准分子laser诱导一氧化二氯在石英玻璃中的光吸收及氯分子能量转移激发单线态氧发光
Optical absorption of excimer laser-induced dichlorine monoxide in silica glass and excitation of singlet oxygen luminescence by energy transfer from chlorine molecules
摘要：
在F_2激光辐照（光子能量= 7.9eV）的同时含有填隙O_2和Cl_2分子的合成石英玻璃中，发现了填隙一氧化二氯分子的光吸收带，其峰位为4.7eV，半宽为0.94eV。除了固有的缺陷，该OA带可以有助于从SiCl 4生产的二氧化硅玻璃的日晒。虽然ClClO的形成通过其拉曼特征得到证实，但其结构异构体ClOCl也可能有助于这种诱导的OA带。在300 C和400 C之间的该带的热破坏几乎完全恢复了间隙Cl 2的照射前浓度。一个额外的弱OA带在3.5 eV暂时分配给二氧化氯分子。在3eV-3.5eV激发下观察到激发态单线态O2分子的1272 nm强禁戒红外发光带，表明光激发三重态Cl 2向O2的能量传递过程。能量传递最可能发生在位于SiO2玻璃网络结构中相邻纳米间隙空隙中的Cl 2和O2间隙分子之间。
英文摘要：
An optical absorption (OA) band of interstitial dichlorine monoxide molecules with peak at 4.7 eV and halfwidth 0.94 eV is identified in F2 laser - irradiated (photon energy=7.9 eV) synthetic silica glass bearing both interstitial O2 and Cl2 molecules. Alongside with intrinsic defects, this OA band can contribute to solarization of silica glasses produced from SiCl4. While the formation of ClClO is confirmed by its Raman signature, its structural isomer ClOCl may also contribute to this induced OA band. Thermal destruction of this band between 300C and 400C almost completely restores the pre-irradiation concentration of interstitial Cl2. An additional weak OA band at 3.5 eV is tentatively assigned to ClO2 molecules. The strongly forbidden 1272nm infrared luminescence band of excited singlet O2 molecules was observed at 3 eV-3.5 eV excitation, demonstrating an energy transfer process from photoexcited triplet Cl2 to O2. The energy transfer most likely occurs between Cl2 and O2 interstitial molecules located in neighboring nanosized interstitial voids in the structure of SiO2 glass network.
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