Compact time-of-flight mass spectrometer using particle-induced desorption

Summers, W. R.; Schweikert, E. A.

doi:10.1063/1.1138892

Cited by 23 publications

(1 citation statement)

References 7 publications

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“…The surface Li concentration of the two samples was determined by particle desorption mass spectrometry (PDMS), [21] which is a surface sensitive technique capable of analyzing only the top 1-3 monolayers of the sample.…”

Section: Modification Of Surface Activitymentioning

confidence: 99%

The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides

et al. 1987

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If the ionic radii are compatible, alkali metal ions will substitute for the divalent metal ions in magnesium oxide, calcium oxide and zinc oxide.At high temperatures in the presence of molecular oxygen, centers of the type [M+O-] are formed, where M+-Group IA ion.The 0-ions in equilibrium with these centers are effective in H" abstraction from CH 4 , which is the first step in the oxidative dimerization reaction. At reaction temperatures >720 0 C alkali metal oxides formed on the catalytic surface may themselves become active centers. Alkali metal carbonates also may inhibit the activity of the host oxide and sinter the oxide, thereby eliminating corner sites which result in complete oxidation.

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Section: Modification Of Surface Activitymentioning

confidence: 99%

The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides

et al. 1987

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Cf‐252 particle desorption mass spectrometry of photo‐oxidized polystyrene

Quinones

Schweikert

1990

Surface & Interface Analysis

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Cf-252 particle (plasma) desorption mass spectra are presented for polystyrene surfaces before and after exposure in air to UV light. The photooxidation produces changes observed in both positive and negative ion spectra.Oxygen incorporation produces a slight increase in intensity of m/z' 18 and 19 (HzO' and H,O') and m/z-16 and 17 (0-and OH-). Also, the relative intensity of m/z' 91 decrenses after photooxidation and is interpreted as the formation of a bond alpha to the benzene ring. New peaks are detected at m/z' 226, 227 and 331, and are tentatively assigned to hydroperoxide-containing structures. Other changes in the spectrum include the increase in intensity of m/z' 77 and 105 arising from easily ionized fragments of the oxidation products of polystyrene.

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Surface characterization of chemically modified chrysotile asbestos by particle‐induced desorption mass spectrometry

Bennett

Schweikert

Poisson

et al. 1990

Surface & Interface Analysis

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252Cf particle-induced desorptioa mass spectrometry (PDMS) bas been used to follow the modification of cbrytile asbestos fiber with organosilane compounds Monitoring changes in the peak area ratios of Si', Mg+ and SiOH* ions in PDM!3 and atomic ratios from XPS, tbe formation of organosiloxaw polymers vertical to tbe surface is suggested. Changes in the ratios also indicate f i r i n g coverages of the modifiers, owing in part to steric effects associated witb the differeat organic substituents Tbe fibrom, aon-conductive nature of tbe sample did not impair tbe analysis witb 252-Cf PDMS. This application lends furtber support to the belief that PDMS is a surface-sensitive tecbniqw.

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Compact time-of-flight mass spectrometer using particle-induced desorption

Cited by 23 publications

References 7 publications

The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides

The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides

Cf‐252 particle desorption mass spectrometry of photo‐oxidized polystyrene

Surface characterization of chemically modified chrysotile asbestos by particle‐induced desorption mass spectrometry

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Compact time-of-flight mass spectrometer using particle-induced desorption

Cited by 23 publications

References 7 publications

The Role of [M+O−] Centers (M+– Group IA Ion) in the Activation of Methane on Metal Oxides

The Role of [M+O−] Centers (M+– Group IA Ion) in the Activation of Methane on Metal Oxides

Cf‐252 particle desorption mass spectrometry of photo‐oxidized polystyrene

Surface characterization of chemically modified chrysotile asbestos by particle‐induced desorption mass spectrometry

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Product

Resources

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The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides

The Role of [M⁺O⁻] Centers (M⁺– Group IA Ion) in the Activation of Methane on Metal Oxides