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Etude rovibrationnelle de la bande nu5 de DNO3 et l´étude des effets collisionels dans les spectres microonde de CH3F sans et sous effet Stark

机译:Dna3 nu5波段的振动研究以及在没有和处于Stark效应下的CH3F微波光谱中的碰撞效应研究

摘要

The work presented in this thesis belongs to the domain of theoretical and experimental gas phase molecular spectroscopy. It consists of two parts dedicated to two relatively different aspects in this field. The first part presents a high resolution analysis of the ν5 fundamental band (NO2 in plane bending mode) positions and intensities of D14NO3 (deuterated nitric acid) in the 11 µm spectral region. For this study, we used an infrared spectrum of D14NO3 recorded in the 700−1400 cm−1 region on a Fourier transform spectrometer at Bergische Universität in Wuppertal (Germany). Our analysis demonstrates that the fundamental ν5 band centered at 887.657 cm−1 is strongly perturbed. Indeed, it proves that 5^1 and 7^1+9^1 energy levels of DNO3 are coupled through A and B type Coriolis resonances. The resonance scheme for the isotopologue D14NO3 therefore differs substantially from the schemes of H14NO3 and H15NO3 that feature dominantly Fermi type resonances. The second theme treated in this work is devoted to the lineshapes of pure rotational transitions of CH3F with the study of collisional broadening (collisions CH3F-CH3F and CH3F-He) of optical transitions and their Stark components. The microwave measurements were realised at ICT in Prague. Their analysis enabled to provide collisional parameters using various line profiles (Voigt, Rautian, Speed dependent) for the J, K → J + 1, K (K = 0, …, J) transitions with J = 1 and J = 3 as well as for their various Stark components J, K, M → J + 1, K, M' (|M| = 0, …, J ; |M − M'| = 0, 1). Moreover, a correct use of model based on Infinite Order Sudden approximation led to very satisfactory results of the observed line-mixing effects. The retrieved experimental results complete and extend the previous studies and provide the first successful demonstration of the ability of the IOS approximation to model line-mixing effects among Stark transitions
机译:本文提出的工作属于理论和实验气相分子光谱学领域。它由两部分组成,分别致力于该领域中两个相对不同的方面。第一部分对11 µm光谱区域中ν5基带(平面弯曲模式下的NO2)的位置和D14NO3(氘代硝酸)的强度进行了高分辨率分析。在这项研究中,我们使用了伍珀塔尔(Wuppertal)伯吉斯大学(BergischeUniversität)的傅立叶变换光谱仪在700-1400 cm-1区域记录的D14NO3的红外光谱。我们的分析表明,以887.657 cm-1为中心的基本ν5带受到强烈干扰。实际上,它证明DNO3的5 ^ 1和7 ^ 1 + 9 ^ 1能级通过A型和B型科里奥利共振耦合。因此,同位素同位素D14NO3的共振方案与主要以费米型共振为特征的H14NO3和H15NO3的方案大不相同。这项工作中涉及的第二个主题是通过研究光学跃迁及其Stark分量的碰撞加宽(碰撞CH3F-CH3F和CH3F-He)研究CH3F的纯旋转跃迁的线形。微波测量是在布拉格的ICT上实现的。他们的分析使得能够使用各种线轮廓(Voigt,Rautian,速度相关)为J,K→J + 1,K(K = 0,…,J)过渡提供碰撞参数,其中J = 1和J = 3关于它们的各种Stark分量J,K,M→J + 1,K,M'(| M | = 0,…,J; | M − M'| = 0,1)。此外,基于无限次突然逼近的模型的正确使用导致观察到的线混合效果的结果非常令人满意。检索到的实验结果完善并扩展了先前的研究,并首次成功证明了IOS近似能够在Stark过渡之间模拟线混合效应的能力

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    Koubek Jindrich;

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  • 年度 2011
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