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1.
Some lines in 5 band of propyne (CH3CCH) and many strongest lines in the 9 band of ethyl- Chloride (C2H5Cl35 A-type) are measured and identified, giving a new set of spectroscopic constants. In particular the ethyl-Chloride set allows to assign all the FIR transitions reported in literature.  相似文献   

2.
The infrared spectrum of stibine, SbH3, has been recorded in the regions between 720 and 1000 cm-1 and between 1750 and 2020 cm-1 at a resolution of about 0.004 cm-1. Rovibrational transitions belonging to the ν2, ν4 bending and ν1, ν3 stretching fundamental bands have been measured and assigned for both 121Sb and 123Sb isotopomers. Strong perturbations due to rovibrational interactions have been observed both in the bending and in the stretching bands. Splittings of the K″=3, 6, and 9 lines have been observed and perturbation-allowed transitions with selection rules Δ (k−?)=±3, ± ±6, and ±9 have been also identified. Simultaneous analyses of transitions belonging to the ν24 or ν13 dyads have been performed. The central frequencies of the hyperfine structures of the rotational transitions in the v2=1 and v4=1 states, recorded in the microwave region by Fourier transform spectroscopy [H. Harder, C. Gerke, and L. Fusina, J. Chem. Phys.114, 3508-3523 (2001)], have been included in the data set. The theoretical model adopted explicitly takes into account the Coriolis interactions between the v1=1 (A1) and v3=1 (E) and between the v2=1 (A1) and v4=1 (E) states, including also several essential resonances within them.  相似文献   

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The hot bands in the ν1, ν2, and ν3 band systems of NC-CC-NC (3-isocyano-2-propynenitrile) have been investigated and transitions from nv9-levels with n up to 4 have been identified. Two weak bands have also been observed in the gas phase infrared spectrum at 2157 and 2410 cm−1, of which the latter is probably 2v4. A preliminary investigation of some analogous hot bands in the v4 band system of the related molecule NC-CC-CN (dicyanoacetylene) is also reported.  相似文献   

6.
在293~393K温度范围内,分别采用一维红外光谱、二阶导数红外光谱和二维红外光谱测定硬脂酸亚甲基面内摇摆振动(ρCH2)。实验发现:在700~750cm-1范围内,硬脂酸ρCHα存在"第一特征谱带"和未见文献报道的"第二特征谱带"。并进一步研究了温度对于硬脂酸ρCH2红外吸收强度及变化顺序的影响。  相似文献   

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Various barium strontium titanate borosilicate glasses were prepared by a rapid melt-quench technique. Spectroscopic studies have been carried out on investigated glasses for their structural information. Infrared and Raman spectroscopic studies showed that these glasses are formed by glass-forming network of borate and silicate as well as network modifiers in the form of cations of alkaline earth atoms. The borate and silicate networks are modified by barium, strontium, titanium, and iron cations in glass matrix. The network of triborate unit is modified in tetraborate unit by adding ferric oxide in a glassy matrix. The optical studies are performed by ultraviolet-visible spectroscopy and it confirms that the band gap decreases with increase in the concentration of ferric oxide.  相似文献   

8.
自然老化谷类种子的二维红外光谱研究   总被引:1,自引:0,他引:1  
种粮老化影响种子活力及粮食品质。利用傅里叶变换红外光谱(FT-IR),二阶导数红外光谱(SD-IR)和二维相关红外光谱(2D-IR)方法对不同储藏年份的大麦,小麦,稻谷,玉米和高粱种子进行区分研究。结果显示,原始光谱中几个峰强比有差异;在二阶导数红外光谱中,不同储藏年份种子在1 800~800 cm-1范围内的吸收峰强度和形状显示出差异。二维相关红外光谱结果显示:大麦在1 350~1 800 cm-1,小麦,稻谷,玉米和高粱在860~1 690 cm-1范围内有明显差异,随储藏年份增加,自动峰和交叉峰的数目减少,强度减弱。结果表明,应用傅里叶变换红外光谱结合二维相关红外光谱能有效快速地区分不同储藏年份的谷类种子。  相似文献   

9.
The four fundamental bands of 70GeD4 have been analyzed using the STDS software developed in Dijon (http://www.u-bourgogne.fr/LPUB/sTDS.html). Both infrared and Raman spectra were used to observe all fundamental bands. Infrared spectra of monoisotopic 70GeD4 were recorded in the regions 600 and 1500 cm−1 using the Bruker 120HR interferometer at Wuppertal. The resolution (1/maximum optical path difference) was between 2.3 and 3.3×10−3 cm−1 for the ν3 and ν4 infrared-active fundamental bands as well as for the interacting ν2 band. A high-resolution stimulated Raman spectrum of the ν1 band has been recorded in Madrid. The instrumental resolution of the Raman spectrum was 3.3×10−3 cm−1. We have performed a global fit of the ground state, ν24 bending dyad, and ν13 stretching dyad. We have used 1146, 139, and 676 assigned lines for ν24, ν1, and ν3, respectively. The standard deviation is 2.2×10−3 cm−1 for the bending dyad, 1.6×10−3 cm−1 for the ν3 infrared lines, and 1.7×10−3 cm−1 for the ν1 Raman lines. These results enabled us to perform the first experimental determination of the equilibrium bond length of germane as re=1.5173(1) Å.  相似文献   

10.
泡沫红外消光影响因素的实验研究   总被引:4,自引:0,他引:4  
赵军  潘功配  陈昕 《光学学报》2007,27(10):1883-1888
通过红外光谱实验和红外热成像实验,研究了影响泡沫红外消光的因素,结果表明:泡沫溶液的红外光谱特征决定红外光谱吸收峰位,且溶质浓度越高,吸收越强;泡沫结构是造成光线强烈衰减的重要原因,透射光强随光线穿过泡沫液膜界面的次数成指数衰减,泡沫直径越小,达到相同遮蔽效果的泡沫溶液的用量就越少;当泡沫直径远大于入射光线波长时,透射比随光束大小变化不大;泡沫溶液升温可在一定程度上增强泡沫的红外吸收强度.各因素影响程度从大到小的次序为:泡沫结构,红外光谱特征,内充气体折射率,泡沫直径,温度.  相似文献   

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