Cross Sections for Ionization by Electrons

Lampe, F. W.; Franklin, J. L.; Field, F. H.

doi:10.1021/ja01580a007

Cited by 219 publications

(82 citation statements)

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“…Our results are, on the whole, in agreement with those of Lampe et al (2), but they fit neither a simple additivity postulate nor a simple correlation with molecular polarizability.…”

Section: Introductionsupporting

confidence: 79%

“…More recently, Lampe, Franklin, and Field (2) have reported cross sections, determined in a similar manner, which are, in many cases, in disagreement with the values reported by Otvos and Stevenson. Further, Lampe et al (2) showed that the postulate of additivity did not fit their data but rather suggested that the cross sections were linearly related t o the polarizability of the neutral molecule.…”

Section: Introductionmentioning

confidence: 69%

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Total Cross Sections for Ionization by Electron Impact

Harrison¹,

Jones²,

Gupta³

et al. 1966

Can. J. Chem.

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“…Our results are, on the whole, in agreement with those of Lampe et al (2), but they fit neither a simple additivity postulate nor a simple correlation with molecular polarizability.…”

Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 69%

Total Cross Sections for Ionization by Electron Impact

Harrison¹,

Jones²,

Gupta³

et al. 1966

Can. J. Chem.

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“…Comparable deviations were observed for hetero-nuclear high-temperature molecules. For the magnesium dihalides [177] as for a number of organic molecules [171,178], a correlation between cross-sections and polarizabilities was noted.…”

Section: Ionization Cross-sections Of Moleculesmentioning

confidence: 96%

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

227

184

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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.

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“…We have assumed that in fact the ionization gauge cross-section of di-iodobenzene is likely to be much higher than for nitrogen; for example toluene ionization gauge cross-section is 6.4 times greater than nitrogen [31] while benzene has an ionization gauge cross-section that is a factor of 3.5 [31] to 5.7 [32] greater than nitrogen. Based on the ionization cross-sections of these similar molecules, we have assumed that the ionization gauge sensitivities for di-iodobenzenes are in the region of q = 6, though higher values might well be possible.…”

Section: Apparent Sticking Coefficientsmentioning

confidence: 99%