(2+1) resonant multiphoton ionization of photolytically produced CH radical yields previously unobserved bands arising from two-photon transition to Rydberg states. Analysing of the spectrum of CH+, three new states are identified. They are 8 d, 9 d and 10 d Rydberg states, respectively.

The dynamic surface band bending of cleaved InP(110) sample was investegated using in situ XPS analysis and the causes of band bending was discussed according to the experimental results. It was concluded that there is no intrinsic surface states in InP and neither the residual gas in UHV nor the X-Ray radiation causes the band bending, the band bending should be caused by the surface defects induced during the cleavage and lattice relaxation.

 The mechanism of the thermal reaction(800K/4.00-26. 66kPa) of propene producing methylcyclopentane has been studied theorecally by ab initio MO method at the level of UMP/ 3-21G. The results show that it is a three-step biradical reaction with L4-biradical and 1, 5-biradical as intermediates in sequence. The reaction pathway found in this article confirms the mechanism proposed by experimentalists.

 Pulse reaction and MS-TPSR (temperature programmed surface reaction, equipped with on line mass spectroscopy) techniques were employed to study the methanism of catalytic partial oxidation of methane to syngas over nickel catalysts. The deep oxidation of methane by lattice oxygen species to CO2 and H2O took place on NiO/Al2O3 catalysts, While on metallic nickel catalysts Ni0/Al2O3 methane activation followed the pyrolysis mechanism to produce H2 and surface carbon species Ni...C. The mechanism for methane partial oxidation should follow the direct oxidation route. Both methane and oxygen are activated on metallic nickel sites to form active surface species of Ni…C and Niδ+… Oδ-. H2 and CO are the primary products directly formed by the reaction of Ni…C with Niδ+…Oδ-.

 With increasing of n in CnH2n+1 OH, the lamellar liquid crystal region increases and W/O region moves upward in the three components phase diagram, and the maximum water content (molar fraction) solubilized in W/O region is constant but the molar ratio of CnH2m+1 OH/Igepal 520 decreases at maximum water content. The chain length of CnH2n+1 OH is n＞8 in the lamellar liquid crystal and n ＞10 in the W/O region.

The dynamic surface dilational properties of C12E8 aqueous solution were investigated by the damped longitudinal wave method. The comparison between the experimental resultant and the three adsorption models (diffusion controlled, adsorption-desorption controlled and mixted model) shows that bellow the cmc the adsorption and desorption rate is rapid and the rate of adsorption is controlled by the diffusional exchange between bulk and subsurface with the diffusion coefficient which is dependent on the concentration at lower concentration and independent of concentration at higher concentration. The effects of the increase of the limiting dilational modulus at high frequency and the characteristic frequency of relaxation when the concentration of C12E8 increase has been related to the restoration mechanism of surface tension gradient due to the stretched surface.

The effect of HCl content on the structural properties of the MCM-41 mesophase synthesized via the S+X-I+ assembly using cetylpyridinium bromide (CPBr) as the template and the tetraethylorthosilicate (TEOS) as silica source has been studied. It was found that with the decrease of TEOS/HCl ratio, the crystallinity, unit cell parameter and pore wall thickness of the MCM-41 silica increased, accompanied by the decrease in the mean pore size. While the efforts contributed to the template removal provided evidence that 100% of the CPBr encapsulated in the as-synthesized mesophase was recoverable by using acetone/water (1: 1 V/ V ) as the extractive agent. The mechanism for the formation of the titled mesophase, as well as the association of CPBr with the framework of the composite have also been discussed.

Using solvatochromic method the determination of the molecular first-order hyperpolarizabilities of three novel stilbazolium-like dyes and twoknown stilbazolium-like dyes: trans-(pyrrol-2yl) -4-(N-methyl-pyridinio) -stilbazolium iodide(PPSI), trans-(furan-2-yl) -4-(N-methyl - pyridinio)-stilbazolium iodide (FPSI), trans-(thiophene-2-yl) -4- (N-methyl-pyridinio)-stilbazolium iodide (TPSI) and trans-(N-methylpyrrol-2-yl) 4-(N-methyl-pyridinio)-stilbazolium iodide (MPPSI), trans(4-N, N-dimethylamino) -(4- N-methylpwidinio) -stilbazolium iodide(DAPSI) in 8 solvents is presented, and their molecular hyperpolarizabilities are as high as 10-26 -10-27 esu. We have proved that the molecular hyperpolarizabilities is in linear correlation with the electron excessivities of donors for PPSI,FPSI and TPSI in each solvent, this relation give us a way to design molecules that have larger hyperpolallzabilities. Furthermore, our experiments show that the molecules of the five stilbazolium-like dyes have...更多 a larger dipolemoment, when they are in ground state than in excited state.

Clusters with various sizes and compositions can be produced by laser ablation in high vacuum, but the formation mechanism of the clusters under given condition still remains to be understood. In this paper, a kinetic model of clusters formed from laser ablation was suggested with considering different experimental conditions such as abating laser power, backing pressure, expansion of the laser vaporized plasma, thermal radiation and etc., and numerical solution of the relevant kinetic equation was obtained. According to the calculation, about 8 × 10-9 mole of particals can be produced from each laser pulse and their initial pressure is about 1. 9×105 Pa. Mainly due to the diffusion of the particals, formation reaction of the clusters cannot succeed at 7. 85 μs of the ablation　laser pulse, but the yields of different cluster products reach their maxima at first 0. 4μs. On the whole, size distribution of the clusters is unvaried after 1. 5μs, so the formation reaction actually ends by that time.

The general dynamic features of the batch oxidation of Sulfur(-Ⅱ) compounds (S2-,thiosuifae, thiocynate and thiourea et al. ) were discussed. The changes of pH with reaction time consist of a rise and two separate drops. Dynamic model was proposed, further experimental studies on the batch oxidation of thiourea and thiocyanate by ClO2- were also carried out. Simulation curve was well consistent with experiment in a batch reactor.
Non-catalytic oscillation of peroxide (hydrogen peroxide, persulfate et al. ) - S(-Ⅱ)-compound system resulted from the nonlinear dynamic of sulfur oxidation. In the oxidation of S(-Ⅱ)-compounds by oxyhalogen compounds(ClO2 - et al. ), nonlinear dynamics of both oxyhalogen compound and sulfur compound should be considered simultaneously. So complex phenomena such as birhythmicity and chaos may be discovered.

The Cu/Co layer film on the semiconductor silicon was obtained by electrodeposition for the first time. The results of current - time transient curves and STM image showed that the wt of Cu film is two-dimensional while an island three-dimension growth for the Co film was formed. The addition of CrO3 changed the current - time transient curves, and affected the growth of crystal. The addition of CrO3 decreased the nucleation rate of Cu, while it changed the shape of current-time transient curves of the deposition of Co at higher deposition potentials. For the deposition of Co, addition of CrO3 can form the adhesive film [Co. xCr2O3' YH2O]ad or [CoOH. nCr(OH)3]ad, which decreased the nucleation rate of Co.

 On the theoretical basis of thermokinetics, a thermokinetic research method for simple order reactions - Characteristic time method has been proposed in this paper. The method only needs characteristic data of thermoanalytic curve tm, m. and A, and uses data processing on computer to give rate constant. In order to test the validity of this method, the saponificaion of ethyl butyrate and ethyl benzoate in aqueous ethanol solvent and the formation of hexamethylene tetramine in aqueous solution have been studied. The rate constants calculated with this method are in agreement with those in the literatures , and therefore, the characteristic time method for simple order reactions is believed to be correct.

Using polyvinyl alcohol(PVA) and sodium dodecyl sulfate(SDS) as the surfactants respectively, nano-size amorphous molybdenum dioxide powders were prepared by y-radiation method at ambient pressure and room temperature, and the products were characterized by use of laser Raman spectra(LRS), X-ray powder diffraction(XRD) and transmisson electron micrograph(TEM). The experimental results reveal that the relative pure satnples can be obtained using PVA as surfactant, and the average particle size is about 10nm, but using SDS as surfactant, the samples with the average particle size 30nm are a mixture of MoO2 and MoO3. This suggestes PVA is prior to SDS in the preparation of nano-sized amorphous molybdenum dioxide powders by γ-radiation method.

A new type of liquid membrane oscillator in which non-ionic surfactant is the key component was designed in a U type tube and monitored by a pair of Pt electrodes. The fundamental composition is 1. 0% emulsifier OP (aq) / n-butanol: nitrobenzene = 1: 5 (V/ V) /0. 5mol•dm-3 NaCl(aq). The molecular formula of emulsifier OP is C8H17 O(CH2CH2O) 10H. The mechanism and influence factors were studied by replacing component, changing concentration, adding additive, comparison between different experimental apparatus and auxiliary experiment. The oscillatory mechanism is repetitive formation and abrupt destruction of interface membrane of the surfactant, induced by hydrogen bond between n-butanol and emulsifier OP.

In this paper, the solid state. polymer thin films of 8-hydroxylquinoline aluminum (Alq3) were mad by spinning coat method. The fluorescence efficiencies and the luminescence spectra of them were measured via the laser systems. Various experimental factors were considered and tested. It was found that the peak wavelength of the luminescence spectra of the Alq3 polymer films shifted and that the purity of the samples affected its fluorescence efficiencies: the fluorescence efficiencies of impure samples were about three-fourth of that of the purified ones; fluorescence efficiencies of Alq3 doped in PMMA polymer was higher than that doped in PC and PEO. Under certain conditions, transparent thin film 10 layers can be achieved. This kind of polymer thin film of Alq3 exhibits well fluorescence response, but also has od stability . Spin coat method can greatly reduce the technical requirements comparing with the vacuum plating method.

The major reason of Al anode activation is that Ga can plate out on the aluminum surface and form activated points. The Al-Sn, Al - Ga binary alloys can't be activat6d in alkaline medium. During the dissolution of the Al - Sn - Ga ternary anode, Sn and Ga dissolove solution aions as ions. After Sn ions deposit on the surface of Al anode, Ga ions will underpotentially deposit on Sn. The higher activation of the polycomponent alloy anode is caused by much more new activated points being continually formed. The activation mechanism for the polycomponent Al-alloy anode in alkaline medium is abided by the" dissolution-deposition".