Issue 10, 2022

Doppler splitting and expansion dynamics of laser-produced plasma plume under a high vacuum ambience

Abstract

The expansion behaviour and spectroscopic characteristics of laser ablation plumes under a high vacuum ambience (<10−1 Pa) have not been investigated to date. For isotope identification using resonance ionisation mass spectrometry combined with laser ablation, a time-resolved spectroscopic investigation of the laser-produced plasma plume is necessary as the direction of atomic motions affects spectral features upon resonance ionisation due to multi-stage electron transitions. In this article, laser absorption spectroscopic measurements were conducted for the ablated plasma plume generated from an Al2O3 target using a nanosecond-pulsed laser. Our study mainly highlights that (i) Doppler splitting appeared after the plume front passed because of the formation of the contact layer and quasi-cavity in the plasma plume and the movement of atoms in the lateral direction at a high vacuum (3.0 × 10−4 Pa), and (ii) the loss of ejected atoms due to the laser-produced plasma expansion amounted to 43% at 3.0 × 10−4 Pa. Moreover, the two-dimensional contour figure that showed the Doppler splitting zone can be used to visualise atomic motions in the vertical and lateral directions, making it a useful tool for isotope analysis by resonance ionisation mass spectrometry.

Graphical abstract: Doppler splitting and expansion dynamics of laser-produced plasma plume under a high vacuum ambience

Supplementary files

Article information

Article type
Paper
Submitted
22 May 2022
Accepted
30 Aug 2022
First published
31 Aug 2022

J. Anal. At. Spectrom., 2022,37, 2033-2041

Doppler splitting and expansion dynamics of laser-produced plasma plume under a high vacuum ambience

A. Kuwahara, K. Murakami, H. Tomita, K. Sawada and Y. Enokida, J. Anal. At. Spectrom., 2022, 37, 2033 DOI: 10.1039/D2JA00177B

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