The dependence of the directly bonded coupling constants ¹J on some atomic and structural parameters (e.g. atomic order, electronegativity and length of bond etc.) has been investigated in small molecules (ions) It was found that there was a homologous series linear relationship between the proportional coefficient k of the calculated formula and the sum ∑Z' of the effective electronic number of individual atoms in molecules This relationship can be used to the estimation of coupling constants. The calculated result of 46 coupling constants in 34 compouds shows that there is a better agreement between the calculated and the experimental results only with few exceptions.

The principle and method for calculating directly bonded coupling constants ¹J has been extended to the calculation of geminal coupling constants ²J in small molecules (ions). The calculated result of 10 hydrides and 14 fluorides shows that there is a better agreement between the calculated and the experimental results only with few exceptions

The principle and method for calculating geminal coupling constants ²J has been extended to the calculation of three bonds coupling constants ³J and long range coupling constants ⁴J,⁵J……in hydrocarbon molecules. The calculated result of 57 coupling constants in 20 compouds shows that there is a better agreement between the calculated and the experimental results only with few exceptions

In this paper, the effect of various substituents on ¹H and ¹³C NMR chemical shift in some a-naphthyl derivatives has been investigated. We discovered that the ranges of the ¹H and ¹³C NMR chemical shift for each position are changed with the different values of substituent electronegativities E_y^x and substituent constants σ.Thus the relationship between the chemical shift and substituent electronegativity and substituent constant has been discussed.
The experimental results show that the bonding states and structures of naphtyl derivatives may be identified by measuring the ¹H and ¹³C NMR chemical shift and the substituent behavior as well.

The branch structures of three kinds of star-type branched SBS block copolymer which were prepared by using different Chloro-Si-Ianes Coupling Agents, were determinted by comparing the ¹H and ¹³C-NMR of them with those of their hydrogenated samples. The sequence structure of four arm star-type branches SBS was studied by ¹³C-NMR.

Two Sequences of spin-echo Fourier transform (SEFT) experiments with proton decoupling are achieved by FT-80A spectrometer with which ¹³C NMR Spectra can be simplified and C, CH, CH₂ CH₃ carbon resonances can be assigned. Their applications to pure hydrocarbon compounds and aromatic mixtures from petroleum are discribed and compared with simple off-resonance decoupling assignment techniques.

The microwave transient experimental technique is a new efficient method for studying rotation relaxation processes of gas molecules. In this paper the experiments of transient absorption, transient emission and multipulse series in the coherent transient microwave spectroscopy are introduced and how to use these experiments to measure rotation relaxation times T₁ and T₂ of gas molecules are also discussed.

In this article, a survey of some new developments and trends in the techniques of electron spin resonance (ESR) in recent ten odd years is described. Since the discovery of ESR in 1944, these techniques have been improving uninterruptedly From the electronic methods, as the use of computers for ESR data acquisition, the replacement of klystrons by solid state sources, the substitution of maser by FET microwave amplifier and other recent advances are briefly discussed.
As a result of the theoretical developments in magnetic resonance, the methods to improve the sensitivity and resolution in ESR are not only by the use of electronics, but also by the application of physical methods. For example, the multiple ESR techniques, the time domain ESR techniques and three-dimentional plot techniques are also reviewed in short.
Finally, the further developments of ESR techniques are expected by the author, and the selected bibliography is given.