InP的多声子红外吸收

利用高分辨的傅里叶光谱仪,在400—4000cm^-1和11—300K范围内,观察到一些其吸收系数为10^-1cm^-1的新弱吸收峰,频率位置为996,965,932,838,806,776,742,718,590,558,538cm^-1。从这些弱吸收峰的频率位置和温度依赖关系,可以认为它们是由于三声子的晶格吸收过程所引起的。对此,我们做了适当的指认。此外,我们首次利用红外吸收法证实,LEC(B₂O₃)-CZInP单晶存在B玷污,其玷污量大约是10¹⁶cm^-3。 关键词：     

Multiphonon absorption in InP

IR absorption measurements have been made using a high resolution Fourier-transform spectrometer on crystals of InP in the region of (400–4000)cm^-1 at temperature between 11–300k. Very weak, new absorption bands, their absorption coefficients are of ∼10^-1cm^-1, were observed at 996cm^-1, 965cm^-1, 932cm^-1, 838cm^-1, 776cm^-1, 742cm^-1, 718cm^-1, 590cm^-1, 558cm^-1 and 538cm^-1. The frequencies and temperature dependence of these weak bands indicate that they arise from three-phonon processes and appropriate assignments are given. We observed using IR absorption technique for the first time the boron contamination in LEC(B₂O₃)-CZ InP crystal. The content of boron contamination has been proved to be of ∼10¹⁶cm^-3.     

新型激光晶体Yb:KY(WO4)2的结构与光谱

采用顶部籽晶提拉法，以K₂W₂O₇为助溶剂，生长了Yb:KY(WO₄)₂新型激光晶体.经热重-差热分析，确定晶体熔点为1045℃，相变温度为1010℃.X射线粉末衍射测试，验证所生长的晶体为β-Yb:KY(WO₄)₂.晶体结构分析确定Yb:KY(WO₄)₂晶体由WO₆八面体连接而成，WO₆八面体是由双氧桥(WOOW)及单氧桥(WOW)构成.晶体粉末样品室温下的红外及拉曼光谱测试，确定WO₆原子基团、双氧桥及单氧桥的振动频率.晶体的吸收峰位于940nm，980nm，发射峰位于989nm—1030nm. 关键词： 晶体结构 光谱 晶体生长     

氮氢共掺杂金刚石中氢的典型红外特征峰的表征

所有天然Ia型金刚石红外光谱中都存在3107 cm-1特征峰,而在金属触媒直接合成的金刚石红外光谱中没有检测出3107 cm-1特征峰.本文在6.3 GPa,1500?C条件下,通过Fe70Ni30触媒中添加P3N5直接合成出具有3107 cm-1特征峰的氮氢共掺杂的金刚石.红外光谱分析表明,合成的金刚石中氢有两种存在形式:一种对应着乙烯基团C=CH2中C—H键的伸缩振动(3107 cm-1)和弯曲振动(1450 cm-1)的吸收峰,另一种对应着sp3杂化C—H键的对称伸缩振动(2850 cm-1)和反对称伸缩振动(2920 cm-1)的吸收峰.通过分析发现,3107 cm-1吸收峰与金刚石中聚集态的氮原子有关,当金刚石中没有聚集态的氮元素时,即使氮含量高也不会出现3107 cm-1峰;并且2850和2920 cm-1附近的吸收峰比3107 cm-1附近的吸收峰更为普遍存在.这说明sp3杂化C—H键比乙烯基团的C—H键更广泛存在于金刚石中,从两者的峰值看,天然金刚石中的氢杂质主要以乙烯基团C=CH2存在.3107 cm-1吸收峰与聚集态的氮原子的这种存在关系为天然金刚石形成机制的研究提供了一种新思路,同时较低的合成条件也可能为氢与其他元素共掺杂合成具有n型半导体特性的金刚石提供一个较理想的合成环境.     

Infrared spectra of paraelectric and ferroelectric CsH2PO4

ir spectra are reported for polycrystalline CsH₂PO₄ above and below the transformation temperature, 153 K. Three absorption bands at 1760 cm^-1 2350 cm^-1 and 2800 cm^-1 are assigned to -OHO- vibrations. Whilst the 2350 cm^-1 band remains essentially unaltered, the 1760 cm^-1 band splits into multiplets and the 2800 cm^-1 band shifts to lower frequency on cooling below 153 K. A broad band centred at 3240 cm^-1 is found to exist in the ferroelectric phase and is associated with the -OHO- mode involving the H(2) proton ordered below the transition.     

CF3CDCl2分子红外多光子光热吸收谱

本文报道用铂丝光热吸收池作为探测器得到了CF₃CDCI₂的红外多光子吸收谱。并发现在线性吸收谱中944cm^-1处的吸收峰在多光子吸收谱中分裂为947cm^-1和927cm^-1两个吸收峰。这一现象与科里奥利力和非谐性引起的简正振动的耦合作用有关。这样,在用CF₃CDCI₂/CF₃CHCI₂体系分离氘同位素时,可以根据这一新结果选择更合适的激发波长。实验还发现在线性吸收谱中986cm^-1处的吸收峰在多光子吸收谱中出现约6cm^-2的红移。这种红移现象起源于分子振动能级的非谐性。 关键词：     

3Cu(IO3)2·2H2O晶体的电子结构研究

本文测定了3Cu(IO₃)₂·2H₂O球晶的电子吸收光谱,吸收峰位于9140cm^-1和15250cm^-1。首次观察到了高达6110cm^-1的低对称晶场分裂。吸收曲线经Gauss分解可得到八个Gauss型吸收峰,分别位于8590,10690,10870,12190,13500,14510,15330和16500cm^-1。测量其EPR谱可得g=2.141±0 关键词：     

The rotationally-resolved absorption spectrum of formaldehyde from 6547 to 6804 cm

The room temperature absorption spectrum of formaldehyde, H₂CO, from 6547 to 6804 cm⁻¹ (1527-1470 nm) is reported with a spectral resolution of 0.001 cm⁻¹. The spectrum was measured using cavity-enhanced absorption spectroscopy (CEAS) and absorption cross-sections were calculated after calibrating the system using known absorption lines of H₂O and CO₂. Several vibrational combination bands occur in this region and give rise to a congested spectrum with over 8000 lines observed. Pressure broadening coefficients in N₂, O₂, and H₂CO are reported for an absorption line at 6780.871 cm⁻¹, and in N₂ for an absorption line at 6684.053 cm⁻¹.     

Investigation of the optical absorption and emission spectra of CdCl2: Ni2+ single crystals

The optical absorption, emission, and excitation spectra of CdCl₂: Ni²⁺ single crystals are investigated. The absorption bands around 19,200 cm^-1 are reassigned and a few new bands above 22,000 cm^-1 are observed and assigned to singlet states. The emission bands at 77 K are examined in more detail and the previous assignments seem to be not correct.     

低对称畸变晶场下晶体CsMnBr3吸收光谱分裂的理论解释

考虑晶体CsMnBr₃中Mn²⁺离子所处的低对称畸变晶场——D_3d对称,用赵等人提出的络合物中Mn²⁺的SCF d-轨道,研究了MnBr₆^4-中Mn²⁺的d电子结构以及吸收光谱和晶体结构之间的关系,CsMnBr₃晶体吸收光谱在18280cm^-1,2170Ocm^-1,26300cm^-1和29650cm^-1等处的分裂得到了理论解释,理论和实验符合很好。 关键词：     

Absorption coefficients for hydrogen—III. calculated pressure-induced H2-H vibrational absorption in the fundamental region

The coefficient for absorption during H₂-H collisions was calculated for temperatures from 2000 to 7000 K and wave numbers between 100 and 40 000 cm^-1 for LTE. Because only transitions with Δν = 1 were considered, the absorption was near the fundamental at 4161 cm^-1 in the infrared. The model included mechanical anharmonicity, vibration-rotation interaction, excited vibrational states, and transverse components of the dipole moment. At 5500 cm^-1, 3750° K, and 1 atm pressure, inclusion of H₂-H vibrational absorption increased the absorption of pure hydrogen gas 48 per cent. An approximate formula for the H²-H absorption coefficient is given for rapid calculation.     

Infrared absorption spectra for B- and P-alloyeda-Si: Effects of annealing

The effects of isochronal annealing on the infrared and far-infrared spectra of very heavily B- and P-dopeda-Si(H) are reported. Upon annealing, the B-H stretching mode evolves into two bands centered at 2475 and 2370cm^–1. The broad band of the heavily B-doped samples between 600 and 900cm_-1 is resolved into three peaks or absorption shoulders located at 830, 725, and 630cm_-1. The 640cm_-1 band of the heavily P-doped samples splits into two peaks centered at 630 and 670cm_-1. The assignment of the above peaks is discussed. The intrinsic infrared absorption due to the Si lattice modes changes only little as a result of the annealing. These changes are a measure of the H-induced ir activity of the Si-Si bands.     

中子辐照含氢FZ-Si的红外吸收研究

对于中子辐照的n-FZSi(H₂),利用红外吸收光谱研究了由于辐照所产生的各种与氢有关的缺陷态。在未辐照的样品和辐照的样品中分别发现了未曾报道的1992cm^{-1和1857cm-1吸收峰。对于在n-FZSi(H₂)所引起的本征吸收峰和辐照损伤吸收峰,进行了讨论和指派。2150cm-1吸收峰则被认为是由于氢施主所引起的。 关键词：}     

The infrared absorption of OH in ZnWO4 and ZnWO4: Fe single crystals

OH^--ions play an important role in the charge compensation of defects in ZnWO₄. The interstitial OH in ZnWO₄: Fe affects the optical properties, resulting in a sharp symmetric absorption peak at 3445 cm^-1 (RT). The substitutional OH in pure ZnWO₄ produces a broad absorption band at 3420 cm^-1 (RT). The characteristics of both bands are studied at low temperature and in polarized light respectively. The effects induced by the isotopic substitution of H with D are also considered.     

Vibrational spectra of antiferromagnetic FeBO3

Transmission spectra of powdered ferric borate have been measured in the wave number region from 6000 cm^-1 to 30 cm^-1 at room and liq. N₂ temperatures. Eight absorption bands observed are assigned as three A_2u and five E_u phonon modes. Of those modes, the temperature dependence of the E_u mode ar 230 cm^-1 (300 K) and the A_2u mode at 277 cm^-1 (300 K) have been measured in the temperature range containing the Néel temperature. They do not show the influence of magnetic ordering.     

Pressure-induced ultraviolet absorption in rare gases: Absorption coefficients for mixtures of Xe and Ar at pressures up to 40 atm in the vicinity of 147 nm

Absorption coefficient κ_υ for mixtures of Xe (0.2–20 kg/cm²) and Ar (5–40 kg/cm²) has been measured in the range 0.1 cm^-1 < κ_υ < 40 cm^-1. Exponential and power dependencies of κ_υ on wavenumber were observed and are discussed. The κ_υ-dependencies on the pressure of mixture components are explained by photon absorption at multiparticle collisions of Xe and Ar atoms.     

室温下1.3μm附近CO2的高灵敏度半导体激光吸收光谱

用DFB（分布反馈）半导体激光器结合波长调制吸收光谱技术观测了CO2在1.31μm附近的泛频吸收光谱，并获得的相应的光谱参数（如：谱线位置，谱线强度以及自加宽系数），同时发现了15条弱的新谱线。在665 Pa压力下，本实验可探测的最弱谱线是2.25163′10-27 cm-1/(molecule×cm-2)，相应的吸收是3.88′10-8。     

Absorption of CO laser radiation by NO

Absorption of CO i.r. laser radiation by NO has been studied over the temperature range 300°–4000°K using a grating-tunable CO laser in conjunction with a room-temperature absorption cell and a shock tube. The CO laser line with strongest absorption at elevated temperatures was determined to be the V = 7 → 6, J = 12 → 13 line at 1935.4817 cm^-1, which is nearly coincident with the ²Π_{$\text{3}\text{2}$}V = 0 → 1, J = 37/2 → 39/2 transition in NO. The absorption cell measurements (300°K) were used to infer the position of the NO absorption line (a Λ-doublet at 1935.492 and 1935.497 cm^-1) as well as collision-broadening parameters in pure NO and NO dilute in foreign gases: 2γ° (collision-broadened full width at half maximum in cm^-1 atm^-1 at 300°K) = 0.110, NO-NO; 0.072, NO in Ar; 0.069, NO in Kr; 0.109, NO in N₂. Calculations of the NO absorption coefficient at 1935.4817 cm^-1 are presented for a range of conditions applicable to current studies in combustion and NO_x kinetics. Shock tube measurements (630°–4000°K) supporting these calculations are also reported.     

Absorption of Dy3+ and Nd3+ ions in BaR 2F8 single crystals

The Dy³⁺ absorption and excitation spectra of BaY₂F₈ and BaYb₂F₈ single crystals are investigated in the ultraviolet, vacuum ultraviolet, and visible ranges at a temperature of 300 K. These crystals exhibit intense broad absorption bands due to the spin-allowed 4f-5d transitions in the range (56–78) × 10^?3 cm^?1 and less intense absorption bands that correspond to the spin-forbidden transitions in the range (50–56) × 10^?3 cm^?1. The Nd³⁺ absorption spectra of BaY₂F₈ single crystals are studied in the range (34–82) × 10^?3 cm^?1 at 300 K for different crystal orientations.     

Yb:Y2－2xLa2xO3激光透明陶瓷的光谱性能

对一种低温易烧结的Yb:Y_2-2xLa_2xO₃激光透明陶瓷的光谱性能进行了初步研究，Yb:Y_2-2xLa_2xO₃激光透明陶瓷具有宽的吸收带和大的吸收截面，在最强的吸收峰977nm处吸收截面达4.0×10^-20cm²；其荧光发射寿命为1.1ms，发射截面在1033nm处为1.0×10^-20cm²，在1077nm处为0.7×10^-20cm².Yb:Y_2-2xLa_2xO₃陶瓷的各项光学性能指标接近或达到单晶的指标. 关键词： 氧化镧钇 激光陶瓷 低温烧结 光谱性能