the McLafferty rearrangement.

1983 ◽  
Vol 31 (5) ◽  
pp. 1505-1517 ◽  
Author(s):  
YUJI MORI ◽  
SHIGERU FUJIWARA ◽  
TOSHIKO MIYACHI ◽  
HIROYUKI KITANISHI ◽  
MASAYUKI OYA ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Steric Effects ◽  
Mclafferty Rearrangement

How SIMS microscopy can be used in medicine

1992 ◽  
Vol 50 (2) ◽  
pp. 1602-1603
Author(s):  
Philippe Fragu
Keyword(s):  
Mass Spectrometry ◽  
Biomedical Applications ◽  
Secondary Ion Mass Spectrometry ◽  
Chemical Elements ◽  
Biological Applications ◽  
The Past ◽  
Potential Source ◽  
Secondary Ion ◽  
Chemical Integrity ◽  
Scientific Endeavour

The identification, localization and quantification of intracellular chemical elements is an area of scientific endeavour which has not ceased to develop over the past 30 years. Secondary Ion Mass Spectrometry (SIMS) microscopy is widely used for elemental localization problems in geochemistry, metallurgy and electronics. Although the first commercial instruments were available in 1968, biological applications have been gradual as investigators have systematically examined the potential source of artefacts inherent in the method and sought to develop strategies for the analysis of soft biological material with a lateral resolution equivalent to that of the light microscope. In 1992, the prospects offered by this technique are even more encouraging as prototypes of new ion probes appear capable of achieving the ultimate goal, namely the quantitative analysis of micron and submicron regions. The purpose of this review is to underline the requirements for biomedical applications of SIMS microscopy.Sample preparation methodology should preserve both the structural and the chemical integrity of the tissue.

Imaging of Al-Li-Cu alloys with a Scanning Ion Microprobe

1990 ◽  
Vol 48 (2) ◽  
pp. 314-315
Author(s):  
K.K. Soni ◽  
D.B. Williams ◽  
J.M. Chabala ◽  
R. Levi-Setti ◽  
D.E. Newbury
Keyword(s):  
Mass Spectrometry ◽  
Secondary Ion Mass Spectrometry ◽  
Equilibrium Phase ◽  
Icosahedral Symmetry ◽  
Ion Microprobe ◽  
X Ray ◽  
Cu Alloys ◽  
Two Phases ◽  
The University ◽  
Secondary Ion

In contrast to the inability of x-ray microanalysis to detect Li, secondary ion mass spectrometry (SIMS) generates a very strong Li+ signal. The latter’s potential was recently exploited by Williams et al. in the study of binary Al-Li alloys. The present study of Al-Li-Cu was done using the high resolution scanning ion microprobe (SIM) at the University of Chicago (UC). The UC SIM employs a 40 keV, ∼70 nm diameter Ga+ probe extracted from a liquid Ga source, which is scanned over areas smaller than 160×160 μm2 using a 512×512 raster. During this experiment, the sample was held at 2 × 10-8 torr.In the Al-Li-Cu system, two phases of major importance are T1 and T2, with nominal compositions of Al2LiCu and Al6Li3Cu respectively. In commercial alloys, T1 develops a plate-like structure with a thickness <∼2 nm and is therefore inaccessible to conventional microanalytical techniques. T2 is the equilibrium phase with apparent icosahedral symmetry and its presence is undesirable in industrial alloys.

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