Study on the mechanism of periodic void generation in reactive dusty plasmas

我们研制了一种利用碘气体滤光片和CCD单色仪测量低频区拉曼散射的装置。通过保持在适当温度下的气体滤光片的散射光，使激光束的散射光强度降低到1/1000。然而，减少的幅度随着时间的推移而显著变化。其原因可能是激光头温度的稳定性。我们还利用一些霓虹气体的发射线对该单色仪的分辨率进行了检查，证实它具有足够的分辨率(1.7 cm-1)来测量拉曼散射。此外，通过考察合适的条件，我们成功地在乙炔等离子体中产生了尘埃颗粒。

We developed an equipment for measuring Raman scattering in a low-frequency region using an iodine gas filter and a CCD monochromator. The intensity of scattering light of a laser beam was reduced to 1/1000 by the scattering light passing through the gas filter kept under a suitable temperature. However, the magnitude of reduction significantly changed with time. The reason would be the stability of temperature of the laser head. We also checked the resolution of the CCD monochromator using some emission lines from neon gas and confirmed that it has an enough resolution (1.7 cm-1) for measuring the Raman scattering. In addition, we successfully produced dust particles in an acetylene plasma by examining suitable conditions.