Mesures par spectroscopie à transformée de Fourier infrarouge de paramètres spectraux absolus pour des molécules d'intérêt atmosphérique

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Absolute line intensities in acetylene: The 1.5-μm region

We measured 305 absolute line intensities in the ν1 + ν3(∑u+)-0(∑8+) band of 12C2H2 and 13C12CH2 and the ν1 + ν2 + (ν41 + ν5-1)0(∑u+)- 0(∑8+), ν1 + ν3 + ν41 (Πg)-ν41 (Πg), and ν1 + ν3 + ν51 (Πu)-ν51(Πu) bands of the main isotopomer, all observed near 1.5 μm. The absolute intensity of these bands are respectively 6.4882 (34), 0.12337 (10), 0.083746 (71), 0.58771 (28), and 0.32126 (11) cm-2 atm-1 at 296 K. In addition, we also determined Herman-Wallis factors for the first time in this spectral region. © 2002 Elsevier Science (USA).SCOPUS: ar.jinfo:eu-repo/semantics/publishe

ABSOLUTE LINE INTENSITIES IN 12C2H2^{12}C_{2}H_{2}: THE 1.5μ1.5\mu REGION

Author Institution: Laboratoire de Chimie Physique Mol\'{e}culaire C. P. 160/09, Universit\'{e} Libre de BruxellesIn the line of our activities aiming at providing reference spectroscopic information in the near infrared range, we measured absolute line intensities in 5 bands of acetylene observed around $1.5 \mu$: the $\nu_{1} + \nu_{3}$ band and 3 hot bands involving excitation of the bending modes $\nu_{4}$ and $\nu_{5}$ of $^{12}C_{2}H_{2}$ and the $\nu_{1} + \nu_{5}$ band of $^{13}C^{12}CH_{2}$. These measurements were performed on spectra recorded at a resolution of $0.009 cm^{-1}$ (Maximum Optical Path Difference = 100 cm) using a Bruker IFS120HR Fourier transform spectrometer. Five spectra were actually recorded at room temperature, with sample pressure - absorption path length products ranging from 0.67 to 2700 mbarxm. Results will be presented and discussed

Absolute line wavenumbers in the near infrared: 12C2H2 and 12C16O2

40 absolute line wavenumbers in the 3v3 band of 12C16O2 between 6927cm-1 and 6989cm-1 and 626 absolute line wavenumbers in the near infrared absorption spectrum of 12C2H2 between 7060cm-1 and 9900cm-1 have been measured using high resolution Fourier transform spectroscopy. The calibration of the CO2 line wavenumbers relied on heterodyne frequencies available in the v1 + v3 band of 12C2H2 near 6556 cm-1. The absolute uncertainty of the calibrated acetylene line wavenumbers is estimated to 0.000 08 cm-1. The acetylene spectra were calibrated using heterodyne frequencies available in the 2-0 band of 12C16O and the line wavenumbers obtained in the 3v3 band of 12C16O2. The absolute uncertainty of the calibrated acetylene line wavenumbers is estimated to range from 0.0003 cm-1 to 0.006 cm-1 for strong to very weak isolated lines. Comparison with absolute line wavenumbers obtained independently at JPL in the 3v3 band of 12C2H2 near 9649 cm-1, calibrated using absolute wavenumbers available in the 2-0 and 3-0 (near 6350 cm-1) bands of 12C16O, shows very good agreement. Also, the vibration-rotation constants for the observed upper vibrational states of 12C2H2 were determined, but without accounting for the perturbations affecting these states.SCOPUS: cp.jinfo:eu-repo/semantics/publishe