✦ LIBER ✦

A novel scheme for the time-of-flight analysis of extended ion packets

✍ Scribed by Eugene Moskovets; Akos Vertes

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 78 KB
Volume: 13
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19991130)13:22<2244::aid-rcm781>3.0.co;2-h

No coin nor oath required. For personal study only.

✦ Synopsis

A new scheme is proposed for providing enhanced time-of-flight focusing of spatially extended ion packets moving with close to uniform velocity, sufficiently high for reliable ion detection. The arrangement consists of two decelerating regions with homogeneous electric fields similar to the two-stage ion reflector. The decelerating field in the first decelerating stage is created in a pulsed fashion after the ion packet has entered the first region. The effect of fringe fields produced by shielding rings and the microchannel plate detector is discussed.

📜 SIMILAR VOLUMES

A New Focused Ion Beam Optical System fo

A New Focused Ion Beam Optical System for a Time-of-flight-Secondary Ion Mass Spectrometry Instrument

✍ H. Shichi; S. Osabe; K. Kanehori 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 157 KB 👁 2 views

A new focused ion beam optical system that uses a liquid metal ion source was designed for a new secondary ion time-of-flight mass spectrometry instrument. This optical system consists mainly of two electrostatic lenses. The axial performance of the system was calculated to decide the design values

Study of laser desorption/ionization tim

Study of laser desorption/ionization time-of-flight mass spectrometry for the analysis of pesticides

✍ M. Benazouz; B. Hakim; J. L. Debrun 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 67 KB 👁 2 views

Direct desorption/ionization (no matrix) and matrix-assisted laser desorption/ionization (MALDI) were tested for the analysis of four pesticides, aldicarb, aminotriazole, dinoterb and ioxynil, at the 0.1 mg/L level in water. Only MALDI provided good sensitivities, except for aldicarb. The most inter

A NEW TIME-STEPPING SCHEME FOR THE NETWO

A NEW TIME-STEPPING SCHEME FOR THE NETWORK MODELLING OF DIFFUSION

✍ WONG, CHI CHUNG ;XIAO, HUA 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 156 KB 👁 2 views

A new class of formulas for the time integration of the network model of diusion is described. The method uses time polynomials to model the potentials in the diusion ®eld. These formulas have been implemented and tested together with the classic Crank±Nicolson (CN) scheme. Based on the chosen examp

A new technique for decomposition of sel

A new technique for decomposition of selected ions in molecule ion reactor coupled with ortho-time-of-flight mass spectrometry

✍ A. Dodonov; V. Kozlovsky; A. Loboda; V. Raznikov; I. Sulimenkov; A. Tolmachev; A 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 317 KB 👁 2 views

A molecule ion reactor (MIR), i.e. a gas filled radio-frequency only quadrupole with a longitudinal electrical field (RFQLEF), is used as an atmospheric pressure ionization interface for an orthogonal time-of-flight mass spectrometer (O-TOFMS). A new phenomenon of selective ion 'heating' in a MIR ne

Ion-neutral correlations from the dissoc

Ion-neutral correlations from the dissociation of metal oxide cluster ions in a reflectron time-of-flight mass spectrometer

✍ Van Stipdonk, M. J.; Justes, D. R.; English, R. D.; Schweikert, E. A. 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 146 KB 👁 2 views

A time-of-flight mass spectrometer with an electrostatic mirror was used to probe the composition and structure of polyatomic secondary ions via their metastable dissociation following the impact of MeV energy primary ions. The experimental approach combines event-by-event bombardment and detection

Direct analysis of filter paper blood sp

Direct analysis of filter paper blood specimens for identification of Smith-Lemli-Opitz syndrome using time-of-flight secondary ion mass spectrometry

✍ Zimmerman, Paul A.; Hercules, David M.; Naylor, Edwin W. 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 173 KB 👁 2 views

In this study, time-of-flight secondary ion mass spectrometry was used to distinguish between blood of normal infants and that of individuals with Smith-Lemli-Opitz (SLO) syndrome. SLO syndrome results in an abnormally low concentration of blood cholesterol and an elevated concentration of 7dehydroc