| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 95 === Our planetary system is composed of the collapse of dense molecular cloud, and the dense molecular cloud is composed of gases and sub-micrometer sized grains. In the low-temperature environment in the outer space, gases form into ice on the grains. Therefore, we choose H2O as our research material. In addition, we studied the spectrum of D2O ice and were able to understand the difference in spectrums of isotopes.
We applied the techniques of super-high vacuum and low temperature. In a low-temperature environment (28K) and low-pressure (3*10-9 Torr) environment, we made the ice grow using the thin film technique. Then we used different incident ions (H+、H2+、H3+) to simulate the energetic charged particles in the solar wind. Finally we studied the signals emitted during the collision in the range 300nm~500nm of visible light. In doing so, we are able to see the effect of charged particles to the evolution of the ice.
Using Gaussian fitting to analyze the spectrums we got, we found that by hitting H2O and D2O ice with H+、H2+、H3+ we got OH( 310nm、437nm )、H2O( 380nm、420nm )、H2( 465nm ) and H-Balmer( 433nm、485nm )。
Moreover, with the same incident energy of different ions H3+、H2+、H+, we can find the intensity of signals in sequence: H3+>H2+>H+.
Furthermore, from the results we could ascertain the effect that the intensity of signals from D2O ice is higher than that from H2O.
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