Some experiments performed with a variable width monitor slit on a double-focusing mass spectrometer of Nier-Johnson geometry

Beynon, J. H.; Fontaine, A.; Hopkinson, J. A.; Williams, A. E.

doi:10.1016/0020-7381(69)80067-7

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Multiply-charged Metastable and Negatively-charged Ions1

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1970

1978

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Cited by 8 publications

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“…Narrowing the width of the intermediate slit of an AEI MS-9 to the width of the main ion beam increases the energy-resolving power without proportionate decrease in sensitivity, a result of practical significance when studying metastable decompositions (1215). Variation of the accelerating voltage in an MS-9 has been used to vary the time interval between formation of a metastable ion and observation of its decomposition, showing that the energy released is a function of the ion life-time (1216).…”

Section: Multiply-charged Metastable and Negatively-charged Ionsmentioning

confidence: 99%

Mass spectrometry

DeJongh¹

1970

Anal. Chem.

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Section: Multiply-charged Metastable and Negatively-charged Ionsmentioning

confidence: 99%

Mass spectrometry

DeJongh¹

1970

Anal. Chem.

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Metastable ion fragmentation processes in n‐alkanes

Goldberg¹,

Hopkinson²,

Mathias³

et al. 1970

Org. Mass Spectrom.

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The n-alkanes, propane to heptane, have been studied in a modified MS-9 mass spectrometer under conditions that enabled the daughter ions, resulting from metastable fragmentation processes occurring in the first field free region, to be observed with high sensitivity. The precursor ions in these fragmentations have been identified unambiguously and a general fragmentation scheme for the n-alkanes is proposed. The mass spectrometer incorporated a variable width monitor slit and narrow settings of this slit improved the energy resolution so that fine structure could be observed in some of the 'metastable peaks'. The implications of this fine structure are discussed. 1009* J. A. Hopkinson, unpublished work.

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The electron‐impact‐induced fragmentation of acridine

Acheson

Aplin

Bolton

1974

Org. Mass Spectrom.

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Studies of both high and low resolution spectra, and of metastable decompositions occurring in both the first and second field-free regions of the mass spectrometer have led to a postulated scheme for the fragmentation of acridine under electron-impact. There is no specific loss of label from either [9-2Hl]acridine or [4,5-2H,]acridine in any fragmentation, nor is there any total scrambling of label in either molecular ion prior to loss of HCN. There is certainly some degree of scrambling preceding HCN loss from [MI+. at 70 eV, but this does not involve the 9-H to any detectable extent. There is no strong evidence for the acridine molecular ion having the same structure as that of four other C,,H,N isomers.

show abstract

Some experiments performed with a variable width monitor slit on a double-focusing mass spectrometer of Nier-Johnson geometry

Cited by 8 publications

References 4 publications

Mass spectrometry

Mass spectrometry

Metastable ion fragmentation processes in n‐alkanes

The electron‐impact‐induced fragmentation of acridine

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