研究目的
Investigating the complex multiple structures generated in carbon laser produced plasmas (C-LPP) during the expansion phase and understanding the formation of the main CN dominant structure and of lateral “?aps” with dominant C2 emission.
研究成果
The study revealed a transition from a mostly atomic plasma to a molecular one with increasing background pressure, where C2 and CN are responsible for the majority of the optical emission. The formation of complex plasma structures and the dynamics of individual plasma components were characterized, providing insights into the synthesis of new carbonaceous materials with advanced properties.
研究不足
The study is limited by the range of background pressures investigated (1.4 Pa to 660 Pa) and the specific laser fluence used (10 J/cm2). The mechanisms leading to the formation of complex carbon nanostructures in laser ablation plumes are yet to be completely understood.
1：Experimental Design and Method Selection:
The study employed complementary optical diagnosis techniques including ICCD fast camera imaging and space-and time-resolved optical emission spectroscopy to investigate the dynamics and chemistry of carbon laser produced plasmas (C-LPP).
2：Sample Selection and Data Sources:
The experiments were conducted on graphite targets (99.99% purity) in air, with the pressure inside the chamber varied from 1.4 Pa up to 660 Pa.
3：99% purity) in air, with the pressure inside the chamber varied from 4 Pa up to 660 Pa.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A second harmonic (λ = 532 nm) of a 10 ns Nd: YAG pulsed laser (Brilliant EaZy) was used for ablation. The plasma plume emission was monitored by an intensi?ed ICCD camera: PI-MAX3, 1024i with a gate time of 30 ns, and optical emission spectroscopy measurements were performed using a Princeton Instruments Acton 2750 system with a resolution of 0.02 nm.
4：02 nm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser ablation plasma plume emission was recorded starting with delays from 50 ns up to 20 μs, with respect to the laser pulse. The global emission spectra were recorded from a 600 μm wide plasma volume centered on the main expansion direction in a 300–700 nm spectral range.
5：Data Analysis Methods:
The kinetic and thermal energies of the resulted atoms, ions and molecules were investigated using the Boltzmann plot and Stark broadening approaches.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
