一维P S D激光定位反馈指示电路设计

针对某新型激光定位微角位移测试系统, 应用一维P S D接收激光并定位反馈指示, 设计了一维P S D对 中处理电路. 实验证明, 激光光斑小于1 0mm时, 对中精度达1mm     

计算激光腔靶流场的EL—1D2D方法

针对激光腔靶内流场的复杂性给出了一种欧氏与拉氏格式相结合、一维与二维计算相结合的方法，我们把它称为ＥＬ－１Ｄ２Ｄ方法。这种方法在跟踪界面活动网格方法的基础上，建立了设置欧拉线以及在欧拉线的一侧进行网格自动合并的计算技术，从而适应了腔体内比较复杂的流动。数值试验的结果表明，用这种方法计算腔靶流场的运动可以得到合理的物理图象。     

MOCVD激光诱导选择原子层外延(LALE)生长室的研究

本文对MOCVD激光诱导选择原子层外延进行了研究,设计并制作了一种激光诱导原子层外延生长室结构,该系统能实现低温MOCVD生产,可形成稳定的层流,易于生长均匀的外延层,通过激光诱导可实现选择性的原子层外延.     

温度对Ar^＋诱导Au—Si界面原子混合的影响

本文在77至573K温区研究了Ar~ 诱导的Au-Si<111>界面的原子混合现象。温度对混合结果有强烈的影响。Q_((S)_i)—T曲线的特征与Cr-Si等体系是不同的;得到了具有确定组份比的Au_(48)Si_(51)(≈AuSi)均匀混合层;T>32℃时,深入到Si中的Au原子呈指数衰减的尾巴,为解释此指数尾巴,提出了填隙原子增强扩散机制及方程。     

@—激光冷却与囚禁的原子喷泉

本文介绍了激光冷却与囚禁的原子喷泉的主要环节，首先介绍了与原子喷泉有密切关系的光学粘团和原子的原理和结构，然后介绍了原子喷泉的实验装置、实验步骤和实验结果。     

镁原子MgI3snd^1,3D2序列能谱及寿命的研究

本文用多通道量子数亏损理论（ＭＱＤＴ）对镁原子ＭｇＩ单激发Ｒｙｄｂｅｒｇ序列３Ｓｎｄ＾１，３Ｄ２激发态能级结构和能态寿命进行了理论分析和详细的计算，预言了３ｓｎｄ＾１，３Ｄ２序列ｎ≤３０的未知能级及其寿命值，此外，我们还首次预言了实激发态３Ｐ＾２＾１Ｄ２能级位于５４３３０．２６ｃｍ＾－１处。     

原子镁的电子碰撞电离

使用Ｒ－矩阵方法，在扭曲库仑－玻恩非交换近似下（ＤＣＢＮＸ）采用二态密耦图象，计算了原子镁从电离阈值附近到１００ｅＶ范围的电子碰撞电离截面。从能量微分截面可看到明显的Ｒｙｄｂｅｒｇ系列共振。     

火焰原子吸收光谱测定头发中的锌,铁,钙,镁

本文研究了头发中锌，铁，钙，镁微量金属元素的火争原子吸收分光光度法的测定，方法简便，省时，具有良好的精密度和准确度，相对标准偏差分别为锌２．９％，铁１．９％，钙１．３％，镁３．４％。     

原子吸收法测定硅藻土中的铁,钙和镁

通过Al、SiO_2、HClO_4对Fe、Ca、Mg原子吸收法测定干扰的研究,对仪器工作条件、溶样方法的研究,建立了原子吸收法测定硅藻土中Fe、Ca、Mg的分析方法。此法测定Fe、Ca、Mg的相对标准偏差分别是Fe<2.0%、Ca<9.0%、Mg<10.0%,三元素回收率均在94-106%之间。     

直流外电场诱导的MgI高里德堡态的混合

在直流外电场存在时,观察到MgI的经双光子禁戒跃迁3s~2 ~1S→3mp ~(1P)的多光子电离和倍频效应并解释为外电场引起的里德堡(Rydberg)态之间轨道角动量的混合.实验结果与理论解释一致.     

测量原子里德堡态的新方法——双光子共振非简并四波混频

本文介绍了一种测量原子里德堡态的新方法--具有中间态的双光子共振非简并四波混频,与现代实验方法不同,该方法是纯光学的方法,其光路简单,检测的是相干光,而不是电子或离子信号.当用窄带宽的激光时,该技术对里德堡能级的窄光谱结构可以获得消多普勒的分辨率.     

腔衰荡光谱技术测量O2禁戒跃迁绝对吸收截面

腔衰荡光谱技术(CRDS)不仅具有较高的测量灵敏度,还可对样品的绝对吸收进行测量。采用连续激光腔衰荡光谱技术,通过测量O2分子三重禁戒跃迁b1∑g X3∑g-(3,0)带RQ(5)谱线(波数17266.090 cm-1)处,极限真空及不同气压下的衰荡时间,利用逼近法得到空腔寿命为2.9174 ms,由此拟合获得其绝对吸收截面为1.4998(±0.0967)×10-26cm2,与先前的文献估计值一致。由空腔寿命获得的谐振腔高反镜的反射比为99.989(±0.001)%,较通常的测量方法更为精确,该实验条件下的等效吸收程长比几何程长增大了约9090倍。     

Three photon resonant ionization in atomic potassium via S,P, D and F series Rydberg states

Single colour three photon resonant ionization (2 + 1) is observed in atomic potassium vapour in a heat pipe oven using an excimer laser pumped dye laser. Using wavelengths between 570 nm and 603 nm various²S and²D Rydberg states are populated by two photon excitation. Third photon of the same wavelength ionizes the atoms. Rydberg states up ton ⋍ 50 are observed. Electric field as low as 1 V/cm causes extensive Stark mixing of the states. This results in progressively higher three photon ionization signals via the perturbed²P and²F Rydberg states. The three photon ionization process is studied using both linearly and circularly polarized incident light. The experiment shows qualitatively that the²P Rydberg states are perturbed primarily by the²D states in the prescence of an external electric field and to a much smaller extent by²S states. This is also explained theoretically by calculating the Stark mixing coefficients under the Bates and Daamgard (1949) approximation. Implication for a similar effect in other alkali elements is discussed.     

Observation of 1D−1S forbidden optical emission of atomic oxygen in atmospheric-pressure N2/O2 plasma jet

We observed green optical emission from an atmospheric-pressure N₂/O₂ plasma jet. The green optical emission was composed of a line emission at λ = 557.71 ± 0.03 nm and a broadband component at 530 ≤ λ ≤ 560 nm . The line emission was assigned to the ¹D−¹S forbidden transition of atomic oxygen, whereas the broadband emission was due to the formation of O(¹S)N₂ excimer. We measured the absolute densities of O(¹S) and O(¹S)N₂ using a spectrograph with the absolute sensitivity calibration, and we discussed the kinetics in the green plasma jet on the basis of the absolute O(¹S) and O(¹S)N₂ densities. According to the rate coefficients and the transition probabilities reported in literature, the present experimental results are explained if the densities of and O(³P) are 9 × 10¹³ and 3 × 10¹³cm⁻³ , respectively.     

Laser Induced Fluorescence Spectroscopy of IrN

利用激光蒸发/反应的自由射流膨胀和激光诱导荧光光谱方法,研究了IrN在394-520nm光谱区域的高分辨率激光诱导荧光光谱. 观察并分析了7个新的振动谱带. 确定了其中有两条是Ω=1和五条是Ω=0的新谱带. 用最小二乘法拟合了转动跃迁谱线,由此确定了高能级的精确光谱常数. 同位素分子光谱为振动光谱的标识提供了进一步的验证, 比较测得的IrB、IrC和IrN的电子态光谱推进了对这一系列分子的化学成键性质的认识.     

汞原子6sns 3S1,6snd 3D1 Rydberg系列的寿命

利用多通道量子数亏损理论计算了汞原子6sns^3S1(n=11～25),6snd^3D1(n=12～24)两个Rydberg系列的能级和寿命,给出了这两个系列寿命所遵循的公式,6sns^3S。系列为r=0．814v^2.835(ns),6snd^3D1系列为r=0．302v^2.926ns),其中v为有效量子数。     

铯47D精细能级超冷里德堡原子自由演化的动力学研究

用连续窄线宽激光器将超冷铯里德堡原子分别激发到47D_3/2, 47D_5/2精细态, 观察了处于里德堡精细态的铯原子向超冷铯等离子体自由演化的过程, 详细对比了不同精细态的铯里德堡原子预电离时间、电离速率以及等离子体的转化效率. 将里德堡原子快速转化为等离子体的过程解释为局域势阱内由预电离产生的电子与里德堡原子的快速碰撞导致的雪崩电离.     

High-resolution isotope shift measurement of the MgI 1 S 0 - 3 P 1 intercombination transition

We measured the isotope shift of the MgI intercombination line 3s3p ³ P ₁-3s ^{2 1} S ₀ (=457 nm) for the three stable isotopes ²⁴Mg, ²⁵Mg and ²⁶Mg. The measurement was performed by optical Ramsey spectroscopy (respectively saturation spectroscopy for ²⁵Mg) on a magnesium atomic beam. The rf precision of the measurement was achieved by using optical sideband techniques for the stabilization and tuning of a dye laser relative to an ultrastable cavity.     

High-resolution 133Cs 6S-6D, 6S-8S two-photon spectroscopy using an intracavity scheme

This Letter presents an intracavity scheme for diode laser based two-photon spectroscopy. To demonstrate generality, three (133)Cs hyperfine transition groups of different wavelengths are shown. For the 6S-6D transitions, we achieved a 10(2) times better signal-to-noise ratio than in previous work [J. Phys. Soc. Jpn. 74, 2487 (2005)] with 10(-3) times less laser power, revealing some previously vague and unobserved spectra. Possible mutual influences between the two-photon absorber and laser cavity were investigated for the first time to our knowledge, which leads to the application of a reliable hand-sized optical frequency reference. Our approach is applicable for most of the two-photon spectroscopy of alkali atoms.