O2分子吸附的金属表面的O2(1Δg)猝灭

建立了一套流动装置测量单重态氧O₂(¹Δ_g)在O₂分子吸附的金属Cu、Cr、Ni和Ag表面的猝灭几率. 随实验时间和O₂(¹Δ_g)浓度增加,猝灭几率增加. 当上述金属样品在几帕斯卡的真空度下暴露数小时后猝灭几率会回到原先水平. 提出了一种基于表面吸附位上弱化学吸附的表面吸附氧分子O₂(¹∑_{g相似文献}   

O2(1Δg)二聚物激光振荡研究

从理论上估算了O2(1Δg)二聚物激光输出功率,在实验中以微波(2.450 GHz)激励高纯氧产生02(1Δg)二聚物,采用平凹稳定谐振腔,首次在波长6561 nm处实现了O2(1Δg)二聚物的激光振荡,当充入氧气压强为133.3 Pa,微波激励功率为600 W时,激光输出功率可达100 μW,此结果在数量级上与理论估算相同.另外还测得激光束散角约37.3 mrad.     

O2(1△)发生器溶液预混及反应换热系统设计

通过采用离心泵与换热器进行的换热系统设计,缩短了溶液预混时间,增强了O2(1△)发生器的反应换热效率,同时使发生器在反应中具备了动态传质性能,改善了氧碘化学激光器的输出功率.     

O2(1Δ)发生器溶液预混及反应换热系统设计

 通过采用离心泵与换热器进行的换热系统设计,缩短了溶液预混时间,增强了O₂(¹Δ)发生器的反应换热效率,同时使发生器在反应中具备了动态传质性能,改善了氧碘化学激光器的输出功率。     

体光源模拟标定法测O2(1Δ)绝对浓度

 O₂(¹Δ)绝对浓度的测量,一直是SOG和COIL研究中的重要参数之一。体光源模拟标定法测O₂(¹Δ)绝对浓度,是把发光气体以某一流速引入一已知体积的流动光池中,再通过具有低象差失真的光学系统,把该体光源成象在探测器的有效表面上。探测器和测量仪器组成的测量系统,要经过标准光源和电学标定。本方法可测出O₂(¹Δ绝对浓度和其分压,O₂(¹Δ)产率等参数。其中O₂(¹Δ)浓度测量结果的相对误差为20%。     

射流式O2(1Δ)发生器射流破断长度测量

 实验研究了甘油－水溶液通过用不同加工方法和不同喷管长度/直径比的喷管形成射流的破断长度。射流的行为与喷管内是层流还是湍流的流动状态关系极大。当射流速度比较大时,喷管的缺陷如进口出口的毛刺和流道壁的粗糙度是诱发湍流使射流破断的主要原因。这些结果对化学氧碘激光的射流式O₂(¹Δ)发生器的喷管设计和制造提供了有价值的参考。     

20 Ne(34 Ne)原子与18 Na2(23 Na2,37 Na2)分子低温下冷碰撞的同位素效应研究

本文用多体刚性椭球模型计算了相对入射能量为190 meV时,氖的同位素原子²⁰Ne,³⁴Ne与钠的同位素分子¹⁸Na₂,²³Na₂,³⁷Na₂ 替代碰撞体系的态态转动激发积分散射截面和总转动激发积分散射截面,在此基础上计算并分析了相互作用势的不同区域对²⁰Ne-¹⁸Na_{2关键词： 多体刚性椭球模型 转动激发积分散射截面 钠同位素分子 椭球等势面}     

新型准分子——O2(1Δg)二聚物增益特性的研究

本文从理论上估算了O2(1Δg)二聚物的增益系数,在实验中以微波(2450 MHz)激励产生激发态(1Δg)的氧分子,利用放大的自发辐射法,首次获得了波长为6561nm处介质的增益特性曲线。当气压为0.3 torr,激发功率为300W时,净增益为0.0183cm-1可望实现激光振荡。     

列管型射流式O2(1△)发生器的COIL出光研究

采用列管型射流式O     

列管型射流式O2(1Δ)发生器的COIL出光研究

 采用列管型射流式O₂(¹Δ)发生器在COIL装置上做了一系列出光实验,对该发生器的性能、参数及相关技术等做了实验研究。实验获得化学效率最高达22.2% 。     

基于从头算势能面对S-(2P)+H2(1Σ+g)→SH-(1Σ)+H(2S)反应的量子含时波包计算

本文基于离子分子SH₂^-基态势能面,应用含时波包方法研究了反应S^-(²P)+H₂(¹Σ⁺_g)→SH^-(¹Σ)+H(²S)的动力学行为. 给出了反应几率和积分截面随碰撞能的变化关系,结果表明,在讨论的所有碰撞能量范围内二者均存在显著的振荡结构. 当初始转动量子数j=0,2,4,6,8,10和振动量子数v=0,1,2,3,4时,从总反应几率数值计算中可以看出,双原子H₂的振动激发和转动激发显著提高了反应活性. 同时积分散射截面的理论值与前人的实验值相符合.     

F2 Σ+ -X 2Σ +Band System of Cobalt Carbide

用脉冲直流放电产生Xe原子亚稳态5p56s[3/2]2和5p56s′[1/2]0.在单光子28000－42000cm-1能量范围内,结合飞行时间质谱技术获得Xe原子共振增强激发光谱.光谱分析表明,所有谱线来源于Xe原子5p56s[3/2]2和5p56s′[1/2]0两个亚稳态吸收单个光子向偶宇称np′、nf′自电离Rydberg态序列的跃迁.实验观测到许多新的自电离能级,并获得更精确和系统的能级位置和量子亏损值数据.     

Effects of O2–CO2 polarization beating on femtosecond coherent anti-Stokes Raman scattering (fs-CARS) spectroscopy of O2

Femtosecond coherent anti-Stokes Raman scattering (fs-CARS) spectroscopy has recently emerged as a promising laser-based temperature-measurement technique in flames. In fs-CARS, the broad spectral bandwidths of the pump and Stokes lasers permit the coupling of each ro-vibrational Raman transition via a large number of pump-Stokes photon pairs, creating a strong Raman coherence. However, the broad-bandwidth fs pulses also excite other molecular transitions that are in resonance. The polarization beating between these closely spaced Raman transitions can affect the coherence dephasing rate of the target molecule, making it difficult to extract accurate medium temperature. In a previous study our group investigated N₂/CO polarization beating in N₂ fs-CARS; in the present work we study O₂/CO₂ polarization beating in O₂ fs-CARS. O₂ fs-CARS can be particularly important for thermometry in non-air-breathing combustion in the absence of N₂. The effects of O₂/CO₂ polarization beating are investigated in the temperature range 300–900 K at atmospheric pressure and also at 300 K for pressures up to 10 bar. Unlike in the N₂/CO system, it was observed in the O₂/CO₂ system that the presence of CO₂ can significantly alter the time evolution of the Raman coherence and, hence, affect the measured temperature.     

Isospin-conserving hadronic decay of the Ds1(2460) into Dsπ+π-

The internal structure of the charm-strange mesons D_s0^*(2317) and D_s1(2460) are the subject of intensive studies.Their widths are small because they decay dominantly through isospinbreaking hadronic channels D_s0^*(2317)⁺→D_s⁺π⁰ and D_s1(2460)⁺→D_s^*+π⁰.The D_s1(2460) can also decay into the hadronic final states D_s⁺ππ...     

OPTICAL-OPTICAL DOUBLE-RESONANCE EXCITATION SPECTRA OF THE (6d)1Πg, (7d)1Πg HIGH-LYING RYDBERG STATES IN Na2

Two ¹Π_g states of Na₂ for v≤13 have been observed by using optical-optical double resonance (OODR) fluorescence excitation spectroscopy. The intermediate levels in B¹Π_u state are identified by the numerical calculations with the molec-ular constants for B¹Π_u←X¹Σ_g⁺ transitions and confirmed by the complemen-tary A¹Σ_g⁺←X¹Σ_g⁺ polarization spectra. Absolute vibrational numberings of the (6d)¹Π_g and (7d)¹Π_g states are determined by comparing the experimental OODR excitation intensities with the simulated Franck-Condon factors. The Dnnham coef-ficients and the Rydberg-Klein-Rees (RKR) potential energy curves of the (6d)¹Π_g, (7d)¹Π_g states are reported.     

铁电磁体Pb(Fe1/2Nb1/2)O3相变特征

借助与示差扫描量热法、磁化率测量、电子自旋共振、铁电与介电性质测量及电子衍射系统地研究了Pb(Fe_1/2Nb_1/2)O₃(PFN)的电、磁性质和相变特征．结果表明发生在380K附近的顺电－铁电转变和发生在145K附近的顺磁 反铁磁转变分别为一级相变和二级相变或弱一级相变．在室温下,PFN的剩余极化与矫顽场分别为11.5μC/cm²和3.04kV/cm.介电测量表明PFN的顺电-铁电相变为弥散型相变．其弥散指数为1.62.电子衍射表明Fe³⁺与Nb⁵⁺离子在B位置上是无序分布的,正是这种与无序分布相关联的成分涨落导致铁电相变的弥散性. 关键词：     

Zcs(4000)+ and Zcs(4220)+ in a Multiquark Color Flux-Tube Model

We systematically investigate the mass spectrum, spatial configuration and magnetic moment of the ground and p-wave states ■ with various color-spin configurations in a multiquark color flux-tube model. Numerical results indicate that the state Z_cs(4000)⁺ can be described as the compact state ■ with 1³S₁. Its main colorspin configuration is ■ and its magnetic moment is 0.73μN. The state Z_cs(4220)⁺can be depicted as the compact sta...     

钾双原子分子21∑+u─x1∑+sub>g跃迁连续谱带研究

理论计算了钾双原子分子21∑+ｕ─ｘ1∑+ｇ跃迁所得到的扩散带荧光谱，并与Gondal等[4]和Luh等[5]以及Milosevic等[6]的实验结果进行了比较。计算结果与Luh等和Milosevic等的实验结果符合很好，排除了600 nm附近扩散带来自Ｋ221∑+ｕ─ｘ1∑+ｇ跃迁的可能性。     

H2(X1∑g+)—H2(E1∑g+)系统的相互作用

采用显含电子对相关坐标的波函数,在微扰论的框架下计算了E^l∑_g⁺态氢分子与基态氢分子取cross构型时的中长程相互作用。结果表明,该相互作用在分子间距6.5α₀附近存在着一个活化能势垒,在4.5α₀附近显示出较强的化学键行为。 关键词：     

Ar+ laser-induced fluorescence spectra of Cs2: The E1Σu+ and (1) 1Πg electronic states

Laser-induced fluorescence of Cs₂ molecules in the infrared (1.15–2.5 μm) and the visible (505–545 nm) regions has been observed using several excitation wavelengths from an argonion laser. Accurate molecular constants and potential energy curves for the pumped E¹Σ_u⁺ state and the first excited gerade ¹Π state are derived from more than 1300 fluorescence lines precisely measured with a high-resolution Fourier transform interferometer. The main molecular constants for the states are

     

	$\text{T}{}_{\mathrm{e}}\text{(}\text{cm}{}^{\mathrm{?1}}\text{)}$	$\text{ω}{}_{\mathrm{e}}\text{(}\text{cm}{}^{\mathrm{?1}}\text{)}$	$\text{B}{}_{\mathrm{e}}\text{(}\text{cm}{}^{\mathrm{?1}}\text{)}$	$\text{R}{}_{\mathrm{e}}\text{(}\text{A}\text{?}\text{)}$
$\text{E}{}^1\text{Σ}{}_{\mathrm{u}}{}^{\mathrm{+}}$	20195.23	29.10	0.00891	5.340733
(1) ${}^1\text{Π}{}_{\mathrm{g}}$	13913.42	18.44	0.00781	5.697722