Estimating measurement error values resulting from the peak position error,when using the Abel inversion and the numerical method in argon inductively coupled plasma diagnostics

In this study we calculate the measurement error values generated by the Abel inversion and the numerical method in Ar ICP diagnostics. We used a simple mathematical model to simulate the conditions in the Ar ICP. The results of this study indicated that the measurement errors increased with increasingly greater peak position error. The signal in the center had the highest measurement error values, and they decreased with the increase in the distance from the center. It is concluded that in order to keep measurement error values below 5%, the peak position error must be kept under 1.0% of the plasma diameter.     

基于2,5-噻吩二甲酸的钙(Ⅱ)和钡(Ⅱ)配位聚合物的合成、晶体结构及性质

在溶剂热条件下,合成了2个碱土金属配位聚合物[Ca（tdc）（DMF）₂]_n（1）和[Ba（tdc）]_n（2）（H₂tdc=2,5-噻吩二甲酸）,分别用元素分析、红外光谱、X射线单晶衍射、粉末衍射、热重分析和荧光光谱对它们进行了表征。结构分析表明,配合物1具有4,4连接的二维层状结构,拓扑符号为（4⁴·6²）,而配合物2呈现三维网络结构。固体荧光测试表明配合物1比配合物2具有更显著的荧光性能。     

Low energy laser photoelectron study of defect states on cleaved Si(111)2 × 1 surfaces

Step-associated surface defect states on good cleaved surfaces of Si(111)2 × 1 have been sensitively observed without a background of valence-band or intrinsic surface-state photoelectrons, by exciting with tunable laser photons below the valence photoemission threshold.     

A computer program for the collection,reduction and analysis of echelle spectra

This article is an electronic publication in Spectrochimica Acta Electronica (SAE), the electronic section of Spectrochimica Acta Part B (SAB). The hardcopy text, comprising the main article and an appendix, is accompanied by a disk containing the compiled program, a manual, the source code and tutorial in ASCII format, and data files. The work presented is a result of the need to facilitate collection, calibration, and extraction of data from an echelle spectrometer employing charge coupled array detection (CCD). A computer program, written using Microsoft's BASIC Professional Development System version 7.1 under MS DOS, is explained and demonstrated. Wavelength calibration requires critical spectrometer dimensions, grating counter settings, and the identification of a single spectral line. Calibration accuracies are better than ± 1 pixel across a 576 × 384 pixel array. Extraction of intensity-normalized spectra for all detected orders requires less than 3 min on a 33 MHz 80386 personal computer with an 80387 math coprocessor.     

Luminescence of Zn<Subscript>2</Subscript>L<Subscript>2</Subscript>- and PVC-based organic molecular compositions under photo- and electroexcitation

Spectral and luminescent properties of Zn₂L₂ complex {mu-2-bis((3-pyridine-2-il)-5-(2-salicyldeniminophenyl)-1,2,4-triaurum(2-))dizinc(2+)solvate with ethanol} are investigated in solutions, powder, and thin polyvinylcarbazole (PVC) films. The trends in their change versus the nature, aggregate state, and excitation method are established. Electroluminescence (λ_max = 493 nm) of an ITO/PEDOT/PVC: Zn₂L₂/LiF/CaMg/Ag device is excited, and its current-voltage and brightness-voltage characteristics are investigated.     

Biconjugate direction methods in Krylov subspaces

The paper addresses the orthogonal and variational properties of a family of iterative algorithms in Krylov subspaces for solving the systems of linear algebraic equations (SLAE) with sparse nonsymmetric matrices. There are proposed and studied a biconjugate residual method, squared biconjugate residual method, and stabilized conjugate residual method. Some results of numerical experiments are given for a series of model problems as well.