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Reaction Engineering for Laser Applications

激光应用的反应工程

基本信息

批准号：
12305051
负责人：
KODA Seiichiro
金额：
$ 27.33万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305051/
关键词：
Laser reaction engineering Lase application Laser material engineering Low temperature rare gas crystal Au particle Ice surface Vibrational relaxation Supercritical CO_2 レーザー反応工学レーザー光応用低温結晶多ホノン過程半導体コロイドエネルギー移動光増感反応

项目摘要

1. The objective of the present research is to construct a reaction engineering science for application of lasers, whose light has attractive features such as mono-chromaticity, high energy density, etc.2. Laser reaction engineering for novel reactions in solid phase : The IR spectra of hydrogen bonds of H_2S doped in rare gas low temperature crystals, and production of H atoms from the doped H_2S under pulsed laser irradiation were studied. The mobility and reactivity of the produced H atoms against the irradiation laser wavelength were studied. The photo-physical properties of the excited states of doped O_2 and N_2 in rare gas crystals were also studied. The observed slow relaxation rates implied that the doped O_2 and N_2 are effectively isolated in the crystal in the sense that no strong interaction between the doped and host molecules exists.3. Laser reaction engineering for initiating radical reactions in condensed phase : The photo-dissociation process of O_2 in supercritical CO_2 was studied under the UV laser irradiation. The mechanism for the lowering of the necessary energy to producing active oxygen species was established. The photo-irradiation can be used as the initiator of radical reactions in supercritical CO_2.4. Laser irradiation on interfaces : (1) Pulsed laser irradiation of Au ion, Au colloid and semiconductor solutions was studied. The irradiation caused photo-reduction, size change of colloidal particles, etc., whose mechanisms were discussed. A novel technique for preparing a recording medium by laser irradiation of colloids in gels was successfully proposed. (2) The photochemical process of adsorbed air-trace materials on ice surface was studied. The interaction of the adsorbed molecule and ice surface was found to affect the photochemical process.

1.本研究的目的是构建激光应用的反应工程科学，其光具有单色性、高能量密度等吸引人的特点。2．新型固相反应的激光反应工程：研究了稀有气体低温晶体中掺杂的H_2S氢键的红外光谱，以及脉冲激光照射下掺杂的H_2S生成H原子的红外光谱。研究了所产生的氢原子相对于激光照射波长的迁移率和反应性。还研究了稀有气体晶体中掺杂O_2和N_2激发态的光物理性质。观察到的慢弛豫速率表明掺杂O_2和N_2在晶体中被有效隔离，即掺杂分子和主体分子之间不存在强相互作用。 3．凝聚相引发自由基反应的激光反应工程：研究了紫外激光照射下O_2在超临界CO_2中的光解过程。建立了降低产生活性氧所需能量的机制。光照射可作为超临界CO_2.4中自由基反应的引发剂。界面上的激光照射： (1)研究了Au离子、Au胶体和半导体溶液的脉冲激光照射。辐照引起光还原、胶体颗粒尺寸变化等，并对其机理进行了探讨。成功提出了一种通过激光照射凝胶中的胶体制备记录介质的新技术。 (2)研究了冰表面吸附微量物质的光化学过程。研究发现吸附分子与冰表面的相互作用会影响光化学过程。