Diffusion processes and atomic collisions of Na-rare gas systems studied by laser induced population grating method |
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| Affiliation: | 1. Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, Graz A-8010, Austria;2. Department of Physics, University of Karachi, University Road, Karachi 75270, Pakistan;3. Department of Physics, Islamia College Peshawar, KP, Pakistan;4. Institute of Space Science and Technology (ISST), University of Karachi, University Road, Karachi 75270, Pakistan;1. School of Physics and Electronic Information, Yan''an University, Yan''an 716000, China;2. Department of Mechanical Engineering, College of Engineering, Kyung Hee University, Yongin 17104, South Korea;3. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea |
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| Abstract: | Diffusion processes and atomic collisions of Na-He and Na-Ar systems have been studied by measurement of the time development of population gratings (Laser-Induced Population Grating; LIPG) induced in atomic levels by two intersecting resonant laser pulses and monitored through the Bragg diffraction of a probe laser beam. The diffusion process in the systems was observed through the decay of the LIPGs in the sodium ground-state sublevels. The pressure dependence of the diffusion constants were measured. The values showed rough agreement with the previously reported values which had been measured indirectly by the optical-pumping method. The gaussian process model and a simple collision kernel model were considered for the diffusion process. It was also found that with increasing buffer-gas pressure, the population gratings in the excited state were transferred to , which was interpreted as an effect of fine-structure state-changing collisions. |
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