The FIR spectrum of optically Pumped gaseous molecules was studied theoretically. The signal flow graph was used to solve the density matrix equations of the system assuming that. 1) the molecule interacting with the incident signal (including the pump and detecting signal) was considered to be a six-level quantum system; 2) the pumping power was much larger than the FIR probing signal. A set of analytical solution of the spectral characteristics of-the activated molecules has been obtained. The AC Stark effect of the FIR spectrum of vibrational ground state of activated molecules was demonstrated.The theoretical AC Stark splittings of both the laser lines and absorption spectral lines were in good agreement with the result obtained by C.H.Townes in 1955. A special transition between absorption and emission parts of the characteristic curve was found. The value of AC Stark splitting equals 2Bp/n,where n is the number of FIR photon in the multiphoton process.

The theory and experimental methods and succesful applications of multiple quantum NMR techniques are introduced and reviewed.The techniques have advantages over conventional single quantum NMR method in obtaining simple analyzable spectra which make study of molecular structure and conformation possible.In addition,the techniques are useful in studying relaxation dynamics.

A Pulsed NMR Spectrometer for analysis of ferromagnetic materials has been developed.It is based on Spinecho theory and coherent receive principle.It can operate in the frequency range 25-80MHz with the output power 10w. With using the spectrometer,the FNR line, enhancement factor and spin-spin relaxation T₂ of ferromagnetic materials may be obtained at any temperature from 77°K to 300°K.It can also be used to measure the broad NMR line of non magnetic materials.

In this paper a cesium beam maser is proposed in which the optically pumping state selection technique by two laser beams is used together with the atom storage bulb technique.The density matrix theory is used to analyse the maser oscillation conditions.The relation between the maser oscillation power and the flux of the atoms entering the bulb is derived.Assuming the use of a TE₀₂₁ mode cavity and a annular quartz bulb coated with Paraffin, the maser oscillation power and its linewidth as well as the filling factor of the cavity are evaluated.The expected short term stability of the maser is also given.A similar maser scheme with two atom beams and two separated blubs is presented too.

The Majorana transition frequency shift in cesium beam atomic frequency standards is theoretically investigated in this paper. In terms of analyses of a multiple energy level and multiple resonance system a physical mechanism causing the frequency shift is considered that transitions between Zeeman sublcvels induced as a Cs¹³³ atom pass through spatially changing magnetic fields disturb the phases of the states corresponding to the two energy levels on which a cesium beam atomic frequency standard operates, and this process coherently inserts in that of the Ramsey microwave resonance and finally its frequency shift occurs. Based on that, some experimental phenomena related to the Majorana effect in cesium beam atomic frequency standards are explained and some of methods for judging a reduction of the Majorana transitions are proposed.

The theoritical analysis on excition, formation and reception process of NMR spin echo in ferromagnet under different conditions was operated and validity was verified with experiments.With using the obtained results in this paper, the influence of some experimenf condifions on NMR measurement can be explained and one of the way to improve the methad of receiving spin echo signal has been pointed out.

The structures and equilibria of the co and(180-C-6) coordination com poundsin the acetone solution were studied by NMR method. By the analysis of shift values, It is shown that there are two main equilibria the solution. The equilibrium constants K₁₁=2.95×10² l/mol, K₂₁=6.1 l/mol as Well as the limited Chemical Shifts D₁₁^(H)=350Hz, D₁₁^(c)=-290Hz, D₂₁^(H)=1300Hz, D₂₁^(c)=-1600Hz are determined. A set of computer Programs are established. We prove that the shift mechanism is from a throgh-space dipolar interaction between the electronic magnetic moment and the magnentic moment of the resonating nucleus.

In this paper, ¹³C NMR structral identification of natural sweetener obtained from the leaves of South American wild herb, Stevia Rebaudiana cultivated in Wuhan district is described. The result shows that the main constituent is still stevioside (13-0-[β-glucosyl (1-2)] -β-glycosyl-steviol). Solvent effect of C₅D₅N and D₂O on different parts of the molecule was observed.Methods and parameters of specific bands which can be used to identify the structures of these natural sweeteners were discussed.

In this article, We have measured the ³¹P chemical shifts of the title compounds and discussed the relationship of their chemical shift-electronic effect.
It is suggested that a correlation between ³¹P chemical shifts of various O-ethyl O-aryl N-isopropyl aminothionophosphates and their herbicidal activities can be set up as shown in the following empirical approaeh
PI₅₀=-0.9025π² +0.9017π -0.560E_s-
-0.1620ΔδP + 0.8445I+4.2514
n=28, R=0.9231, S=0.3959
Its approximation and discrepancy have been discussed.

In this treatise the relationship between the ¹³C spin-lattice relaxation time, NOE enhancement factor of single substituted benzenes such as methylbenzene, ethylbenzene, nitrobenzene, halogeno-benzene etc and substituent electronegativity energy scale has been approached.

A Series of platipum (Ⅱ) complexes of the trans[PHX (PPh₃)₂], where anionic ligand(X)=NO₃^-、NO₂^-、NCS^-、Cl^-、Br^-、and I^-, have been prepared. ¹H-NMR studies of these complexes have been made. The ¹H-NMR spectra of these platincnm complexes obtained show a very large hige-field ¹H chemical shift(δ_H) in the range of-12 to-24 ppm. The coupling constants (J_pt-H) of platinum hydrogen are also large,and range 900-1400Hz, J_P-H of phosphines are about 15Hz. The effects of Ligands (X), (L) on the chemical shift and coupling constant, as well as the effect of the length of platinum(Ⅱ) hydrogen bond on the chemical shemical shift (δ_H)were studies. A linear relationship between the electronegativity of there anionic ligane (X) and ¹H chemical shift (δ_H) has been correlated.

A few empirical rules and constants of the effect of Saccharic Configuration and linking form on chemical shift have been found Withslatistical method from chemical shift data of glucopyranose and its disaccharids. Morever, few empirical formulas have been deduced for estimating ¹³C chemical shift of saccharide in glucosides.

Garamine is an aminoglycoside with biological activity Its PK_a values where determined over the PH range 2-13 by C-13NMR method. Data obtained in the experiment were analyzed by nonlinear regression method.Three PKa values have been obtained:PK₁=5.45. PK₂=6.75, PK₃=8.70. The present information can provide a basis for further study of metabolism of aminoglyco -sides in livnig body.