The one-color resonant two -photon ionization technique is employed to study jetcooled van der Waals(vdW) complex o-xylene?N2 through the S0-S1 transition around the band. The spectra obtained exhibit rich information about the complex intermolecular vdW vibrational modes. We have tentatively assigned all the observed spectral features. The structure of the complex has been obtained by calculation of the minimum energy structure.

 The concept of force titration was firstly proposed based on the technique of Chemical Force Microscopy (CFM). Self-Assembled Monolayer (SAM) on substrate surface can be titrated with buffer solutions at a nanometer scale by measuring the adhesion force between the SAM-modified substrate and probe tip. The plot of adhesion force vs pH value was termed as force titration curve. As an example, the titration behavior of w-mercaptoundecanoic acid monolayer on ld has been studied. It was found that there is a big hump around pH 5~6 in its force titration curve. Taking the contact angle titration result together, an interaction model for the monolayer was suggested from the chemical hysteresis point of view.

 Laser induced fluorescence excitation spectroscopy has been used to determine the previously ambiguous assignments of A-state stretching frequencies of CF2 radical under supersonic free jet conditions. The measured frequencies are v’1=1012.1±0.5cm-1, v’3=1180.2±0.5cm-1, which is in od agreement with Cameron's[6] calculation result. Furthermore, some transitions attributed to the (1,n-2,0)←(0,0,0), n≦6 progressions are first reported, and new parameters are derived from the spectra obtained.

 The geometries and fundamental vibrational frequencies of trans-and C2v- nitrous acid have been determined by ab initio calculations at the MP2 level with 6-31G** and 6-311+G** basis sets. The calculation results satisfactorily reproduce the experimental structural and vibrational spectral features of trans-HONO. Calculations at the same levels indicate that the C2v-HNO2 is also a stable conformer of nitrous acid. The calculated frequencies of C2v-HNO2 are in od agreement with the matrix infrared spectral features.

 Nano-fibre which was prepared by the polymerization of acetylene over nano-Cu particle catalyst was heated to cause the phase-transfomation in vacuum by means of two different processings. The result of TEM showed that the morphology before and after the transformation was fibred. The IR spectra illustrated that the products obtained from this two different processing were different. In the first processing breaking of chains and carbonation of nano-fibre occured, with the increasing of temperature the resistance of the product gradually decreased and conductive nano-fibre was obtained above 700℃. The XRD analysis showed that the crystallinity of the product was raised. The high conductivity of the product was probably due to the conjugate π-bond structure as well as the existence of free electrons of nano-Cu particles. In the second processing the product was only partially carbonated. This was because the small molecules in the breaking of nano-fibre chains which not exhausted out and the free radicals recombined each other. The conductivity of the product also illustrated this point. 

The photoionization and photodissociative ionization processes of m-nitroaniline (CeH6N2O2) have been investigated with synchrotron radiation (SR). The ionization potential (IP) of m-nitroaniline and the appearance potentials (AP) of the ionic fragments from the SR dissociative photoionization of C6H6N2O2 have been measured. Based on the IP(C6H6N2O2), AP(C6H6N+) and the related molecular formation enthalpies, D0(O2N-C6H6N+ )and △Hf(C6H6N+) have been evaluated. The mass spectrum of C6H6N2O2 obtained with SR photoionization has been presented. The most possible channels of dissociative photoionization have been discussed.

The photoionization processes of van der Waals (vdW) cluster ArHCl in a molecular beam have been investigated by using synchrotron radiation light source and photoionization mass spectrometer. The results show that the concentration of the ArHCl dimer is approximately given by the equation: α(ArHCl)%=1.79×10-8po1.5. The PIE curve of ArHCl has been given for the first time. The appearance potential of ArHCl+ is determined to be 12.52±0.03eV. Using the IP values of HCl obtained in our experiment, the bond dissociation energy of ArHCl+ is deduced to be 0.22±0.03eV. The theoretical calculations using Gaussian-94w indicate that the value is about 0.16eV. When Ar in the cluster is ionized, the intensity of ArHCl+ is obviously lower than that expected. It indicates that the charge transfer and dissociation processes have taken place in the system.

On a home-made crossed ion-molecular beam tandem time-of-flight mass spectrometer, carbon cluster ions with two hetero-atoms, CnSH± and CnS2±, were produced from laser ablation, mass-selected, and collided with pulsed nitrogen beam. From mass analysis of the fragment ions, structures of the cluster ions were characterized as linear, with two hetero-atoms locating on both ends of the carbon chain. The experimental results also revealed the main dissociation channel of the cluster ions. According to the results, for most cluster ions studied in the experiment, the weakest bond is the C-C bond next to the sulfur atom, but in some smaller cluster ions, S-C bond is easier to break. Under the experimental condition, cluster ions may suffer multiple collisions, so fragment ions produced from stepwise dissociation process were observed.

The kinetics of formation reaction of Zn(Ⅱ)、 Cd(Ⅱ)、 Hg(Ⅱ) with metamethyl tetraphenylporphyrin (H2T(m-CH3)PP) in acetone and Zn(Ⅱ) with tetraphenylporphyrin (H2TPP) in acetone or in DMF have been studied. A general mechanism was proposed and the kinetic parameters were obtained by non-linear least-squares program. The different behavior of the reaction system of Zn(Ⅱ)、 Cd(Ⅱ)、 Hg(Ⅱ) have been interpreted reasonably. The effects of temperature and solvent on the reaction rate were also investigated in this paper.

Adsorption and activation of small molecules NO, CO and CO+ NO on LaSrCuO4,La2CuO4 and La1.7Th0.3CuO4 which are typical samples in the sence of nonstoichiometric oxygen(λ) anrong the series of La2-x(SrTh)xCuO4±λ mixed oxide catalysts were studied by means of MS- TPD (TPSR ), XRD, chemical analysis and so on. It was shown that the adsorption amount of NO can be correlated with the content of oxygen vacancy while the types and strength of adsorption of NO could be related to the oxidation state of the metallic ion. It was also found that CO molecule was first converted into CO32- and then desorbed in the form of CO2 at high temperature during the adsorption and desorption of CO on the mixed oxide with oxygen vacancy. The fact that the profiles of TPD(TPSR) of NO in co-adsorption of NO+CO and in single NO adsorption are similar shows that the adsorption of NO molecule not only has some priority to that of CO but also is stronger than that of CO. It seems that the adsorption of NO plays a dominate role in the activation and decomposition of NO.

 The enol contents and equilibrium constants of the keto-enol tautomerism of ethyl acetoaretate were determined in various solvents using UV spectroscopy. It was found that in supercritical CO2 the enol content decreases dramatically in the presence of 0.047mol?L-1 ethanol. In liquid cyclohexane, however, the effect of the same amount of ethanol on enol content is not detectable. The strong cosolvent effect in SC CO2 results from the clustering of the cosolvent around the solute.

 The Characteristics of the action of Na2SeO3 on Rhizopus nigrocans has been studied by means of microcalorimetry, the relationship between growth rate constants and the concentration of Na2SeO3 is
k=0.03608exp[-0.003608(c+8.60)2]
It was found that Na2SeO3 of low concentration has promoting action on the growth of Rhizopus nigrocans cells, and high concentration of Na2SeO3 has inhibitory action. The study has provided a lot of information on the bioaffect of selenium and the research of toxicology.

The dissolving potential of anode, the flatband potential, the open-circuit photovoltage and the spectrum-response of ZnSe/GaAs/ aqueous electrolyte system have been investigated. This kind of composite semiconductor photoelectrode is enable to raise the efficiency of solar energy conversion.

In the TCNQ-modified BLM, the voltammetric response is different due to the different methods used to prepare the membrane forming solution. The direct and indirect dissolved methods result in irreversible and reversible responses respectively. These results can be explained by the different styles of the orientation of TCNQ in the membrane. The reversible response is controlled by the diffusion of electroactive species in the interior of the membrane. When MB is used to modify the BLM, very complex voltammograms are obtained. The intersection of the voltammetric curves can be regarded to be owing to the appearance of new phase in the membrane caused by MB. But it disappears at lower scan rate. Peak current increases with decreasing scan rate. This indicates that the resistance of the membrane at lower scan rate is lower than that at higher scan rate. Asymmetric curve of MB incorporated BLM is ascribed to the different rates of redox reaction at the two membrane/solution interfaces.

 The prerequisite of covering of aluminum hydrous oxide, obtained by the hydrolysis of acidic alumimum salts in the present of urea, on pre-existing spheric polystyrene particles is that surface of pre-existing particles must be modified by anionic surfactants. Meanwhile, modifiers also accelerate the hydrolysis of aluminum salt, which will induce independent nucleation of aluminum hydrous oxide. Therefore, in order to prevent the formation of aluminum hydrous oxide particles, the amount of surface modifier should be correctly contolled.

The studing results on the characteristics of the energy migration of excited state by fluorescent probe method are reported. The energy migration is of ligation between Eu3+,Tb3+and AQ in acetone solution.
It is found that the excited state ligation is formed between AQ and Eu3+, Tb3+ in acetone solution. There is obvious energy migration phenomenon between ligand AQ and centre ions Eu3+, Tb3+. AQ migrates the absorbed photoenergy to Eu3+, Tb3+ and made Eu 3+, Tb3+ emit character fluorescence, and the fluorescence intensity is increasing greatly. In addition, through studing the effect of different solvents to AQ:Eu3+ system, it is found that if the solvent polarity is different, the effect to energy migration is different. The solvent with weak polarity is benifical to electric dipole transition migration of Eu3+, and the solvent with strong ploarity is favorable magnetic dipole transition migration.

The viscosity of polyethylene glycol-chitosan-H2O system at different compositions and its relevant systems were measured, and the intrinsic viscosity and Huggins parameters were obtained. The interaction parameter, kAB, was determined from Huggins parameters by simple summation, and another interaction parameter α, was calculated by non-summation technique. It is found that the parameters, kAB and α, change with the compositions in a similar style. The results show that the kAB value, as the same as the α value, can be used to predict the compatibility of polymers to each other.

SiC nanometer whisker, whose diameter was about 50nm and purity was 98.54%, was synthesized by microwave heating in an atmosphere of ar n. Char pyrolyzed phenolformaldehyde resin and SiO2 nanometer powder were used as starting materials. The properties of the whisker were determined by XRD and TEM. The mechanism for synthesizing SiC nanometer whisker was discussed.