scholarly journals Fundamentals of Mass Spectrometry -Basic Understanding of Penning Ionization-

2009 ◽  
Vol 57 (6) ◽  
pp. 393-404 ◽  
Author(s):  
Masatoshi UKAI
Keyword(s):  
Mass Spectrometry ◽  
Penning Ionization ◽  
Basic Understanding

Products from interaction of aromatic nitrocompounds with argon metastables inside a gas chromatograph

1981 ◽  
Vol 59 (10) ◽  
pp. 1439-1448 ◽  
Author(s):  
Walter A. Aue ◽  
Veluppillai Paramasigamani ◽  
Jae H. Kim
Keyword(s):  
Mass Spectrometry ◽  
Nitro Group ◽  
Gas Chromatograph ◽  
Chromatographic System ◽  
Penning Ionization ◽  
Aromatic Nitrocompounds ◽  
Discharge Chemistry

The neutral products resulting from the degradation of aromatic nitrocompounds, following interaction with argon metastables (presumably by Penning ionization), have been studied inside a gas chromatographic system. The simplest but typical example, nitrobenzene, yields benzene and phenol. Product ratios sometimes resemble results of mass spectrometry more than they do data obtained by pyrolysis. The ease of elimination of substituents from monohalogenated nitrobenzenes follows the order I > NO2 > Br > Cl. Ratios of the products resulting from loss of NO (rearrangement) versus loss of NO2 have been measured for a variety of compounds. The leaving NO2 group can be replaced by I if the system is doped with iodine vapour. Reduction of the nitro group and ring closures are observed with some of the more complex substrates, similar to results known from discharge chemistry.

scholarly journals Exciton energy transfer reveals spectral signatures of excited states in clusters

2020 ◽  
Vol 22 (25) ◽  
pp. 14284-14292
Author(s):  
Wenchao Lu ◽  
Ricardo B. Metz ◽  
Tyler P. Troy ◽  
Oleg Kostko ◽  
Musahid Ahmed
Keyword(s):  
Mass Spectrometry ◽  
Energy Transfer ◽  
Excited States ◽  
Electronic Excitation ◽  
Electronic Structure Calculations ◽  
Exciton Energy ◽  
Penning Ionization ◽  
Spectral Signatures ◽  
Photoionization Mass Spectrometry ◽  
Structure Calculations

Electronic excitation and concomitant energy transfer leading to Penning ionization in argon–acetylene clusters are investigated with synchrotron-based photoionization mass spectrometry and electronic structure calculations.

Atmospheric-pressure Penning ionization mass spectrometry

2004 ◽  
Vol 18 (19) ◽  
pp. 2323-2330 ◽  
Author(s):  
Kenzo Hiraoka ◽  
Susumu Fujimaki ◽  
Shizuka Kambara ◽  
Hiroko Furuya ◽  
Shigemitsu Okazaki
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Penning Ionization

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.

Applications of Time-OF-Flight Secondary Ion Mass Spectrometry (TOF-SIMS)

1990 ◽  
Vol 48 (2) ◽  
pp. 308-309
Author(s):  
Bruno Schueler ◽  
Robert W. Odom
Keyword(s):  
Mass Spectrometry ◽  
Secondary Ion Mass Spectrometry ◽  
Structural Information ◽  
Time Of Flight ◽  
Biological Tissues ◽  
Polymer Surfaces ◽  
Tof Sims ◽  
Secondary Ions ◽  
Ion Mass Spectrometry ◽  
Secondary Ion

Time-of-flight secondary ion mass spectrometry (TOF-SIMS) provides unique capabilities for elemental and molecular compositional analysis of a wide variety of surfaces. This relatively new technique is finding increasing applications in analyses concerned with determining the chemical composition of various polymer surfaces, identifying the composition of organic and inorganic residues on surfaces and the localization of molecular or structurally significant secondary ions signals from biological tissues. TOF-SIMS analyses are typically performed under low primary ion dose (static SIMS) conditions and hence the secondary ions formed often contain significant structural information.This paper will present an overview of current TOF-SIMS instrumentation with particular emphasis on the stigmatic imaging ion microscope developed in the authors’ laboratory. This discussion will be followed by a presentation of several useful applications of the technique for the characterization of polymer surfaces and biological tissues specimens. Particular attention in these applications will focus on how the analytical problem impacts the performance requirements of the mass spectrometer and vice-versa.

Sign in / Sign up

Export Citation Format

Share Document