Angle-resolved time-of-flight spectra of neutral particles desorbed from laser irradiated CdS |
| |
| Affiliation: | 1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China;2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Wenhai Road, Qingdao, 266237, China;3. College of Material Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Qingdao, 266590, China;1. College of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230039, PR China;2. Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, Anhui, 230601, PR China;3. Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Jianzhu University, Hefei, Anhui, 230601, PR China;4. School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, Anhui, 230601, PR China;5. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui, 230601, PR China;1. School of Material Science and Engineering, School of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, Shandong, China;2. Key Laboratory of Nanomaterials, Qingdao University of Science and Technology, Qingdao, 266042, Shandong, China;3. Key Laboratory of Applied Surface and Colloid Chemistry (SNNU), MOE, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi''an 710062, China |
| |
| Abstract: | ![]()
Angle-resolved time-of-flight spectra of neutral particles desorbed from laser irradiated CdS have been investigated with a pulse mass counting method. Three quantities to characterize the desorption dynamics — the desorption flux, the mean kinetic energy and the speed ratio — depend remarkably on the incident laser power and the ejection polar angle θ. The desorption flux is strongly peaked forward deviating from the cosine distribution. For low laser power, the desorbing S2 follows the same Maxwellian velocity distribution over the polar angles below 50°. For high laser power, the Maxwell distribution is limited to a narrow cone around the polar axis and with increasing polar angle the spectra of the velocity distribution become broader than the simulated Maxwellian one. With increasing laser power the mean kinetic energy increases for gq < 40°, while for θ > 40° it decreases abnormally. For these apparent breakdowns of the Maxwell law and Knudsen law, the dynamic behaviour of desorbing particles obeys a non-equilibrium thermal mechanism, which may involve a solid-gas phase transformation. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
