Basic study of High Efficiency Formation of O^- Anion Radical

原子氧自由基阴离子(O^-)的化学从基础和应用两个方面都很有趣。在基础方面，O^-的反应在电离层化学领域中是重要的。O^-在燃烧和等离子体化学领域也是不可忽视的。在应用方面，O^-是化学电离质谱学的关键试剂离子。O^-也适用于有机中间体负离子的合成，适用于有机中间体的结构和性质的研究。由于O^-即使在常温下也是一种强氧化剂，因此O^-将被用于化学气相沉积(CVD)技术以及NO、SO2和CO等大气污染的控制技术中。原因之一是过去还没有找到一种简便的气相中O^-的生产方法，在我们的研究中，我们发现O^-是通过在固体电解质和空间电极之间施加低电平直流电压而从固体电解质的电极表面喷射到气体中的O^-。一种实验装置被简单地设计成具有空间电极和作为氧离子导体的固体电解质。通过在电极之间施加约50V/cm的直流电压，观察到了离子电流。用Q-MASS(带四极杆的质量分析仪)改装成阴离子来鉴定100-200nA的离子电流含量。从质谱图上可以清楚地识别出电子和O^-。

The chemistry of an atomic oxygen radical anion (O^-) is interesting both from a basic and an application points of view.On the basic side, reactions of O^- are important in the field of an ionospheric chemistry. O^- also cannot be neglected in the field of a combustion and plasma chemistry. On the application side, O^- is a key reagent ion for the chemical ionization mass spectroscopy. O^- is as also useful for the synthesis of negative ion of organic intermediate speies which is appropriate for the study of the structure and characteristics of an organic intermediate. In future, O^- will be used in the CVD (Chemical Vapor Deposition) technology and also in the control technology of air pollution like NO,SO_2 and CO since O^- is a strong oxidizing agent even at the room temperature.In spite of these pieces of importance of O^-, the chemistry of O^- has not been developed significantly so far. One of the reason is that an easy and convenient production method of O^- in the gas phase has not been found in the past.In our study, we discovered that O^- was that ejected into the gas from the electrods surface of a solid electrolyte by applying a low level DC voltage between a solid electrolyte and a space electrode. An experimental apparatus was simply designed to have a space electrode and a solid electrolyte that serves as an oxygen ion conductor. By applying DC voltage of about 50V/cm between the electrodes, ion current was observed. Contents of ion current of 100-200nA was identified by Q-MASS (mass analyzer with a quadrupole) modified for anions. Electrons and O^- were clearly recognized from the mass spectrum.