A crossed beam study of the multiple ionization of argon by electron impact

McCallion, P; Shah, M B; Gilbody, H B

doi:10.1088/0953-4075/25/5/017

Cited by 79 publications

(59 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5, the measured Y values of the nondissociated ions are plotted against those calculated from the crosssections reported in Refs 5,20,22,23. The consistency between the data points and the straight dashed line, which demonstrates excellent agreement between our data and that predicted using cross-section values from the literature indicates that the present instrument is effective for the application to ionization studies.…”

Section: Relative Ionization Cross-sectionssupporting

confidence: 69%

Kinetic‐energy‐sensitive mass spectrometry for separation of different ions with the same m/z value

et al. 2008

View full text Add to dashboard Cite

A double-focusing mass spectrometer (MS) equipped with a superconducting-tunnel-junction (STJ) detector has been applied to measure relative ionization cross-sections for the production of ions that are accompanied by different ion species with the same mass-to-charge (m/z) value. The STJ detector fabricated for this study enables kinetic energy (E) measurement of incoming individual ions at a counting rate of up to approximately 100 k ions/s and an energy resolution (DeltaE/E) of 15%. Both high counting rate and high-energy resolution are necessary to independently determine both m and z and not the m/z value only in ion-counting MS experiments. Ions such as (14)N(2) (2+) and (14)N(+) with the same m/z value can be clearly discriminated using a kinetic-energy-sensitive MS. This fine discrimination capability allows direct determination of relative ionization cross-sections of the homonuclear diatomic ions (14)N(2) (2+)/(14)N(2) (+) and (16)O(2) (2+)/(16)O(2) (+), which are difficult to measure due to the strong interference by the signals of their dissociated atomic ions with noticeably large ionization cross-sections. The new instrument requires no low-abundance heteronuclear diatomic molecules of the forms (14)N(15)N or (16)O(17)O to carry out ionization studies and thus, is expected to be useful in fields such as atmospheric science, interstellar science, or plasma physics.

show abstract

Section: Relative Ionization Cross-sectionssupporting

confidence: 69%

Kinetic‐energy‐sensitive mass spectrometry for separation of different ions with the same m/z value

et al. 2008

View full text Add to dashboard Cite

show abstract

“…For Zn, Cd, and Hg, the process was evidenced during determination of ionization efficiency curves near their thresholds [155]. A pulsed cross-beam technique incorporating time of flight spectroscopy [156][157][158][159][160][161][162][163][164][165][166] or related experimental procedures has been used since in additional studies of the ionization of several atoms.…”

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

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

“…Kr-85 emits a beta particle when it decays. The magnitudes of a cross section for electron impact to single ionize Argon peak at ~2.25 × 10 ିଵ cm 2 in the energy range of 50 to 200 eV and dramatically fall past 1 keV [6]. On average, Kr-85 emits in the 250 keV range.…”

Section: A Krypton-85mentioning

confidence: 99%

High power microwave surface flashover seed electron production methods

Thomas

Foster

Krompholz

et al. 2010

2010 IEEE International Power Modulator and High Voltage Conference

View full text Add to dashboard Cite

Surface flashover imposes a fundamental limitation to the magnitude of high power microwaves which can be radiated from the vacuum environment of the source into atmospheric conditions. Providing seed electrons through various methods allows for initiatory conditions to be more closely controlled and the delay time variations to be reduced so that developmental mechanisms can be more closely examined. The experiment uses a coaxial magnetron capable of producing a ~4.5 MW, 3 µs pulse, at 2.85 GHz propagating in the TE 10 mode. The pulse rise time measured at the window is reduced using a spark gap pulse steepening technique. The fast rise time pulse propagates through the dielectric into an atmospheric test chamber where various conditions such as gas pressure, type of gas, UV illumination, and charged particle creation by radioactive sources can be controlled. Previous research has shown the significant impacts of UV radiation on the delay time averages and statistical distributions. Surface distributed seeding sources and volume distributed sources will be discussed while the primary focus of this paper will address use of alpha radiation as an ionizing agent. Thus far, a reduction in average delay time by as much as 60% has been achieved at sub-microsecond time scales, which also significantly affected the width of the statistical distributions of the delay time. Alpha particles have a short penetration distance in air which makes them a good candidate for study since the number of electron-ion pars created along the path is large. Analysis of the alpha particles influences will be discussed along with a statistical analysis of breakdown delay in the presence of ionization.

show abstract

A crossed beam study of the multiple ionization of argon by electron impact

Cited by 79 publications

References 20 publications

Kinetic‐energy‐sensitive mass spectrometry for separation of different ions with the same m/z value

Kinetic‐energy‐sensitive mass spectrometry for separation of different ions with the same m/z value

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

High power microwave surface flashover seed electron production methods

Contact Info

Product

Resources

About