Measurement of chemical equilibrium with the mass spectrometer and the influence of residual gases

Babeliowsky, T.

doi:10.1016/0031-8914(62)90060-5

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Influx of residual gases with partial pressures in the µPa region or lower may hence either prevent complete deoxidation of the sample studied, cause slight oxidation, or lead to steady-state conversion of entering O 2 , H 2 O, etc. into effusing metallic oxides [80,81]. In highpressure systems, gas dynamic flow generally precludes such effects.…”

mentioning

confidence: 99%

High-temperature mass spectrometry: Instrumental techniques, ionization cross-sections, pressure measurements, and thermodynamic data (IUPAC Technical Report)

Drowart

Chatillon

Hastie

et al. 2005

Pure and Applied Chemistry

234

184

View full text Add to dashboard Cite

An assessment of high-temperature mass spectrometry and of sources of inaccuracy is made. Experimental, calculated, and estimated cross-sections for ionization of atoms and inorganic molecules typically present in high-temperature vapors are summarized. Experimental cross-sections determined for some 56 atoms are generally close to theoretically calculated values, especially when excitation–autoionization is taken into account. Absolute or relative cross-sections for formation of parent ions were measured for ca. 100 molecules. These include homonuclear diatomic and polyatomic molecules, oxides, chalcogenides, halides, and hydroxides. Additivity of atomic cross-sections supplemented by empirical corrections provides fair estimates of molecular cross-sections. Causes of uncertainty are differences in interatomic distances and in shapes of potential energy curves (surfaces) of neutral molecules and of molecular ions and tendency toward dissociative ionization in certain types of molecules. Various mass spectrometric procedures are described that render the accuracy of measured thermodynamic properties of materials largely independent of ionization cross-sections. This accuracy is comparable with that of other techniques applicable under the conditions of interest, but often only the mass spectrometric procedure is appropriate at high temperatures.

show abstract

mentioning

confidence: 99%

High-temperature mass spectrometry: Instrumental techniques, ionization cross-sections, pressure measurements, and thermodynamic data (IUPAC Technical Report)

Drowart

Chatillon

Hastie

et al. 2005

Pure and Applied Chemistry

234

184

View full text Add to dashboard Cite

show abstract

“…Babeliowsky (27) studies the vaporization of wires made of several elements as a function of temperature. He also studies measurements of chemical equilibrium with the mass spectrometer and of the influence of residual gases (26). Babeliowsky and Boerboom (29) obtain the heats of vaporization of CaO and Ta and find them to be 147 ± 14 kcal./ mole and 153 ± 13 kcal./mole, respectively.…”

Section: Ionization and Dissociation Processesmentioning

confidence: 99%