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951.
This work describes a groundbreaking process that provides a direct highly localized measurement of the atomic mass on surfaces at room temperature. Employing an original system that joins a scanning tunneling microscopy (STM) device and a time of flight (TOF) mass analyzer, we could previously ionize surface atoms by the combination of an optical laser pulse and an electric pulse at the STM tip. Desorbed ions from a localized area were accelerated and detected by a TOF chamber. We will demonstrate in this paper that high localization and mass discrimination can be obtained even without the aid of an electric pulse from the tip. We reduced the angle of incidence of the laser beam to zero (laser beam parallel to the sample surface). In this condition we were able to demonstrate for the first time ionic desorption at a confinement level of the order of 5-10nm, an order of magnitude better than previous configurations.This paper was originally presented at the 11th Optical Near Field Workshop, which was held on June 28, 2002 at Tokyo Institute of Technology, Yokohama, organized by the Optical Near Field Group of the Optical Society of Japan, an affiliate of the Japan Society of Applied Physics.  相似文献   
952.
Using the theory of random closed sets, we extend the statistical framework introduced by Schreiber(11) for inference based on set-valued observations from the case of finite sample spaces to compact metric spaces with continuous distributions.  相似文献   
953.
梁芳营  青心  钟玉荣  丁双红 《物理学报》2003,52(10):2584-2588
利用超导体的金兹堡_朗道理论第一方程对超导体的特性作一些探讨研究.从理论上得出金兹 堡_朗道的载荷有效质量m也可以为负,在理论上得到超导能量以及超导体电流密度和超导自 由能与温度、载荷密度的具体表达式,并且可以拟合实验结果. 关键词: 超导电性 电流密度 载荷密度  相似文献   
954.
955.
High-spin states of 137La have been investigated with the reaction 130Te(11B, 4n) at a beam energy of 50MeV. The level scheme of 137La has been expanded with spin up to 33/2ℏ. Several new bands have been found in this nucleus. A band crossing in the band based on the 17/2- level has been observed at a rotational frequency of ℏω ∼ 0.48MeV. From systematic comparison, this band crossing probably originates from the alignment of protons. One of the bands with strong M1 transitions is proposed as a collective oblate band ( γ ∼ -60°).  相似文献   
956.
Lu  Z.  Ding  Y.  Xu  Y.  Yao  Z.  Liu  Q.  Lang  J. 《Journal of Thermal Analysis and Calorimetry》2002,70(3):985-994
Thermal analysis on two new heterometallic sulfide clusters, [PPh4]2[WS3(CuBr)3]2 and [PPh4]2[MoS3(CuBr)3]2 (where PPh4=tetraphenyl phosphonium, =pentamethylcyclopenta- dienyl), was carried out using a simultaneous TG-DTA unit in an atmosphere of flowing nitrogen and at various heating rates. Supplemented using EDS method, their thermal behavior and properties, together with the composition of their intermediate product, were examined and discussed in connection with their distinctive molecular structure as a dianion, which provided some theoretically and practically significant information. Both clusters decomposed in a two-step mode, but without a stable new phase composed of Mo/W-Cu-S formed during their decomposition process as we expected. Based on TG-DTG data, four methods, i.e. Achar-Brindley-Sharp, Coats-Redfern, Kissinger and Flynn- Wall-Ozawa equation, were used to calculate the non-isothermal kinetic parameters and to determine the most probable mechanisms. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
957.
LetE andF be Hilbert spaces with unit spheresS 1(E) andS 1(F). Suppose thatV 0 S1(E) →S 1(F) is a Lipschitz mapping with Lipschitz constantk=1 such that −V 0[S 1(E)] ⊂V 0[S 1(E)]. Then V0 can be extended to a real linear isometric mappingV fromE intoF. In particular, every isometric mapping fromS 1(E) ontoS 1(F) can be extended to a real linear isometric mapping fromE ontoF.  相似文献   
958.
MPT-X是带4个内导体坏的托卡马克装置。本文用差分法计算了MPT-X磁偏滤器的平衡磁面位形。结果表明,迭加上各种强度的八极场都能形成磁偏滤器位形,形成电流的放电中心区域随八极场的增加而收缩。还模拟了从多极器运行模式向托卡马克的过渡。  相似文献   
959.
On strictly separating vectors and reflexivity   总被引:5,自引:0,他引:5  
It is shown that the set of strongly disjoint pairs of strictly separating vectors for an operator space is open, and an operator subspace having a strongly disjoint pair of strictly separating vectors is reflexive. Some applications are discussed.  相似文献   
960.
本文讨论的两个时偶问题涉及来一个泊松过程与一个更新过程穿越时间和更新数的联合分布.利用向量马氏过程方法得到了这些联合分布的变换,给出了一个与分布均值有关量的数值结果.  相似文献   
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