光电子成像研究AgOCH3-和Ag-(CH3OH)x (x=1, 2)

用光电子成像技术和从头算法研究Ag^-(CH₃OH)_x (x=1, 2)和AgOCH₃^-. 从AgOCH₃^-振动分辨的光电子谱得 到AgOCH₃^-的绝热和垂直电离能分别为1.29(2)和1.34(2) eV. Ag^-(CH₃OH)_{1,2相似文献}   

C60离子束撞击固体表面的坍塌与沉积(II)扫描隧道显微研究

Mass-selected C60 beam produced by laser ablation was accelerated and bombarded the (0001) surface of highly oriented pyrolitic graphite and (111) surface of gold single crystal. The samples were characterized by STM. The STM images showed that, the deposited species collapsed and formed planar structure on the solid surface, but the collapsed species were not dissociated and well oriented on the surface. Both positive and negative C60 ions were observed in the desorption mass spectra, confirming that the species collapsed on the solid surface are still the C60 clusters.     

C_(60)离子束撞击固体表面的坍塌沉积(Ⅰ)共焦显微拉曼光谱研究

为了研究C60的结构特性，我们最近在实验中将加这后的C60离子束沉积在固体表面，对其沉积后的形态进行了共焦显微拉曼光谱的表征．在记录的光谱中已检测不出C60原有的特征谱问，说明C60离子在高速憧击固体表面后，已经完全失去了原有的球状构型．C60的t）［R实验在自制的串级飞     

小型高分辨电子轰击离子源反射式飞行时间质谱仪的研制

常用的气体分析质谱仪使用四极杆质谱作为分析器,分辨率一般低于300,无法解决同质量数离子带来的干扰问题.本实验自行研制了一种小型高分辨气体分析质谱仪,它采用电子轰击离子源反射式飞行时间质量分析器.仪器腔体总长45 cm,在m/z 28的位置,质量分辨率达到3000(Full width at half maximum,FWHM),实现了CO和N2的半峰谷分离;在m/z 69的位置,仪器分辨率达到5000(FWHM).在直接大气压进样条件下,可以检测到空气中136Xe(含量7.8 μ g/m3)和80Kr(含量2.8 μg/m3).使用ADC采集时,仪器的动态范围为1 06.该仪器将作为高端气体质谱仪,应用于过程监测在线分析、环境有机挥发物研究、热分析质谱及催化反应监测等领域.     

反射式飞行时间质谱仪结合纳升电喷雾电离源研究金属簇合物

An experiment facility has been set up for the study of metal cluster compounds in our laboratory, which consists of a nano-electrospray ionization source, an ion transmission and focus system, and a reflectron time-of-flight mass spectrometer. Taking advantage of the nano-electrospray ionization source, polyvalent ions are usually produced in the “ionization” process and the obtained mass resolution of the equipment is over 8000. The molecular ion peaks of metal cluster compounds [Au₂₀(PPhpy₂)₁₀Cl₂](SbF₆)₄, where PPhpy₂=bis(2-pyridyl)phenylphosphine, and [Au₆Ag₂(C)L₆](BF₄)₄, where L=2-(diphenylphosphino)-5-methylpyridine, are distinguished in the respective mass spectrum, accompanied by some fragment ion peaks. In addition, the mass-to-charge ratios of the parent ions are determi-nated. Preliminary results suggest that the device is a powerful tool for the study of metal cluster compounds. It turns out that the information obtained by the instrumentation serves as an essential supplement to single crystal X-ray diffraction for structure characterization of metal cluster compounds.     

紫外光诱导光电子发射负离子源的阈值光电子成像仪设计 (cited: 2)

设计了一套紧凑的光电子成像装置,它包括解离式光电子贴附负离子源、垂直安装的高分辨阈值光电子速度成像装置和线性飞行时间质谱仪．紫外光辐射金属表面诱导低能光电子发射,再通过低能电子贴附超声分子束产生高强度和冷的负离子源．结合这种负离子源和飞行时间质谱-光电子成像仪装置,仪器的质量分辨能达到200左右,能量分辨优于3%(即对1 eV动能的电子,分辨达到30 meV)．此外,使用该实验装置获得了CH₃S^-和S₂^-在611.46 nm下的低能阈值光电子成像结果．同时得到了CH₃S和S₂的更精确的电子亲和势分别为1.8626±0.0020和1.6744±0.0035 eV．初步的结果证明了该装置对研究阈值光电子成像精确测量光电子亲和势非常有效     

C_(60)离子束撞击固体表面坍塌沉积物的拉曼光谱研究

Ｃ６０离子束撞击固体表面坍塌沉积物的拉曼光谱研究唐紫超任斌黄荣彬田中群郑兰荪（固体表面物理化学国家重点实验室厦门大学化学系厦门３６１００５）ＣｏｌａｐｓｅｄＤｅｐｏｓｉｔｉｏｎｏｆＡｃｃｅｌａｔｅｄＣ６０ＢｅａｍｏｎＳｏｌｉｄＳｕｒｆａｃｅｓ——Ｃ...     

固体酸催化条件下碳纳米管的形成

将正丁烯在不含金属微粒的催化剂上热解产生了碳纳米管．所用的催化剂是固体酸的氟促进的γ－Ａｌ２Ｏ３和分子筛型的ＨＺＳＭ－５．实验发现，这些固体酸催化剂热解产生碳纳米管所需的温度较低，碳纳米管的产生与催化剂的酸度和酸性位有一定的关联，而且所产生的碳纳米管的结构形态也比较独特．