臺灣大學: 化學研究所林金全陳順義Chen, Shun-YiShun-YiChen2013-04-112018-07-102013-04-112018-07-102010http://ntur.lib.ntu.edu.tw//handle/246246/257383Cavity ring-down spectroscopy (CRDS) is a relatively new and quite sensitive technique for the measurement of gas phase. It holds the potential for simple, direct and sensitive measurement of the concentrations of a variety of trace gases in the atmosphere. In this thesis, We used CRDS to detect I2 produced from photodissociation of CH2I2. We can confirm this primary dissociation channel by energy dependence and pressure dependence experiments. The vibrational population ratio was found to be v0:v1:v2=1:0.65±0.1:0.3±0.05 .The quantum yield for the I2 elimination reaction is determined to be 0.004±0.002. We propose I2 elimination may process through the electronic ground state by internal conversion. This hypothesis is supported by the result of temperature dependence experiment. Moreover, the results agree with a given theoretical calculation.4005481 bytesapplication/pdfen-US腔體震盪光譜法光解二碘甲烷碘分子單分子解離CRDSphotodissociationdiiodomethaneiodineunimolecular dissociationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/257383/1/ntu-99-R97223161-1.pdf