The ¹H and ¹³C NMR spectra of 9 firstly synthesized lariat Ethers containing pyridine were recorded. Individual peaks were assigned with empirical rules, DEPT, and HETCOR technique. The structure of samples in solution, the influence of R-substitution on conformation, and the rule of R-substituted chemical shifts were discussed. It was found that the ¹H NMR peak of site D was split.

Using a TM₁₁₀ cavity resonator and a 2mm sample tube,ESR spectra of PMMA propagating radical in bulk polymerization process were successfully recorded at room temperature (17℃). As soon as dimethyl aniline was mixed with MMA monomer and benzoyl peroxide, 0.17 ml of the mixture was quickly transferred into the 2mm sample tube with a syringe and the spectra were recorded every 2 minutes. The 13(8 + 5) line spectrum exhibited at the beginning stage gradually changed to 9 (4 + 5) line spectrum as the polymerization proceeded. These spectra are explained by hindered oscillation model, and/or overlapping conformation model. The former seems to be more reasonable.
Our ESR data show that the concentration of the propagating radical keeps almost constant at the beginning stage and increases abruptly at a certain time in the middle stage. This characteristic time exactly corresponds to the onset of the autoacceleration process and th variation of the radical concentration is synchronous with the variation of the monomer conversion. Finally, the weak satellite lines due to concurrent flips of an electron and a nearby nucleus were observed by differential saturation technique. It is verified that the dominant electron spin-lattice relaxation mechanism arises from the angular modulation of the dipolar coupling to lattice protons via torsional motion of the free radical around its equilibrium position.

Ages of some carbonate deposites sampled in South China were determined by ESR dating.The results show a good consistence with the Carbon-14 method. Some of the factors are discussed in detail to improve the accuracy of ESR dating,suvch as sample treatment, ESR measurement, determination of the annual dose and total dose, and data proccess.

In simulating the chemical shift-concentration curves of organic solvents in the binary mixtures of water with tetrahydrofuran, dioxane, acetonitrile and triethyl phosphate, the formation constants of 1:1 and 1:2 complexes were evaluated. With the constants thus obtained, the ¹H chemical shifts of water were calculated which fit well to those observed, when the ¹H chemical shift of un-combined water is expressed by:^H₂Oδ₀=1.07+3.71e^{k(0.018-1/[H₂O])},where k is a constant characterizing the basicity and molecular weight of the solvent. The degree of structural break of water by organic solvents depends on their basicities.

In this paper the utilization of ¹H NMR including both peak height and integration determination methods is reported in the estimation of the relative contents of ethyl 7-chloro-l-ethyl-6-fluoro-1.4-dihydro-4-oxoquinoline-3-carboxyla-te and its 5-chloro isomer which were produced in the cyclization reaction of di-ethyl 3-chloro-4-fluoroanilinemethylene-malonate in the presence of different Lewis acids.

In this paper, the identification of twenty new synthesized title compounds (Monolactam derivatives) by 80 MHz ¹H-NMR spectra is reported. The stereo-configuration of monolactam ring was proved with coupling constant.All synthesized compounds were concluded to be cis-monolactam derivatives through the resolution of the spectral data in detail. The effect of solvent and substituted group on chemical shift are discussed.

The ¹H-NMR and ¹³C APT pulse sequence was used to determine the structure HC≡C-CH₂-O-C^CH₃-_O-CH₂,which has never been published in the litera-tures. In this paper, the relations between the peak intensity and the pulse interval time were calculated; the phases of the spectral lines were discussed and the groups of CH₃, CH₂, CH and the quaternary carbons were distinguished.

The ¹H and ¹³C NMR signals of anisodamine and anisodine were assigned by two dimensional NMR and double resonance technique.The results are discussed. It was deduced that the NCH₃ configuration of anisodine is axial and that of ani-sodamine is equatorial mainly from the ¹³C NMR chemical shifts.

In this paper a short cavity resonator which reduces the resonance linewidth of Rb maser is proposed.By using a H₀₃₁ mode cavity and a discal quartz bulb coated with paraffin, the geometric dimension of the cavity was designed, the filling factor of the cavity and the maser oscillating condition were evaluated, and its linewidth is given as compared with H₀₂₁ mode cavity.

The experimental results show that flat sample cell not only can be used to measure ESR spectrum of aqueous sample in a TE₀₁₁ mode cylindrical cavity,but also gives a good cavity quality factor Q and high quality ESR signals. The observed signal height was 3.2 times as large as the maximum signal height that can be obtained when a capillary tube with optimum size was used in the same cavity, and 3 times as large as the signal height when a flat cell was used in a TE₁₀₂ mode rectangular cavity with waveguide size. In this paper,a theoretical analysis is given.

The development,the recent situation and the principles of ESR dating are introduced in this paper. The total doses of the natural radiation (i.e.the Archaeological Dose-AD) in the samples, such as the spring travertine from an active fault zone at the Xianchui River, the stalagmite from the fouth place cave of Choukoutien, the Lamprotula fossils from Nihewan, were determined by ESR method. The ESR age of the stalagmite is 6×10⁴ years.Finally, ESR dating with relation to the other factors is also discussed.

The least square algorithm using forward and backward linear prediction (LS algorithm)for the autoregressive spectral estimates of the SMMW Fourier transform spectroscopy data is presented. The improvements obtained from the LS algorithm over the maximum entropy algorithm (Burg algorithm) include higher resolution in the spectrum, less bias in the frequency estimate of spectral components, and absence of observed spectral line splitting. The effects of the width of spectral window and the noise on the resolution are discussed.