Oxidation in laser-generated metal plumes

Elizabeth J. Kautz, Mark C. Phillips, Alla Zelenyuk, Sivanandan S. Harilal

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The temporal evolution of atoms and molecules in a laser-produced plasma was investigated using optical emission spectroscopy for several metal targets (i.e., Al, Ti, Fe, Zr, Nb, and Ta). Plasmas from metal targets were generated by focusing 1064 nm, 6 ns pulses from an Nd:YAG laser. Gas-phase oxidation/plasma chemistry was initiated by adding O2 (partial pressures up to ≈20%) to an N2 environment where the total background pressure was kept at a constant 1 atmosphere. Temporally resolved emission spectral features were used to track the gas-phase oxidation. The dynamics of atomic and molecular species were monitored using space-resolved time-of-flight emission spectroscopy. Our results highlight that the partial pressure of O2 strongly influences spectral features and molecular formation in laser-produced plasmas. Atoms and molecules co-exist in plasmas, although with different temporal histories depending on the target material due to differences in thermo-and plasma chemical reactions occurring in the plume.

Original languageEnglish (US)
Article number053509
JournalPhysics of Plasmas
Volume29
Issue number5
DOIs
StatePublished - May 1 2022

ASJC Scopus subject areas

  • Condensed Matter Physics

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