Electron, chemical, and thermal ionization mass spectra of alkali halides

Bencsath, F. A.; Field, F. H.

doi:10.1021/ac00295a005

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Mass spectrometric analysis of the desorbed ions has shown that only M + ions are desorbed in the ionization of the MX salts . Bencsath and Field reported that thermal ionization mass spectra consist solely of the alkali cations . Roehl and Spangler also reported only (H 2 O) n (N 2 ) m Na + and (H 2 O) n (N 2 ) m K + reactant ions in their work on alkali emissive sources .…”

Section: Resultsmentioning

confidence: 99%

Thermal Ionization Ion Mobility Spectrometry of Alkali Salts

Tabrizchi

2003

Anal. Chem.

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Positive and negative thermal ionization ion mobility spectra (TI-IMS) of some sodium and potassium halides are reported here. The data provide the first measurement of the thermal ionization ion mobility spectrometry of inorganic compounds. A thin Nichrome filament was used as a thermionic ionization source. Sample was directly deposited on the filament, where it was heated and ionized. Each salt produced a different ion mobility pattern, but all sodium salts spectra were common in their first peak. This peak differs from the common peak observed in the spectra of potassium salts. The drift time of the second peak in all spectra was found to be linearly dependent on the size of the counteranion of the salt. Negative thermal ionization ion mobility spectra of alkali halides were also observed. An alkali halide salt (MX), in general, produced its own anion as well as some heavier ions that are thought to be hydrated X- (MX)n species. The capability of the method in quantitative analysis was demonstrated by measuring potassium impurity in sodium bromide. A detection limit of 0.01% K+ in NaBr and a linear rage of 3 orders of magnitude were obtained. The results from this study suggest that TI-IMS has potential as a field technique for the detection of some elements in samples.

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Section: Resultsmentioning

confidence: 99%

Thermal Ionization Ion Mobility Spectrometry of Alkali Salts

Tabrizchi

2003

Anal. Chem.

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“…Bencsath et al reported that thermal ionization mass spectra consist solely of alkali cations [38]. Roehl and Spangler also reported only hydrated Na + and K + reactant ions in their work on alkali emissive sources [25].…”

Section: Resultsmentioning

confidence: 99%

An alkali ion source based on graphite intercalation compounds for ion mobility spectrometry

Tabrizchi¹,

Hosseini²

2008

Meas. Sci. Technol.

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A variety of alkali cation emitters were developed as the ion source for ion mobility spectrometry. The cation emitters were constructed based on alkali ion graphite intercalation compounds (GICs). The compounds were prepared by fusing alkali salts with ground graphite. In order to produce alkali ions, the compounds were loaded on a filament and heated to red. Reactant ions of the form alk+ ions were observed for the alkali salts NaCl, KCl⋅LiCl, CsCl and SrCl. In addition to Na+ ions, K+ ions were observed at the beginning of thermionic emission from Na-GIC. This is due to the low ionization potential of potassium that exists in trace amounts in sodium salts. In addition to the potassium ion, Na+ was observed in the case of LiCl salt. The Na+ and K+ peaks originating from impurities totally disappeared after about 40 min. However, the thermionic emission of the main ion of the corresponding salt lasted for several days. No negative ions were observed upon reversing the drift field. Selected organic compounds (methyl isobutyl ketone, dimethyl sulfoxide, acetone and tetrahydrofuran) were also ionized via alkali cation attachment reaction. Distinct ion mobility patterns were observed for different substances using one type of alkali reactant ion. However, the ion mobility pattern for a given substance changed when a different alkali reactant ion was used. Ammonia and amines were not ionized when this source was used.

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“…It has been clarified that the ionic species are considerably hard to be desorbed compared with neutrals even for alkali metals with low-ionization potential [2]. As to compounds, the surface ionization from alkali-metal halide deposited on metal substrates has relatively been well investigated [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. According to these previous works, it is generally accepted that the desorption temperature of alkali-metal ions is higher than that of neutrals.…”

Section: Introductionmentioning

confidence: 99%

Ion Desorption from Bulk Cesium Chloride at Moderate Temperature (< 500°C) under Electric Field

Baba

Shimoyama

2018

e-J. Surf. Sci. Nanotech.

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Desorption of positive ions as well as neutrals from bulk cesium chloride has been investigated in the moderate temperature (< 500• C), which is lower than its melting point (645 • C). At this moderate temperature range, neutral Cs was slightly desorbed, but desorption of Cs + ions was not observed. On the other hand, when the positive potential was applied to the sample, Cs + ions were desorbed with abnormally high intensity. The ratio of the desorbed ions to neutrals (I Cs + /ICs) showed a maximum at around 415• C. Based on the analysis using the Saha-Langmuir model, the observed high Cs + desorption yield under electric field was interpreted by the changes in the surface work function caused by the phase transition of CsCl. The abnormally high Cs + desorption yield at such low temperature under electric field would be applied to various fields such as ion production in accelerator and separation of cesium from complex systems through dry process.

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Electron, chemical, and thermal ionization mass spectra of alkali halides

Cited by 5 publications

References 17 publications

Thermal Ionization Ion Mobility Spectrometry of Alkali Salts

Thermal Ionization Ion Mobility Spectrometry of Alkali Salts

An alkali ion source based on graphite intercalation compounds for ion mobility spectrometry

Ion Desorption from Bulk Cesium Chloride at Moderate Temperature (< 500°C) under Electric Field

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