Laser ion source via direct ionization at the outlet of a helium jet

Ren-Cheng, Shang; Sida, Xu; Zhang, Wei; Rong, Yi; Zhang, Shuming; Ye, Zi-Piao; Zhizheng, Zhao; Yixiao, Luo

doi:10.1063/1.1148236

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The use of lasers in the production of ion beams, whether by resonance ionisation or ablation, has been demonstrated in many applications, see e.g. [1][2][3][4][5][6][7][8][9]. Ions may be produced in vacuum, or at higher pressures with different species of ambient gases [10].…”

Section: Introductionmentioning

confidence: 99%

“…An alternative method, presented here, is to shift the laser position on the target with the final reflection into the vacuum chamber, using a highprecision motorized kinematic mirror mount. ORCID(s): 0000-0001-7065-4446 (K. Murray); 0000-0002-3131-8148 (T. Brunner) 1 Now at Université de Montreal 2 Now at ASRC JAEA, Ibaraki, Japan 3 Now at University of Amsterdam 4 Now at TRIUMF…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a Spatially Resolved Multi-Element Laser Ablation Ion Source

Murray,

Chambers,

Chen

et al. 2021

Preprint

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A laser ablation ion source (LAS) is a powerful tool by which diverse species of ions can be produced for mass spectrometer calibration, or surface study applications. It is necessary to frequently shift the laser position on the target to selectively ablate materials in a controlled manner, and to mitigate degradation of the target surface caused by ablation. An alternative to mounting the target onto a rotation wheel or − translation stage, is to shift the laser position with a final reflection from a motorized kinematic mirror mount. Such a system has been developed, assembled and characterized with a two axis motorized mirror and various metal targets. In the system presented here, ions are ablated from the target surface and guided by a 90 degree quadrupole bender to a Faraday cup where the ion current is measured. Spatially resolved scans of the target are produced by actuating the mirror motors, thus moving the laser spot across the target, and performing synchronous measurements of the ion current to construct 2D images of a target surface which can be up to 50 mm in diameter. The spatial resolution of the system has been measured by scanning the interfaces between metals such as steel and niobium, where it was demonstrated that the LAS can selectively ablate an area of diameter ≈50 m. This work informs the development of subsequent LAS systems, that are intended to serve as multi-element ion sources for commercial and custom-built time-of-flight mass spectrometers, or to selectively study surface specific regions of samples.

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