Mass spectrum measurement using a one-dimensional focal plane detector

Birkinshaw, K.

doi:10.1016/s1387-3806(01)00545-0

Cited by 12 publications

(10 citation statements)

References 27 publications

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“…The uniformity of the detector, given by the standard deviation of the response divided by the mean was found to be 7.9%. Although this is higher than the figure of 4% quoted for the LBNL detector [7] , most of this nonuniformity can be removed by correction techniques [9].…”

mentioning

confidence: 58%

A fully integrated multi-channel detector for electron spectroscopy

Langstaff

Bushell

Chase

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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In electron spectroscopy, multi-channel detection combined with intense radiation sources provides the optimum experimental configuration. Building on the 5 mm, 192-channel ion detector developed at Aberystwyth, longer arrays have been fabricated for the detection of electrons in a commercial hemispherical analyser. The performance and reliability of a 10 mm, 384-detector array is discussed and the first array-detected photoelectron spectroscopy data for single-crystal diamond are presented. In scanning mode, the detector shows a large improvement compared to single channeltron detection and this improvement allows data to be collected in snapshot mode (1 second per spectrum) to enable real-time measurements.

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mentioning

confidence: 58%

A fully integrated multi-channel detector for electron spectroscopy

Langstaff

Bushell

Chase

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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“…Further, these instruments often yield duty cycles much less than unity, since no sampling can occur while a mass analysis is underway. For these reasons, several investigators have pursued means of continuous and simultaneous detection for mass spectrometry [56][57][58][59].…”

Section: Array Detector Atomic Mass Spectrometry (Adams)mentioning

confidence: 99%

Plasma-source mass spectrometry for speciation analysis: state-of-the-art

Ray¹,

Andrade²,

Gamez³

et al. 2004

Journal of Chromatography A

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Current and emerging capabilities of plasma-source mass spectrometry (PS-MS) as it is employed for elemental speciation analysis are reviewed. Fundamental concepts and their advantageous aspects, experimental conditions, and analytical performance are described and illustrated by recent examples from the literature. Novel instrumentation, techniques, and strategies for inductively-coupled plasma mass spectrometry (ICP-MS), microwave-induced plasma (MIP) mass spectrometry, glow-discharge (GD) mass spectrometry, and electrospray ionization (ESI), among others, are described. The use of ionization sources that provide tunable ionization, others that can be modulated between different sets of operating conditions, and others used in parallel is also examined.

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“…It is vital to correct this for good quality measurements. Fortunately, correction can be achieved by mathematical modelling of the measurement process using matrix algebra:2, 3 where A can be measured experimentally and is a square matrix representing the array and b and c are column matrices representing the incident and measured spectra, respectively.…”

Section: Measurement and Processingmentioning

confidence: 99%

“…Where the A matrix is measured by placing a narrow incident beam of known intensity above each detector,2, 3 the probability that ions incident above detector j are measured by detector i can be straightforwardly computed to give the element A ij . Where the incident intensity is not known then A ij is proportional to the probability and the proportionality constant g is used in the Results section.…”

Section: Measurement and Processingmentioning

confidence: 99%

“…When the measurement is completed, the number of ions incident on detector u was b u (unknown). A useful idealization which can be closely approximated is that there is no error in b u when working in the region of stable operation3 (RSO) and the peak maximum should not be changed. This is equivalent to saying that the standard deviation of the counts is zero at the peak maximum for a high‐quality detector array.…”

Section: Forward Deconvolutionmentioning

confidence: 99%

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Deconvolution of mass spectra measuredwith a non‐uniform detector array to give accurate ion abundances

Birkinshaw¹

2003

J. Mass Spectrom.

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Array detectors are under active development since they offer large improvements in the efficiency of mass spectrum measurements. High quality is always a requirement whether array detectors are used for ions, electrons, UV, x-rays, etc., but in mass spectrometry the very high accuracy frequently needed in ion abundance measurements for isotope ratios is unique. These demands necessitate modelling the measurement process and careful deconvolution of the measured data. A linear model in terms of matrix algebra is presented in which the incident spectrum (unknown) and the measured spectrum are represented by column matrices and the action of the detector array on the incident spectrum is represented by an experimentally measurable square 'A' matrix. Residual noise in this matrix can be minimized following a singular value decomposition procedure and its use in 'forward deconvolution' of measured spectra is discussed. The random error in the incident ion counts is accounted for after the deconvolution since this is not an error from the perspective of the detector. The microchannel plate electron multiplier gain distribution is an important feature of the deconvolution.

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Mass spectrum measurement using a one-dimensional focal plane detector

Cited by 12 publications

References 27 publications

A fully integrated multi-channel detector for electron spectroscopy

A fully integrated multi-channel detector for electron spectroscopy

Plasma-source mass spectrometry for speciation analysis: state-of-the-art

Deconvolution of mass spectra measuredwith a non‐uniform detector array to give accurate ion abundances

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