High‐temperature mass spectrometry and studies of ion‐ion, ion‐molecule, and molecule‐molecule equilibria

Sidorov, Lev N.; Журавлева, Лариса Владимировна; Sorokin, I.D.

doi:10.1002/mas.1280050104

Cited by 32 publications

(20 citation statements)

References 19 publications

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“…Since Br -ions can, along with other halide ions, be partially emitted from the surface of an effusion cham ber [17,18], the internal standard method [19,20] was used to determine formation enthalpy Δ f (Eu ) ( Table 2). According to this method, ion molecular exchange reactions with the participation of cluster ions formed directly inside effusion cell are studied.…”

Section: Formation Enthalpy Of Eu Ionsmentioning

confidence: 99%

Formation energies of molecules and anions of europium bromides

Бутман

Sergeev

Моталов

et al. 2012

Russ. J. Phys. Chem.

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The content of saturated vapors above europium dibromide and Eu-EuBr 2 , Eu-Ba-BaBr 2 , EuBr 2 -LaBr 3 systems is investigated by means of high temperature mass spectrometry in the electron ion ization and thermoionic emission regimes. On the basis of the measured equilibrium constants for reactions with participation of molecules and negative ions, the enthalpies of formation Δ f (kJ/mol) are deter mined using the method of the third law of thermodynamics: -59 ± 13 (EuBr), -349 ± 19 (EuBr 2 ), and -861 ± 24 (Eu ).

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Section: Formation Enthalpy Of Eu Ionsmentioning

confidence: 99%

Formation energies of molecules and anions of europium bromides

Бутман

Sergeev

Моталов

et al. 2012

Russ. J. Phys. Chem.

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“…Mass spectrometric studies in high-temperature chemistry, aimed at the determination of thermodynamic properties for condensed phases and for gaseous molecules, mostly make use of Knudsen effusion (see, e.g., [1][2][3][4][5][6][7][8][9][10][11][12][13][14]17,20,21,[24][25][26][27][28]) or of vapor transport supersonic molecular beam sampling methods (see, e.g., [15,19]) to generate the molecular beam that is to be analyzed with respect to the nature and the pressure of the gaseous chemical entities present in the cell containing the sample.…”

Section: Analysis Of Factors Determining Accuracymentioning

confidence: 99%

“…During this period, a number of review papers have appeared describing instruments and experimental procedures in high-temperature mass spectrometry (HTMS) . Synopses of the results have also been presented [3][4][5][6][8][9][10]14,17,18,[20][21][22][23][24][25][26][27][28]. Data obtained by this technique for individual compounds, whether gaseous or in the condensed phase, are incorporated in tabulations of dissociation energies [29][30][31][32][33][34][35][36][37][38], of thermodynamic properties [32][33][34][35][36][37][38], and of ionization potentials [30,39,40].…”

Section: Introductionmentioning

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

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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“…In view of this, Knudsen-cell mass spectrometry (KMS) is a convenient tool for studying their molecular and ionic compositions in the gas phase. In this work, this method is used in the so-called ion-molecule equilibrium (IME) approach [8], which was developed two decades ago through cooperation between the Moscow State University, Institute of High Temperatures (Moscow), and Ivanovo Institute of Chemical Technology. In addition to analysis of electron-impact-ionized neutrals, as in classic KMS, the KMS-IME approach deals with charged species in the saturated vapor over the compound being studied.…”

Section: Introductionmentioning

confidence: 99%

Formation of Gaseous Negative Ions of Fluoro and Trifluoromethyl Derivatives of C60 Fullerene Studied by Knudsen-Cell Mass Spectrometry

et al. 2005

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Experimental procedures are described for producing negative ions of fluoro and trifluoromethyl derivatives of C 60 in the vapor phase and characterizing them by Knudsen-cell mass spectrometry. Some common aspects of the formation of such ions are established, and the associated ion-molecule equilibria are investigated. Electron affinity data are presented for C 60 (CF 3 ) 2 n molecules. It is shown that, upon ionization, the fluorofullerenes tend to loose one or several fluorine atoms.

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High‐temperature mass spectrometry and studies of ion‐ion, ion‐molecule, and molecule‐molecule equilibria

Cited by 32 publications

References 19 publications

Formation energies of molecules and anions of europium bromides

Formation energies of molecules and anions of europium bromides

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

Formation of Gaseous Negative Ions of Fluoro and Trifluoromethyl Derivatives of C60 Fullerene Studied by Knudsen-Cell Mass Spectrometry

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