Intensités des raies d'absorption des bandes perturbées ν4 et 3ν6 de 12CH335Cl

Strengths of individual lines of the ν4 and 3ν6 bands of methyl chloride at 3.3 μm have been measured using a high resolution Fourier transform interferometer. From these measurements we were able to deduce two significant intensity parameters, namely the unperturbed band strength of the ν4 band, [Formula: see text] at 296.35 K and the coefficient β1 = −0.0018 ± 0.0009 of the Herman–Wallis term F = [1 + ε(ν4, J, K, J + ΔJ, K + ΔK)]2 = (1 + β1m + … )2

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Étude des bandes infrarouges en résonance 2ν2, ν2 + ν5, , , 2ν3 + ν5 et 4ν3 du chlorure de méthyle

Canadian Journal of Physics ◽

10.1139/p82-116 ◽

1982 ◽

Vol 60 (6) ◽

pp. 825-843 ◽

Cited By ~ 9

Author(s):

Najath Binsari-Zizi ◽

Claude Alamichel ◽

Guy Guelachvili

Keyword(s):

Fourier Transform ◽

Standard Deviation ◽

High Resolution ◽

Least Squares ◽

Methyl Chloride ◽

Coupling Model ◽

Fermi Resonance ◽

Simplified Model ◽

Interaction Scheme ◽

Very High

The spectrum of methyl chloride has been analyzed between 2650 and 2950 cm−1 from Fourier transform recordings obtained with a very high resolution. More than 3000 lines of CH335Cl and more than 1500 lines of CH337Cl, most of them belonging to ν2 + ν5 and [Formula: see text], have been assigned: the 2ν2, [Formula: see text], 4ν3 and 2ν3 + ν5 bands are very weak and only appear when there are level crossings. The main interaction is the Coriolis resonance between the ν2 and ν5 modes, which links the rovibrational levels six by six. The Fermi resonance between [Formula: see text] and ν1, whose existence has just been shown, does not seem to have important consequences. Numerous other resonances, particularly making the 4ν3 and 2ν3 + ν5 bands visible, must be added to the basic coupling model; they make the general interaction scheme extremely complex. A least squares calculation, according to a simplified model, has given a standard deviation of 0.029 cm−1 over 784 lines of CH337Cl, from which crossings and locally perturbed subbands were excluded.

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Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19852480 ◽

1985 ◽

Vol 50 (11) ◽

pp. 2480-2492 ◽

Cited By ~ 12

Author(s):

Soňa Přádná ◽

Dušan Papoušek ◽

Jyrki Kauppinen ◽

Sergei P. Belov ◽

Andrei F. Krupnov ◽

...

Keyword(s):

Fourier Transform ◽

High Resolution ◽

Ground State ◽

Unitary Transformation ◽

Point Of View ◽

Acoustic Detection ◽

Molecular Parameters ◽

Microwave Spectrometer ◽

Fourier Transform Spectra ◽

First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

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