Laser-Induced Spectroscopy of Graphene Ablation in Air

22nd International Conference on Spectral Line Shapes

Witte, M.J.^1 ; Parigger, C.G.^1

University of Tennessee, Space Institute, 411 B.H. Goethert Parkway, Tullahoma

TN

37388, United States^1

关键词: Delta-V;    Laser induced;    Local thermodynamic equilibrium;    Molecular band;    Plasma emission;    Stark broadenings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/548/1/012052/pdf
DOI  :  10.1088/1742-6596/548/1/012052

来源: IOP

【 摘 要 】

Carbon Swan spectra are observed following laser ablation of graphene in laboratory air. Previous experiments showed temperatures that ranged from 4500 to 7500 K for the Δv 0 transition and 4200 to 4500 K for the Δv -1 transition for time delays on the order of 1.6 μs to 70 μs. This experiment explored in greater detail time delays > 10 μs for both molecular bands. Temperatures were found to be similar, ranging from 4500 to 6700 K for the Δv 1 transition and 3200 to 5500 K for the Δv -1 transition. Investigation is also made into spatially resolving the plasma emissions along the slit height. In addition, efforts are made to investigate the applicability of the local thermodynamic equilibrium (LTE) assumption. Comparisons are discussed in view of previous work that utilized Stark broadening of the Hβline, confirming LTE for delays