O（^1D）＋H2非绝热碰撞动力学的Ehrenfest模型研究

本采用Ｈ２Ｏ的二个＾１Ａ１态的双值多体项展式（ＤＭＢＥ）势能函数，用Ｅｈｒｅｎｆｅｓｔ模型方法研究了反应（１）Ｏ（＾１Ｄ）＋Ｈ２→ＯＨ和（２）Ｏ（＾１Ｄ）＋Ｈ２→ＯＨ（Ａ＾２∑＾＋）＋Ｈ的非绝热碰撞动力学过程。讨论了电子非绝热跃迁对反应（１）的影响及Ｈ２振动能对反应（２）的促进作用。并求得反应（１）的室温速度常数为０．９４４×１０＾－＾１＾０ｃｍ＾３．ｍｏｌｅｃｕｌｅ＾－＾１．ｓ＾－＾１。     

Dy^3＋掺杂的氟锆酸盐玻璃的光谱性质

测量了氟锆酸盐玻璃中Ｄｙ＾３＋离子的吸收光谱和荧光光谱。根据Ｄｙ＾３＋离子的吸收光谱,得到氟锆酸盐玻璃中Ｄｙ＾３＋离子的Ｊ－Ｏ参量Ω,Ω３．２９×＾２０ｃｍ＾２,Ω４＝１．５６×１０＾２０ｃｍ＾２,Ω６＝２．４８±１０＾２０ｃｍ＾２,经计算了氟锆酸盐玻璃中ｙ＾３＋离子的发射特性,计算了Ｄｙ＾３＋离子１．３μｍ发射的＾６Ｆ１１／２（６Ｈ９／２）→６Ｈ１５／２跃迁的发射截面σ＝０．６２×１０＾－２０ｃ     

铁酸盐的水热氧化晶化法制备及其生成条件研究

研究了空气氧化Ｍ＾２＋（Ｍ＝Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ）和Ｆｅ＾２＋的碱性悬浮液制备铁酸盐ＭＦｅ２Ｏ４的条件，考察了原料配比、ｐＨ值、氧化温度、氧化时间对生成ＭＦｅ２Ｏ４的影响。利用ＸＲＤ及ＳＥＭ检测氧化过程中沉淀物的形态和结构表明，在３４３￣３５８Ｋ和Ｒ＝２ＯＨ＾－／（Ｍ＾２＋Ｆｅ＾２＋）＝１．０、Ｍ＾２／Ｆｅ＾２＋＝０．５（摩尔比）下用３００ｍＬ／ｈ的空气氧化Ｍｘ／３Ｆｅ１－ｘ／３（ＯＨ）２悬浮液     

类Be离子电子碰撞电离的速率系数计算

本文用Ｓａｍｐｓｏｍ等的“Ｚ－标度类氢模型和库仑玻恩交换近似”方法，修改了Ｓａｍｐｓｏｎ理论中关于屏蔽常数的定义，选用电子机轨道平均半径标准，使用多组态Ｈａｒｔｒｅｅ－Ｆｏｃｋ（ＭＣＨＦ）及多组态Ｄｉｒａｃ－Ｋｏｃｋ（ＭＣＤＦ）方法计算屏蔽常数，并给出了类Ｂｅ离子Ｃ＾２＾＋，Ｎ＾３＾＋，Ｏ＾４＾＋，Ｎｅ＾６＾＋及Ｆｅ＾２＾２＾＋的电离速率系统。从计算结果，可以看到高荷电靶离子的相对论效应。     

直接激光气化产生水溶剂化的氧化镁团簇

用飞行时间质谱仪探测了直接激光气化碱式碳酸镁样品产生的质谱，结果表明：氧化镁团簇与同时产生的水分子发生了原位溶剂化反应并产生了各种尺寸的溶剂化氧化团簇离子，这些团簇离子包括：（Ｍｇ（Ｈ２Ｏ）ｍ）＾＋（ｍ＝０，１，２，３），（Ｍｇ（ＭｇＯ）Ｈ２Ｏ）ｍ（ｍ＝１，２，３，４）（Ｈ（ＭｇＯ）（Ｈ２Ｏ）ｍ）＾＋（ｍ＝０，１，２，３，４，５，６），（Ｈ（ＭｇＯ）２（Ｈ２Ｏ）ｍ）＾＋（ｍ＝０，１，２，３，４，５     

乙胺分子的多光子电离过程质谱研究

报道了乙胺分子在４４０～４７５ｎｍ波长范围内多光子电离（ＭＰＩ）质谱（ＭＳ）研究结果。碎片离子主要由母体离子碎裂模式产生。母体离子ＣＨ３ＣＨ２Ｎ＋·Ｈ２由经３ｓ里德堡态的（２＋２）共振多光子电离产生后，大部分发生β键断裂，形成ＣＨ２＝Ｎ＋Ｈ２离子，还有一部分再吸收一个光子，通过Ｃ－Ｈ（ＣＨ２）键的断裂产生了ＣＨ３ＣＨ＝Ｎ＋Ｈ２离子。ＣＨ３ＣＨ＝Ｎ＋Ｈ２和ＣＨ２＝Ｎ＋Ｈ２离子最容易发生的碎裂过程是脱去氢分子，分别产生Ｃ２Ｈ４Ｎ＋（分子式）离子和ＣＨ≡Ｎ＋Ｈ离子。     

HD^＋核间距及基态势能曲线的排列通道量子力学计算

依据排列通道量子力学（ＡＣＱＭ）的基本原理，对分子离子ＨＤ＾＋的核间距和基态势能曲线以及离解能Ｄｅ做了量论计算，得到了ＨＤ＾＋的核间距为２．０７２５ａｏ，并求得ＨＤ＾＋按两种方式离解时的势能曲线，认为多数ＨＤ＾＋应按Ｈ＾＋＋Ｄ的方式离解。通过比较计算，文章认为ＨＤ＾＋比Ｈ２＾＋更容易激发和离解，也更不稳定。同时文章对用ＡＣＱＭ解决非对称的同位素微团簇的一般方法做了简明阐述。     

含ZnS：Mn^2＋纳米晶玻璃中Mn^2＋三种格位态的EPR研究

通过对ＺｎＳ：Ｍｎ＾２＋不同含量的钠硼硅玻璃发光和激发光谱测量,发现Ｍｎ离子可能占扭替位（Ｍｎ＾２＋）ｓｕｂ和间隙（Ｍｎ＾２＋）ｉｎｔ两种格位。进一步的电子 磁共振（Ｅｌｅｃｔｒｏｎ Ｐａｒａｍａｇｎｅｔｉｃ Ｒｅｓｏｎａｎｃｅ,ＥＰＲ）实验证实了这一判断,并从ＥＰＲ谱人（Ｍｎ＾２＋）Ｓｕｂ,（Ｍｎ＾２＋）ｉｎｔ和Ｍｎ团三种格位态的存在。观测到ｇ因子和超精细结构（ＨＦＳ）常数随纳米晶粒径的减小而增     

乙胺分子的多光子电主过程质谱研究

报道了乙胺分子在４４０－４７５ｎｍ波长范围内多光子电离（ＭＰＩ）质谱（ＭＳ）研究结果。碎片离子主要由母体离子碎裂模式产生。母体离子ＣＨ３ＣＨ２ＮＨ２由经３ｓ里德堡态的（２＋２）共振多光子电离产生后，大部分发生β键断裂，形成ＣＨ２＝Ｎ＋Ｈ２离离子，还有一部分再吸收一个光子，通过Ｃ－Ｈ（ＣＨ２）键的断裂产生了ＣＨ３ＣＨ－ＮＨ２离子。ＣＨ３ＣＨ＝ＮＨ２和ＣＨ２＝ＮＨ２离子最容易发生的碎裂过程是脱去氢分子     

NeH2^＋体系的势能函数与动力学研究（二）Ne＋H2^＋（v）与NeH^…

基于多体项展式方法所导出的ＮｅＨ２＾＋（＾２Σ＾＋）的分析势能函数，用准经典的Ｍｏｎｔｅ－Ｃａｒｌｏ轨迹法研究了Ｎｅ＋Ｈ２＾＋（ｖ）→ＮｅＨ＾＋＋Ｈ、Ｎｅ＋Ｈ２＾＋（ｖ）→Ｎｅ＋Ｈ＋Ｈ＾＋和ＮｅＨ＾＋＋Ｈ→Ｈ２＾＋＋Ｎｅ的反应动力学。研究表明，前两个反应在Ｈ２＾＋的初始振动基态时的反应阈能分别为１６ｋｃａｌ·ｍｏｌ＾－１和６２ｋｃａｌ·ｍｏｌ＾－１，反应阈能随振动量子数增大而减小。最后一个反应是无     

The characteristics of O＋HD （v = 0, j = 0） reaction dynamics

The analytical potential energy function of HDO is constructed at first using the many-body expansion method.The reaction dynamics of O+HD(v = 0,j = 0) in five product channels are all studied by quasi-classical trajectory(QCT) method.The results show that the long-lived complex compound HDO is the dominant product at low collision energy.With increasing collision energy,O+HD → OH+D and O+HD → OD+H exchange reactions will occur with remarkable characteristics,such as near threshold energies,different reaction probabilities,and different reaction cross sections,implying the isotopic effect between H and D.With further increasing collision energy(e.g.,up to 502.08 kJ/mol),O+HD → O+H+D will occur and induce the complete dissociation into single O,H,and D atoms.     

State-to-state dynamics for O(1D)+D2-->OD+D: evidence for a collinear abstraction mechanism

The O(1D)+D2-->OD+D reaction at two different collisional energies, 2.0 and 3.2 kcal/mol, is investigated by using the H(D) Rydberg "tagging" time-of-flight technique. Experimental results in this study indicate that the OD product is clearly more backward scattered relative to the O(1D) beam direction at the collisional energy of 3.2 kcal/mol. The extra backward scattered OD products are mostly in the highly vibrationally excited states (upsilon = 4,5,6), which is typical of a collinear abstraction mechanism. The experimental results in this work also provide a good testing bed for quantitative theoretical investigations of this benchmark system.     

Hydrogen–Deuterium Exchange Reaction of 2-Benzylthio-5-Methyl-1,2,4-Triazolo[1,5-a]Pyrimidine Under Basic Conditions

Hydrogen–deuterium (H–D) exchange usually happens between D₂O/CD₃OD solvent and N-heterocyclic compounds in the presence of a base. 2-Benzylthio-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine (BMTP) is an important intermediate for the synthesis of triazolopyrimidines with bioactivities. No exchange was observed when BMTP was dissolved in a CD₃OD solvent. However, a significant H–D exchange was observed after a small amount of NaOD had been added to the solution. According to the time-varying proton intensity, the rates (k _ex) of H–D exchange were achieved under various temperatures and different amounts of NaOD. The results showed that the H–D exchange rates of H3, H4, and H5 were different under identical conditions, but were enhanced with increasing temperature and concentration of NaOD. A mechanism of H–D exchange that might be instructive in the ring-open reaction of 1,2,4-triazolo[1,5-a]pyrimidine derivatives was proposed.     

应用SVRT模型对氢与氘代甲烷反应的四维量子散射计算

应用SVRT(Semirigid Vibrating Rotor Target)模型和含时波包法对H CD4→HD CD3反应体系进行了量子散射计算,得出了该体系基态的反应几率,散射截面和热速率常数等量子结果,并比较了靶分子氘代甲烷中氘对氢的替代效应。     

Dynamics of the reaction of O with H2 and its isotopic variants in different rotational excited states

Scalar properties and vector correlations of the reactions of O+H 2 →OH+H, O+HD→OH+D, O+DH→OD+H, and O+D 2 →OD+D at collision energies of 25 and 34.6 kcal/mole have been studied via the quasi-classical-trajectory (QCT) method based on a BMS1 potential energy surface (PES). The generalized polarization-dependent differential cross section and the distributions of the dihedral angle at the collision energy of 34.6 kacl/mole are presented. The calculated results indicate that both the reagent rotational angular momentum and the mass factor have a significant influence on the scalar properties and vector correlations of the title reactions.     

D+CD4→CD3+D2反应的量子含时动力学研究

运用半刚体振动转子靶(semirigid vibrating rotor target)模型,利用含时波包法(TDWP method),对反应D+CD4→CD3+D2进行了量子含时动力学研究与计算.反应几率随平动能的变化图象,呈现出显著的量子共振特性.并通过对v=0时,j=0,1,2的反应几率以及j=0时,v=0,1的反应几率的计算,对该反应的空间效应进行了研究与分析.     

Analysis of cyclic boronated and trimethylsilylated phenolalkylamines by gas chromatography and electron impact mass spectrometry

The side chain of phenolalkylamines containing a bifunctional group was derivatized as the cyclic boronate, and then the residual phenolic group was trimethylsilylated. The resulting derivatives were single reaction products in each case, with good gas chromatographic properties and informative mass spectra to afford prominent molecular ions by gas chromatography with electron impact mass spectrometry (GC/EI-MS). The cyclic boronated-trimethylsilylated derivatives yielded the isotope pattern for boron ((10)B:(11)B =-1:4.2) and characteristic ions [M](+), [M - H](+), [M - CH(3)](+), [M - RBO](+), [M - TMSO](+), and [M - TMSO - C(6)H(5)](+) ions in the mass spectra. In order to distinguish between m- and p-phenolalkylamines, the mass spectra of the cyclic phenylboronated-trimethylsilylated (PBA-TMS) derivatives were compared with those of the trimethylsilylated (TMS) derivatives. The TMS derivatives of octopamine (p-) and norfenefrine (m-) showed identical mass spectra, while the PBA-TMS derivatives had mass spectra sufficiently different from one other to distinguish between the isomers. The most prominent ion of the PBA-TMS derivative is the [M - H](+) ion (m/z 310) for octopamine and the [M](+) ion (m/z 311) for norfenefrine. Copyright 1999 John Wiley & Sons, Ltd.     

Dynamics of reaction of O with H2 and its isotopic variants in different rotational excited states

Scalar properties and vector correlations of the reactions O+H₂ →OH+H, O+HD→OH+D, O+DH→OD+H, and O+D₂ →OD+D at collision energies of 25 and 34.6 kcal/mole have been studied via quasi-classical-trajectory (QCT) method based on a BMS1 potential energy surface (PES). Generalized polarization-dependent differential cross section and the distributions of the dihedral angle at the collision energy of 34.6 kacl/mole are presented. The calculated results indicate that both reagent rotational angular momentum and the mass factor have a significant influence on the scalar properties and vector correlations of the title reactions.     

Surface aligned ion-molecule reaction: direct observation of initial and final ion momenta

An ion-molecule reaction has been studied by measuring the momentum of both the reactant and the product ions. This is carried out in an ordered molecular film of CD3I where electron stimulated desorption causes the reaction CD+3+ CD3I--> C2D+5+DI. The close similarity of the normal momentum of CD+3 and C2D+5 indicates that a sticky collision occurs in which, to within 10%, the momentum of the reactant ion is transferred to the momentum of the product ion. The measurement represents the first use of molecularly aligned species to study momentum effects in an ion-molecule reaction.     

H3O+, NO+和O+·2离子同九种烷氧基醇化合物反应的研究

在用选择离子流动管质谱(SIFT-MS)分析常用指甲油清洗垫发现大量4-丁酸内脂(γ-butyrolactone, GBL)和2-丁氧基乙醇(2-butoxy-1-ethanol)等挥发性气体后, 运用选择离子流动管(SIFT)对H3O , NO 和O ·2离子同九种烷氧基醇化合物(R1-O-R2OH)之间的反应进行了研究. 获得了这些反应在潮湿空气条件下进行的情况, 并运用产物离子水合物的种类和分布来确认产物离子的结构和反应机理. 还研究了在不同载气压力下进行的反应. 结果表明, 这些化合物同H3O 和NO 的反应都是先生成初生态离子-分子络合物, (H3O .M)*和(NO .M)*, 然后经不同反应渠道生成各种离子产物. 这些初生态络合物同反应体系中存在的气体分子(如氦气, 氮气和氧气分子)的碰撞对最终离子产物的形成和分布也有影响. 这些化合物同O2 ·反应会生成各种离解碎片离子, 但不能确定这些离子是否经由初生态络合物(O2 ·.M)*生成. 该项研究提供了用SIFT-MS在空气和潮湿气体中分析这些化合物所需的反应速率常数和离子产物等动力学数据, 并将进一步应用到药物成瘾及滥用和呼吸道疾病的诊断和分析等领域.