Citation: WANG Feng, ZHANG Yue, ZHANG Yun-Hong. Penetrating Depth of Laser Focus in a Spherical Droplet during Confocal Raman Measurements[J]. Acta Physico-Chimica Sinica, ;2011, 27(04): 769-773. doi: 10.3866/PKU.WHXB20110402 shu

Penetrating Depth of Laser Focus in a Spherical Droplet during Confocal Raman Measurements

1.
1. Department of Chemistry, School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, Henan Province, P. R. China;
2. Institute of Chemical Physics, School of Science, Beijing Institute of Technology, Beijing 100081, P. R. China

Received Date: 31 December 2010
Available Online: 24 February 2011
Fund Project: 国家自然科学基金(20973001, 20903036)资助项目 (20973001, 20903036)

In this paper we attempt to establish a theoretical model to deal with the laser focusing problem during confocal Raman measurements within a spherical droplet. A depth penetration formula was deduced and the actual penetrating depth of the laser focus in a spherical droplet was related to the vertical moving distance of a Raman spectrograph′s platform. The results indicate that a nonlinear correlation exists between the platform′s moving distance and the moving distance of the laser focus. The moving distance of the laser spot is equal to the moving distance of the platform when the laser focus is located at the surface or at the center of the droplet. However, the moving distance of the laser spot is found to be longer than the moving distance of the platform when the laser is focused at the zone between the surface and the center. Therefore, spatial distribution information for the MgSO₄ droplet gel structure can be obtained according to the above-mentioned conclusion. We found that the gelation of an MgSO₄ droplet under low relative humidity (RH) was a shell structure with a certain thickness and this thickness was closely related to the relative humidity of the local environment.
- Confocal Raman,
- Penetrating depth,
- Spherical droplet,
- Laser focus,
- Gel strucutre,
- Magnesium sulfate
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