Etudes spectroscopiques des molécules C2H2, HCOOH et CH3CHO fortement excitée vibrationnellement :développements instrumentaux laser, réactivité intramoléculaire et effets de pression

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Etudes spectroscopiques des molécules C2H2, HCOOH et CH3CHO fortement excitée vibrationnellement :développements instrumentaux laser, réactivité intramoléculaire et effets de pression

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Fourier transform infrared jet spectroscopy using a heated slit source

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

FTIR Jet Spectroscopy Using a Heated Slit-Source

info:eu-repo/semantics/publishe

Ar-induced pressure effects in the ν1+3ν3 absorption band in 12C2 H2

We have used a Ti:sapphire autoscan laser spectrometer to measure Ar-induced pressure-broadening, narrowing and shift effects for 24 individual vibration-rotation lines in the ν1+3ν3 band of 12C2H2. The acetylene and total pressures ranged between 10 and 20 Torr, and between 30 and 310 Torr, respectively. The Voigt profile accounted for the higher pressure measurements while the soft and hard collision profiles were required to fit the lower pressure measurements. Lineshift parameters that are significantly different from the overall behaviour in the band were observed for the R(17) and P(19) lines and are qualitatively attributed to the influence of an intramolecular Coriolis-type coupling on the interparticle interaction potential. Those results confirm all trends of self-collisional measurements recently reported for this band.info:eu-repo/semantics/publishe

Absolute line intensities in the ν1 + 3ν3 band of 12C2H2 by laser photoacoustic spectroscopy and Fourier transform spectroscopy

Line intensities and self-broadening coefficients in the ν1 + 3ν1 band of 12C2H2 near 0.8 μm at room temperature were measured by means of both laser photoacoustic and Fourier transform spectroscopy. An experimental protocol has been developed to obtain absolute intensities from the photoacoustic measurements. Namely, the spectrometer was calibrated using water vapour line intensities available in Hitran 1996 [L. S. Rothman et al. (1998) J. quant. Spectrosc. Radiat. Transfer, 60, 665-710]. These photoacoustic line intensities were found to be on average 5% higher than corresponding measurements performed using Fourier transform spectroscopy, the accuracy of the latter being estimated to better than 4%. The accuracy of the photoacoustic intensities is discussed. Previous results from the literature [F. Herregodts, D. Hurtmans, J. Vander Auwera, and M. Herman (1999) J. chem. Phys. 111, 7954-7960] are revised.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Laser spectroscopy of the v1+3v3 absorption band in 12C2H2. I. Pressure broadening and absolute line intensity measurements

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Laser spectroscopy of the v1+3v3 absorption band in 12C2H2. II. Self-collisional lineshift measurements

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Spectroscopic and Ab Initio Investigation of the νOH Overtone Excitation in Trans-Formic Acid

info:eu-repo/semantics/publishe

Total intravenous anesthesia and high-frequency jet ventilation during transthoracic endoscopic sympathectomy for treatment of essential hyperhidrosis palmaris: A new approach

Objective: To evaluate the effects of high-frequency jet ventilation (HFJV) applied to both lungs on hemodynamic parameters, oxygenation, and operating conditions during bilateral videothoracoscopic sympathectomy. Design: A prospective, unblinded study. Setting: An ambulatory surgical unit at a university medical center. Participants: 30 patients (11 men, 19 women), ASA status I. Intervention: Bilateral videothoracoscopic sympathectomies were performed using total intravenous anesthesia with propofol, alfentanil, and atracurium, and the patients were ventilated with an oxygen-air mixture using HFJV delivered to both lungs with a Hi-Lo Jet tracheal tube (Mallinckrodt). Measurements and Main Results: Mean total anesthesia time was 55 ± 13 minutes. Hemodynamic parameters remained stable during surgery, although ablation of the sympathetic ganglia induced three incidences of bradycardia (10% of the patients), which were responsive to atropine. Four patients developed oxygen desaturation (Sa O2 < 90%) after the creation of the pneumothorax. Surgical conditions were considered excellent by the surgeons. Concerning postoperative complications, a temporary Horner's syndrome was observed in one patient. Another patient had a mild residual pneumothorax on the first postoperative day that resolved without insertion of a chest tube. Conclusions: It was concluded that HFJV applied to both lungs is an easy and safe anesthetic technique that provides excellent surgical conditions and causes a minor incidence of morbidity.SCOPUS: ar.jinfo:eu-repo/semantics/publishe