Langmuir probe measurements of potential inside a supersonic jet extracted from an inductively coupled plasma

Lim, H. B.; Houk, R. S.; Crain, Jeffrey S.

doi:10.1016/0584-8547(89)80099-0

Cited by 26 publications

(8 citation statements)

References 18 publications

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“…Thus, a small potential may be induced in the plasma from the voltage gradient down the load coil propagated through this gap. Such a potential can readily penetrate into the region between the sampler and skimmer, as shown by old Langmuir probe measurements [46]. As ions travel between the plasma and the sampler, or between the sampler and skimmer, they gain energy from the potential gradient and also collide with background Ar gas atoms.…”

Section: Suggested Causes Of Low Mar + Abundances: Collision-induced mentioning

confidence: 99%

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Witte

Houk

2012

Spectrochimica Acta Part B: Atomic Spectroscopy

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The abundance of metal argide (MAr + ) ions during laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is measured during ablation of pure samples of transition metals. As expected, the relative abundance of MAr + ions to M + ions for various elements increases as the dissociation energy (D 0 ) of the ion increases. Gas kinetic temperatures (T gas ) are determined from the calculated MAr + /M + ratios and are used to indicate the origins of MAr + ions. The determined T gas values are very high, 8000 K to ≥ 20,000 K, which indicate that MAr + ions are much less abundant in the mass spectrum than expected based upon plasma conditions. Collision-induced dissociation (CID) during the ion extraction process is suggested to be responsible for removal of MAr + ions. Factors responsible for these collisions are discussed.

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Section: Suggested Causes Of Low Mar + Abundances: Collision-induced mentioning

confidence: 99%

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Witte

Houk

2012

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…At any rate, further basic studies, such as measurement of matrix effects for analyte elements [36], Langmuir probe experiments [11,[37][38][39], and, possibly, spatially resolved measurements of ion density behind the skimmer [40], are necessary to fully elucidate the fundamental reasons for the analytical improvements seen in this study. For example, it is not even known whether the beneficial effects of floating the interface derive from changes to the plasma, to the supersonic jet between the sampler and skimmer, or to the beam leaving the skimmer.…”

Section: Discussionmentioning

confidence: 99%

Inductively Coupled Plasma Mass Spectrometry with an Electrically Floating Sampling Interface

Hauk

1993

J. Am. Soc. Mass Spectrom.

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In conventional inductively coupled plasma mass spectrometry devices, the sampler and skimmer are grounded. In this work, modest DC voltages (+ 10 to + 50 Vl are applied to either (or both) sampler and skimmer. Alternatively, the skimmer is biased, and the sampler is merely left floating. The latter arrangement improves sensitivity for Co(+) by sixfold, provides nearly the same molar sensitivity for CO(+), Rh(+), and Ho(+), and extends the upper end of the linear dynamic range to approximately 100 ppm. These changes to the interface do not affect the background perceptibly. The relationship between applied potential and the potential actually measured on the sampler and skimmer is also discussed.

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“…Other investigators have used Langmuir-probe analysis as a means of characterizing plasma [106,107] and interface [9] conditions. A floating Langmuir probe has been used to measure d.c. potentials of the ICP in two kinds of commercial ICP-MS instruments [106,107].…”

Section: Interface Studiesmentioning

confidence: 99%

“…The potential inside the supersonic jet in the first-stage vacuum region has been measured also. The potential in the jet varied with sampling position, plasma power, and nebulizer-gas flow and varied in the same way as the measured potential in the plasma [9].…”

Section: Interface Studiesmentioning

confidence: 99%

Fundamental and applied investigations in plasma-source mass spectrometry for elemental analysis

1991

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Langmuir probe measurements of potential inside a supersonic jet extracted from an inductively coupled plasma

Cited by 26 publications

References 18 publications

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Inductively Coupled Plasma Mass Spectrometry with an Electrically Floating Sampling Interface

Fundamental and applied investigations in plasma-source mass spectrometry for elemental analysis

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