An Rf-only ion funnel interface for ion cooling in laser ablation time of flight mass spectrometry

Querci, Lorenzo; Varentsov, V.; Günther, Detlef; Hattendorf, Bodo

doi:10.1016/j.sab.2018.05.004

Cited by 18 publications

(18 citation statements)

References 40 publications

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“…Here, the extraction of ions into high vacuum is performed with the use of an RF-only ion funnel placed on the axis downstream the nozzle exit. This approach to the ion beam extraction has been proposed in [12] and later it was further developed [13][14][15] and experimentally proven at ETH Zürich [16,17] and Stanford [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…The gas flow rate through the relatively large cross section of the annular nozzle throat demanded higher pumping speed in the RF-funnel chamber. In the second design [16,17] the laser had to be focused and aligned through the whole apparatus and through the nozzle reducing the freedom in the target design and limiting the reduction of the nozzle diameter. In the third design presented in this work the laser ablation is realized orthogonal to the nozzle and funnel axis allowing the laser ablation and ion extraction to be designed independently.…”

Section: Introductionmentioning

confidence: 99%

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Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

et al. 2020

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Laser ablation opens a material-independent method to produce ions from transition metals for laser spectroscopy. To overcome some drawbacks of this process, an ion source is under development at TU Darmstadt. A distinctive feature of this source is that ions are produced via laser ablation in presence of helium buffer gas where they stop and cool in the process of their collisions with the buffer gas atoms and are then extracted by the gas flow into low-pressure conditions through the supersonic nozzle. The compact RF-only funnel ion guide placed on the axis behind the nozzle exit allows for effective extraction of highquality ion beams into a pressure region below 10 −4 mbar. The extraction is realized by using the gas flow trough a supersonic nozzle and an RF-only funnel ion guide, followed by a second nozzle and an RF+DC funnel representing two differential pumping stages. The technical details of this laser ablation ion source are described and the results of the first tests with the RF-only funnel are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

et al. 2020

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“…An electrodynamic ion funnel has been suggested for the efficient ion collection and transportation into a mass analyzer under the ambient conditions of rarified (0.5-1 kPa) Martian atmosphere (Johnson et al, 2011). Another recent example is an RF-ion funnel for improved ion extraction in LIMS-TOF instrument with an orthogonal setup (Querci et al, 2018). In this setup, the sample is located in the chamber filled with a buffer gas (He).…”

Section: Li-tof-mss With Orthogonal Geometrymentioning

confidence: 99%

Laser Ionization Mass Spectrometry at 55: Quo Vadis?

Azov

Mueller

Makarov

2020

Mass Spectrometry Reviews

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Laser ionization mass spectrometry (LIMS) was one of the first practical methods developed for in situ analysis of the surfaces of solid samples. This review will encompass several aspects related to this analytical method. First, we will discuss the process of laser ionization, the influence of the laser type on its performance, and imaging capabilities of this method. In the second chapter, we will follow the historic development of LIMS instrumentation. After a brief overview of the first-generation instruments developed in 1960-1990 years, we will discuss in detail more recent designs, which appeared during the last 2-3 decades. In the last part of our review, we will cover the recent applications of LIMS for surface analysis. These applications include various types of analyses of solid inorganic, organic, and heterogeneous samples, often in combination with depth profiling and imaging capability.

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“…An ion passes through this hole into a converging-diverging nozzle that takes in high pressure, subsonic flow and outputs low pressure supersonic flow. This flow is passed through an RF-funnel which focuses Ba ++ and separates it from GXe and background impurities, and then passes it to an ion guide for further filtration [85] [86]. Next is a collision cell in which Ba ++ is converted into Ba+ by the following reaction,…”

Section: The Barium-tagging Line With the Capillary Methodsmentioning

confidence: 99%

“…Plots of the Reynolds number for GXe (left) and for LXe (right) when the capillary is designed to displace the maximum mass of fluid that can be pumped at the McGill University RF-Funnel[86].…”

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confidence: 99%

Background Reduction for Improved Sensitivity at the Enriched Xenon Observatory through advancements in Barium-Tagging Simulations, Prediction and Prevention of High-Voltage Breakdown in Liquid Xenon Time-Projection Chambers, and Event Classification using Ensemble Methods and Machine Learning

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Description of capture regions for various rest times in Scenario A. A rest time of 3 s corresponds to the capture region in Figure 6.11. The bolded region in the table marks the sub-regions the capture region for which a time-dependence on the capture radius has been observed. Ranges of z-coordinate are used for some entries to conserve space. *Because the maximum initial radial coordinate of Ba + ions was 7.0 mm, any capture radii labelled as 7.0 mm may actually be greater than 7.0 mm.. .. .. .. .. .. . .. 6.4 Description of capture regions for various rest times in Scenario C. The bolded region in the table marks the sub-regions the capture region for which a timedependence on the capture radius has been observed. The bolded region in the table marks the sub-regions the capture region for which a time-dependence on the capture radius has been observed. *Because the maximum initial radial coordinate of Ba + ions was 7.0 mm, any capture radii labelled as 7.0 mm may actually be greater than 7.0 mm.. .. .. .. .. .. . .. 6.5 Capture regions for the sub-regions of Scenario C with sub-regions defined in Figure 6.12. The different capture radii for equal z-coordinates demonstrates an angular dependence in capture probability for this scenario. Ranges of z-coordinate are used for some rows to conserve space. *Refer to Figure 6.12 for definitions of Inner Region and Outer Region headings. **Because the maximum initial radial coordinate of Ba + ions was 7.0 mm, any capture radii labelled as 7.0 mm may actually be greater than 7.

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An Rf-only ion funnel interface for ion cooling in laser ablation time of flight mass spectrometry

Cited by 18 publications

References 40 publications

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

Laser Ionization Mass Spectrometry at 55: Quo Vadis?

Background Reduction for Improved Sensitivity at the Enriched Xenon Observatory through advancements in Barium-Tagging Simulations, Prediction and Prevention of High-Voltage Breakdown in Liquid Xenon Time-Projection Chambers, and Event Classification using Ensemble Methods and Machine Learning

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