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- Title
Dual-comb spectroscopy of ammonia formation in non-thermal plasmas.
- Authors
Sadiek, Ibrahim; Fleisher, Adam J.; Hayden, Jakob; Huang, Xinyi; Hugi, Andreas; Engeln, Richard; Lang, Norbert; van Helden, Jean-Pierre H.
- Abstract
Plasma-activated chemical transformations promise the efficient synthesis of salient chemical products. However, the reaction pathways that lead to desirable products are often unknown, and key quantum-state-resolved information regarding the involved molecular species is lacking. Here we use quantum cascade laser dual-comb spectroscopy (QCL-DCS) to probe plasma-activated NH3 generation with rotational and vibrational state resolution, quantifying state-specific number densities via broadband spectral analysis. The measurements reveal unique translational, rotational and vibrational temperatures for NH3 products, indicative of a highly reactive, non-thermal environment. Ultimately, we postulate on the energy transfer mechanisms that explain trends in temperatures and number densities observed for NH3 generated in low-pressure nitrogen-hydrogen (N2–H2) plasmas. Plasma-activated chemical transformations promise efficient syntheses of vital chemicals such as ammonia, however, reaction pathways are often unknown and quantum state-resolved information is lacking. Here, the authors use quantum cascade laser dual-comb spectroscopy to study non-thermal plasma-activated ammonia synthesis with rotational and vibrational state resolution, quantifying state-specific number densities via broadband spectral analysis.
- Subjects
NON-thermal plasmas; QUANTUM cascade lasers; LASER spectroscopy; CHEMICAL synthesis; CHEMICAL amplification; AMMONIA
- Publication
Communications Chemistry, 2024, Vol 7, Issue 1, p1
- ISSN
2399-3669
- Publication type
Article
- DOI
10.1038/s42004-024-01190-7