CAVITY RING-DOWN SPECTROSCOPY OF O2-O2 COLLISIONAL INDUCED ABSORPTION M. SNEEP and W. UBACHS
نویسندگان
چکیده
Absolute cross sections (peak and band-integrated) for collision-induced absorption features in oxygen at 630, 577 and 477 nm are determined using the laser-based technique of cavity ring-down spectroscopy. A wavelength-dependent background, Rayleigh scattering extinction and oxygen-monomer absorption are unraveled from the collision-induced features and its quadratic pressure dependence is demonstrated for sub-atmospheric pressures
منابع مشابه
Deep-ultraviolet cavity ringdown spectroscopy.
The sensitive optical detection technique of cavity ringdown spectroscopy is extended to the wavelength range 197-204 nm. A novel design narrowband Fourier-transform-limited laser is used, and the technique is applied to gas-phase extinction measurements in CO2, SF6, and O2. Further demonstration of the system capabilities is given in high-resolution recordings of the Schumann-Runge (0, 0), (1,...
متن کاملCavity ring - down spectroscopy of H 2 18 O in the range 16 570 – 17 120 cm 1 q
Cavity ring-down spectroscopy is used to record an absorption spectrum of H2 O water vapor in the 16 570–17 120 cm 1 region. In the spectrum, 596 lines are identified as belonging to H2 O, of which 375 lines are assigned by comparing to newly calculated theoretical lines. The spectrum covers the entire 5m polyad and two new vibrational band origins, (321) at 16775.381 cm 1 and (401) at 16854.99...
متن کاملDeep - UV high resolution cavity ring - down spectroscopy of the Schumann – Runge bands in 16 O 2 and 18 O 2 at wavelengths 197 – 203 nm
With the use of a novel titanium:sapphire laser source delivering, upon fourth harmonic generation, narrowband and tunable radiation in the deep-UV, spectroscopic studies were performed on weak Schumann–Runge bands of oxygen. Improved values for rotational and fine structure molecular parameters for the BR u , v = 0–2 states of O2 were determined, as well as values for the v = 0–1 states in O2....
متن کاملVisible absorption bands of the (O2)2 collision complex at pressures below 760 Torr.
The collision-induced absorption of oxygen in the 540-650-nm wavelength region has been measured ata pressure range from 0 to 730 Torr at T 5 294 K. Pressure-dependent cross sections of the X 3Sigmag(+)+X 3Sigmag alpha 1Deltag(nu =0) + alpha 1Deltag(nu = 1 ) and X 3Simag(+)+ X 3Sigmag+--> alpha 1Deltag(nu =0) + 1 alpha 1Deltag (nu = 0) transitions have been determined by means of cavity-ringdow...
متن کاملA calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation
An efficient calibration method has been developed for broad-bandwidth cavity enhanced absorption spectroscopy. The calibration is performed using phase shift cavity ring-down spectroscopy, which is conveniently implemented through use of an acousto-optic tunable filter (AOTF). The AOTF permits a narrowband portion of the SC spectrum to be scanned over the full high-reflectivity bandwidth of th...
متن کامل