Journal
PHYSICS OF PLASMAS
Volume 29, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0090155
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Funding
- DOE/NNSA Office of Defense Nuclear Nonproliferation Research and Development (DNN RD)
- Pacific Northwest National Laboratory is a multi-program national laboratory
- U.S. Department of Energy [DE-AC05-76RL01830]
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The temporal evolution of atoms and molecules in a laser-produced plasma from metal targets was investigated using optical emission spectroscopy. The results showed that the partial pressure of O-2 strongly influences spectral features and molecular formation in laser-produced plasmas.
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 O-2 (partial pressures up to asymptotic to 20%) to an N-2 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 O-2 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.& nbsp;& nbsp;Published under an exclusive license by AIP Publishing.
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