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- W603548844 abstract "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 Universitat 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" @default.
- W603548844 created "2016-06-24" @default.
- W603548844 creator A5051720017 @default.
- W603548844 date "2011-09-15" @default.
- W603548844 modified "2023-09-24" @default.
- W603548844 title "Rovibrational study of DNO3 nu5 band and collisional effect studies of CH3F microwave spectra with and without Stark effect" @default.
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- W603548844 hasPublicationYear "2011" @default.
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