荧光猝灭方法研究腺苷酸衍生物与嘧啶碱的弱相互作用──Stern-Volmer方程在竞争吸收体系中的修正式

已知在液氮温度下(77 K)核酸碱基之间能生成基态复合物^[1],这些复合物的荧光发射有比较大的红移.在室温条件下,核酸碱基的荧光发射量子产率很低,以至几乎无法检测.     

The Unitarity of the W(3) Algebra from SU(3) Parafermion

We express the vacuum expectation value of the SU(3)k parafermion fields by that of two bosons and SU(3)_k current algebra. When k = 1,2,3, the SU(3)_k current algebra becomes an inner product of a unitary representation, and T(z), W⁽³⁾(z) are equivalent to "quasiself-adjoint" operators in this represen tation.     

Supersymmetric Pair Coherent States

Based on the permu table property between the two-mode boson-fermion annihilator for a supersymmetric harmonic oscillator, which is described by H = b^↑b + f^↑f, and the "charge" operators b^↑b - f^↑f we construct the supersymmetric pair coherent state. The super-lie algebra associated with the supersymmetric pair coherent state is analyzed.     

Supersymmetric Unitary Operator for Some Generalized Jaynes-Cummings Models

We introduce supersymmetric unitary operators to directly diagonalize some generalized Jaynes-Cummings (J-C) Hamiltonians; which more deeply shows that supersymmetry is a natural language to depict the J-C model.     

SYNTHESES OF AZETIDINES VIA PHOTOCYCLOADDITION OF C=C TO C=N DOUBLE BONDS

The photocycloaddition of 6-azauracil (AU) with olefins have been carried out. Four new compounds,1,2,4-triazabicyclo [4,2,0] octane and 1,2,4-triazatricyclo [4,2,0^1.6,0^7.12]dodecane derivatives,were obtained. Based on structure identificationof productsand photosensitization behavior of this syste,the regioselection and the multiplicity of thisreaction were discussed.     

Inverse of Radiation Field Operators and the Generalized Jaynes-Cummings Model

We generalize the standard Jaynes-Cummings model (JCM) to a model Hamiltonian with the radiation field operators being the inverse of a harmonic oscillator's creation and annihilation operators. Some new commutative relations about the inverse operators are derived and the generalized JCM Hamiltonian's eigenstates are derived.     

3-氯-2-烃基四氢吡喃的镁开环反应

研究了用镁对3-氯-2-烃基四氢吡喃(1)的开环反应,制得一系列5-烃基-4-戊烯-1-醇(2),上述反应产率高,立体选择性强,无论顺式或反式的(1)开环时都得到反式(2).     

[Mn(H2O)4(NCS)2](18-冠-6)的分子和晶体结构

报导了[Mn(H2O)4(NCS)2](18-冠-6)单晶的X射线结构分析.它的晶体正交晶系.锰(II)与两个硫氰酸根,四个水分子配合形成顺式八面体的配位分子,并通过其中的水分子与18-冠-6以氢键结合.     

分子光化学贮存太阳能 Ⅲ.双环[2,2,1]-2,5-庚二烯的光诱导电子转移敏化异构化反应

以N,N,N′,N′-四甲基联苯二胺、2,6-二甲氧基萘和2,7-二甲氧基萘为光敏剂,在正己烷溶液中实现了双环[2,2,1]-2,5-庚二烯到四环[2,2,1,0^2,6,0^3,5]庚烷的异构化。测定了反应的量子产率。讨论了反应机理。通过激发态的光敏剂与二烯之间的电子转移反应,形成单重态和三重态处于平衡状态的离子自由基对中间体。处于溶剂笼中的三重态离子自由基对经电子反传,产生激发三重态二烯。最后该激发态二烯经分子内[2+2]环合加成反应异构化为四环烷。     

SOME REPRESENTATIONS FOR TIME-DEPENDENT HARMONIC OSCILLATOR

In terms of the IWOP (integration within ordered product) technique, we construct squeezed state formulatiion for the time-dependent harmonic oscillator.The formulation is based on the Lewis-Riesenfeld quantum theory.Some other representations are also found with the same technique.