Efficiency of formation and detection of charge-stripped monatomic ions

Guilhaus, Michael; Kingston, R. G.; Brenton, A.G.; Beynon, J. H.

doi:10.1016/0168-1176(85)87043-9

Cited by 6 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This seems a remarkably close agreement in view of the fact that in the present work, charge stripping of polyatomic neutral species and not of atomic ions is studied, as well as the energy balance of the reaction being lower than the range covered in Ref. 34.…”

Section: Cross-section Of Charge Stripping Of Acetone Neutralssupporting

confidence: 87%

“…Using the equation and parameters given in Ref. 34, we have calculated the cross-section for the charge stripping of acetone neutrals on He and Ar targets, and these were only about 10 times smaller than the values obtained experimentally. This seems a remarkably close agreement in view of the fact that in the present work, charge stripping of polyatomic neutral species and not of atomic ions is studied, as well as the energy balance of the reaction being lower than the range covered in Ref.…”

Section: Cross-section Of Charge Stripping Of Acetone Neutralsmentioning

confidence: 82%

See 1 more Smart Citation

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Vékey¹,

Brenton²

1988

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

applied, even in the submonolayer region, might therefore be interpreted as a competition between adsorption of molecules to nitroceliulose and self-association. The effect discussed was found to be particularly strong for insulin, which is known to cluster easily,' but could also be observed for the other two molecules studied. These studies will continue with attempts to replace the electrosprayed nitrocellulose backings with smooth spin-coated Substrates and the use of ellipsometry to measure the actual amount of protein on the nitrocellulose surface after adsorption and rinsing. Charge stripping of a neutral acetone beam, C3H60, produced by the unimolecular fragmentation of a proton-bound dimer by the reaction [(C,H6O),H]+--tC3H,0+IC,EII,O]', was studied for various target gases.The singly-charged acetone ions, formed after charge stripping of the neutral acetone beam, contained a significant amount of internal energy (dependent on the collision gas), and its distribution was measured. Collision cross-sections, total and partial, were measured for charge stripping of acetone neutrals. Comparison of the present results with electron-transfer processes was also made.

show abstract

Section: Cross-section Of Charge Stripping Of Acetone Neutralssupporting

confidence: 87%

Section: Cross-section Of Charge Stripping Of Acetone Neutralsmentioning

confidence: 82%

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Vékey¹,

Brenton²

1988

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

“…In this respect, it is particularly important that the cross section of charge stripping drastically decreases with increasing ionization energy. 29 As a consequence, even minor contributions of electronically excited monocations in the precursor beam can result in substantially underestimated Q min values, 30 for which Fe + generated by CI of Fe(CO) 5 /N 2 O/H 2 O is an example. Notwithstanding, we have no indications for the presence of excited states for the FeO m H n + cations examined in this work (see below) and assume that these undergo efficient thermalization in the CI plasma.…”

Section: Resultsmentioning

confidence: 99%

“…Electronic excitations of the monocations have dramatic effects, however, because ionization of excited monocations is energetically easier than that of the ground states by the amount of the state splitting (provided that the dication ground state is accessible from both monocation states). In this respect, it is particularly important that the cross section of charge stripping drastically decreases with increasing ionization energy . As a consequence, even minor contributions of electronically excited monocations in the precursor beam can result in substantially underestimated Q min values, for which Fe + generated by CI of Fe(CO) 5 /N 2 O/H 2 O is an example.…”

Section: Resultsmentioning

confidence: 99%

Second Ionization Energies of Gaseous Iron Oxides and Hydroxides: The FeO_mH_n²⁺ Dications (m = 1, 2; n ≤ 4)

2000

View full text Add to dashboard Cite

The energetics of selected dicationic iron oxides and hydroxides FeO m H n 2+ (m = 1, 2; n ≤ 4) are probed by charge-stripping mass spectrometry in conjunction with ab initio calculations employing the B3LYP/6-311+G* level of theory. Specifically, Fe+, FeO+, FeOH+, Fe(H2O)+, [Fe,O2,H2]+, (H2O)FeOH+, and Fe(H2O)2 + and their respective dications are examined. In most cases, reasonable agreement between experiment and theory is found, and discrepancies can be attributed to interferences in the experimental study. Nevertheless, some shortcomings of the theoretical approach are obvious. Combination of experimental and theoretical results leads to adiabatic ionization energies of the monocationic iron compounds: IEa(FeO+) = 18.3 ± 0.4 eV, IEa(FeOH+) = 17.0 ± 0.4 eV, IEa(Fe(H2O)+) = 14.3 ± 0.5 eV, IEa((H2O)FeOH+) = 15.6 ± 0.5 eV, and IEa(Fe(H2O)2 +) = 12.6 ± 0.4 eV. In the case of [Fe,O2,H2]+, structural isomerism and isobaric interferences give rise to a composite charge-stripping peak and prevent the experimental determination of the ionization energy. Interestingly, the computational results suggest a reversed order of stabilities for the mono- and dicationic [Fe,O2,H2]+/2+ isomers, i.e., Fe(OH)2 + > (H2O)FeO+ > Fe(H2O2)+ versus Fe(H2O2)2+ > (H2O)FeO2+ > Fe(OH)2 2+. The ion energetics are used to assess the effects of ligation on the stabilities of the iron dications. While the covalent Fe−O and Fe−OH bonds decrease with increasing oxidation state of the metal, the interactions with water are dominated by electrostatic contributions. On average, solvation by water lowers the second ionization energy of the iron compounds studied by as much as 1.6 ± 0.3 eV

show abstract

“…I t is well known th a t artefact peaks of various kinds can arise when using apparatus such as this (Lacey et al 1981). By using the double-focusing combination (magnet plus first electric sector) to select the beam of precursor ions (Ar2+), and by scanning the second electric sector (Rabrenovic et al 1983) to obtain the translational energy spectrum, all such artefacts are removed (Guilhaus et al 1985a). The spectra obtained by using this procedure in the present work are not shown here, as they were of poorer effective energy resolution than those shown in figure 1.…”

Section: General Features Of Translational Energy Spectramentioning

confidence: 99%

Charge stripping and delayed autoionization in doubly charged ions of the noble gases

Singh

Boyd

Harris

et al. 1985

Proc. R. Soc. Lond. A

View full text Add to dashboard Cite

Doubly charged ions of each of the rare gases neon, argon, krypton and xenon, formed by electron impact and accelerated through 6 kV in a double-focusing mass spectrometer, are ionized to the corresponding triply charged ions via processes of at least two general kinds. The first proceeds under collision-free conditions, and can be attributed to delayed (microsecond) autoionization. An alternative explanation involving transitions from high Rydberg states, induced by the 350 K black-body radiation within the analyser vacuum housing, cannot be entirely ruled out. Other ionization processes require a collision with a molecule of collision gas, and result in a measurable loss of translational energy. In this paper the knowledge of analogous processes of the corresponding singly charged ions is reviewed, the general features of the translational energy spectra are established, and effort is devoted to the characterization of the collision-free process. The collision-induced processes have been interpreted in terms of known metastable states of the doubly charged ions.

show abstract

Efficiency of formation and detection of charge-stripped monatomic ions

Cited by 6 publications

References 12 publications

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Second Ionization Energies of Gaseous Iron Oxides and Hydroxides: The FeO_mH_n²⁺ Dications (m = 1, 2; n ≤ 4)

Charge stripping and delayed autoionization in doubly charged ions of the noble gases

Contact Info

Product

Resources

About

Efficiency of formation and detection of charge-stripped monatomic ions

Cited by 6 publications

References 12 publications

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Product excitation in collision‐induced dissociative ionization of acetone: Internal energy distribution

Second Ionization Energies of Gaseous Iron Oxides and Hydroxides: The FeOmHn2+ Dications (m = 1, 2; n ≤ 4)

Charge stripping and delayed autoionization in doubly charged ions of the noble gases

Contact Info

Product

Resources

About

Second Ionization Energies of Gaseous Iron Oxides and Hydroxides: The FeO_mH_n²⁺ Dications (m = 1, 2; n ≤ 4)