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Mass separated particle flux from a laser-ablation metal cluster source

Published online by Cambridge University Press:  11 September 2019

Yuta Ishikawa Open the ORCID record for Yuta Ishikawa [Opens in a new window] ,
Jun Hasegawa Open the ORCID record for Jun Hasegawa [Opens in a new window]  and
Kazuhiko Horioka Open the ORCID record for Kazuhiko Horioka [Opens in a new window]
Yuta Ishikawa*
Affiliation:
Tokyo Institute of Technology, Ookayama Meguro-ku, Tokyo152-8550, Japan
Jun Hasegawa
Affiliation:
Tokyo Institute of Technology, Ookayama Meguro-ku, Tokyo152-8550, Japan
Kazuhiko Horioka
Affiliation:
KEK, Tsukuba, Ibaraki305-0801, Japan
*
Author for correspondence: Yuta Ishikawa, Tokyo Institute of Technology, Ookayama Meguro-ku, Tokyo152-8550, Japan, E-mail: [email protected]
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Abstract

Flux waveforms of aluminum cluster beams supplied from a laser-ablation cluster source were precisely investigated under various source conditions such as background pressure, ablation laser intensity, and nozzle structure. A time-of-flight mass spectroscopy revealed that aluminum clusters with sizes up to 200 were generated and the amount of the clusters could be maximized by choosing a proper background pressure (~2 MPa) and an ablation laser fluence (~40 mJ/cm2). Flux waveforms of clusters having specific sizes were carefully reconstructed from the observed mass spectra. It is found that the pulse widths of the aluminum cluster beams were typically about 100 µs and much smaller than that of the monoatomic aluminum beam, indicating that the cluster formation was limited in a relatively small volume in the laser-ablated vapor. Introducing a conical nozzle having a large open angle was also found to enhance the cluster beam velocity and reduce its pulse width. A velocity measurement of particles in the cluster beam was conducted to examine the velocity spread of the supplied clusters. We found that the aluminum clusters were continuously released from the source for about 100 µs and this release time mainly determined the pulse width of the cluster beam, suggesting that controlling the behavior of an ablated vapor plume in the waiting room of the cluster source holds the key to drastically improving the cluster beam flux.

Keywords

Clusterlaser ablationmass spectrometrymolecular beam
Type
Research Article
Information
Laser and Particle Beams , Volume 37 , Issue 4 , December 2019 , pp. 324 - 331
Copyright
Copyright © Cambridge University Press 2019

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