0000000000585274
AUTHOR
R. Chaux
Wavelengths Measurements of Continuous Wave Lasers with a Wavemeter - Applications to High-Resolution Raman-Spectra Calibration
0150-536X
Relative line intensity measurement in absorption spectra using a tunable diode laser at 1.6 um: application to the determination of (13CO2)/(12CO2) isotope ratio
0946-2171; The measurement of relative intensities in CO2 combination bands spectrum is performed using wavelength modulation spectroscopy (WMS) and a DFB (distributed feedback) diode laser operating at 1.6 mum. The diode laser is stabilized with an external Fabry-Perot interferometer and absorption spectroscopy is performed in a multipass gas cell. A spectrum containing spectral lines of both 13CO2 and 12CO2 isotopic species is recorded. The variation of laser power during frequency scanning and the line shape are taken into account to accurately extract line intensities from experimental data. The isotopic concentration ratio is deduced from the intensity ratio. Both ratios are measured w…
Accurate Spectroscopic Constants of Nitrogen Determined from Stimulated Raman Spectra of the Fundamental and 1st Hot Bands
0377-0486; Nitrogen specta of the Q-branch of the fundamental and the first hot bands were recorded with a high-resolution stimulated Raman spectrometer at atmospheric pressure and ca. 1300 K. The absolute frequencies of the Raman lines were measured with high accuracy, leading to a refinement of spectroscopic constants. A temperature estimation was also performed from the Raman intensities.
Collisional Line Broadening and Line Shifting in N2-CO2 Mixture Studied by Inverse Raman-Spectroscopy
0301-0104