A case of fatal disseminated intravascular coagulation following administration of a non-ionic contrast medium during an arteriography is reported. The authors discuss the incidence and the possible causes of this rare but life-threatening adverse effect. Les auteurs décrivent une complication fatale de coagulation intravasculaire disséminée, faisant suite à l'injection d'un produit de contraste non ionique, de basse osmolalité, lors d'une artériographie. Ils revoient l'incidence et les mécanismes de cette complication, rare mais gravissime.

Collisional self-broadening coefficients for 21 lines in the P and R branches of the v5 band of C2H2 at low temperature (173 K) have been measured using a tunable diode laser spectrometer and a low-temperature variable path length absorption cell. These lines, with J values ranging from 1 to 25, are located in the spectral range 670-790 cm−1. A semiclassical line-broadening calculation provides satisfactory results when the electrostatic interactions arising from the hexadecapole moment of C2H2 are taken into account. We have also examined the validity of a simple power law governing the temperature dependence of the broadening coefficients.

N 2 -broadening coefficients have been measured for 41 lines in the P, Q, and R banches of the ν 2 band. A semi-classical impact calculation of these collisional broadenings provides results in the P and R branches as well as in the Q branch that for J>10 are generally larger than the experimental data

H2-broadening coefficients have been measured for 29 lines of acetylene in the P and R branches of the ν5 band. These lines, located in the spectral range 640–810 cm−1, were recorded using a tunable diode-laser spectrometer. We obtain broadening coefficients that are significantly larger than previous experimental data. A comparison is also made with results calculated from a semiclassical theoretical model. The validity of this model for a light perturber such as H2 is questioned.

N2-broadening coefficients have been measured for 41 lines (with J values ranging from 2 to 33) of HCN in the P, Q, and R branches of the ν2 band. These lines, located in the spectral range 610–810 cm−1, were recorded with a high-resolution tunable diode-laser spectrometer. A semiclassical impact calculation of these collisional broadenings provides results in the P and R branches as well as in the Q branch that for J > 10 are generally larger than the experimental data.

General Voigt profiles (GVPs), including the speed dependence of collisional cross-sections, have been fitted to the following measured spectral lineshapes: the shapes of the R(7), R(11) and R(14) lines recorded with a tunable diode-laser spectrometer in the v5 band of C2H2 in collision with He and Kr. The various GVPs and the resulting broadening coefficients are almost identical for light pertubers such as He and depend significantly on a simplified form in r-q of the interaction potential for heavy pertubers such as Kr. We consider three GVPs with q = 3 (Voigt function), q = 6 and q = 12, as well as the Galatry profile incorporating Dicke narrowing associated with velocity-changing collisions. The speed-dependent Voigt profile with q = 6 provides generally closer agreement with the spectral data of C2H2-Kr than the other GVPs and leads to Kr-broadening coefficients that are nearly 5% larger than those derived from the conventional Voigt profile.

Self-broadening coefficients for 27 lines of acetylene in the P- and R-branches of the v5 band have been measured at room temperature with a tunable diode-laser spectrometer. We have first calculated these broadening coefficients on the basis of two semi-classical impact models by using a simple intermolecular potential. The quadrupole moment of C2H2 as well as a dispersion parameter have then been determined by fitting the calculated results of our experimental data. We next use the approach of Robert and Bonamy in which the intermolecular potential does not include adjustable parameters and involves the addition of an atom-atom interaction model to the electrostatic interactions. The usual spherical harmonics expansion of the atom-atom potential appears to be quite inadequate at short distances. The results of calculations derived from a rough consideration of the exact radial expansion of the atom-atom potential lead to better agreement for high J lines than those derived from the truncated expansion. It is also shown that the electrostatic contributions arising from the hexadecapole moment of C2H2 are only significant for \m\ > 20.

Pressure-broadening parameters of six lines belonging to the ν5 band of C2H2 in collision with N2 have been measured with a tunable diode-laser spectrometer in order to complete up to J = 33 our earlier measurements (D. Lambot, G. Blanquet, and J. P. Bouanich, J. Mol. Spectrosc.136, 86–92 (1989)) on the broadening of C2H2 by N2 and O2 at 297 K. These N2- and O2-broadening coefficients have been first calculated on the basis of the Anderson-Tsao-Curnutte theory; in this approach, we show that the short-range interactions which contribute significantly to the linewidths are not correctly treated. Next, we consider the improved semiclassical model proposed by Robert and Bonamy. The intermolecular potential consists in the addition of the atom-atom interaction model to the quadrupolar interactions. The limited radial spherical harmonics expansion of the atom-atom potential, from which expressions for the differential cross section were derived, appears to be quite insufficient at short intermolecular distances. Therefore, we use a more accurate representation of this potential, avoiding an inadequate truncation and keeping the analytic expressions obtained by Bonamy and Robert. In the calculations we take into account the contributions derived from the radial functions U000(r), U200(r), and U220(r), as well as from U400(r). A theoretical expression is obtained for the U400 contribution to the differential cross section. The results of the calculations arising from the exact radial expansion of the atom-atom potential appear to be significantly larger for high J lines than those arising from the truncated expansion. The latter results, which do not include adjustable atom-atom parameters, are in good agreement with experimental broadening coefficients for C2H2O2 and in reasonable agreement (except at large J values) for C2H2N2. It is also shown that the contributions to the linewidths derived from U400 are rather small for C2H2N2 and more important for C2H2O2. Finally, by calculating the collisional linewidths of C2H2N2 and C2H2O2 at 200 K, we have predicted their temperature dependences.

ChemInformVolume 21, Issue 30 Physical Organic Chemistry ChemInform Abstract: Spectral Intensities in the ν1 Band of Carbonyl Sulfide and Its Isotopic Species. G. BLANQUET, G. BLANQUET Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorJ. WALRAND, J. WALRAND Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorI. HILGERS, I. HILGERS Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorD. LAMBOT, D. LAMBOT Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this author G. BLANQUET, G. BLANQUET Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorJ. WALRAND, J. WALRAND Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorI. HILGERS, I. HILGERS Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this authorD. LAMBOT, D. LAMBOT Lab. Spectrosc. Mol., Fac. Univ. Notre-Dame de la Paix, B-5000 Namur, Belg.Search for more papers by this author First published: July 24, 1990 https://doi.org/10.1002/chin.199030035AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume21, Issue30July 24, 1990 RelatedInformation

A tunable diode laser was used to perform measurements of absolute lines intensities in the ν1 fundamental of carbonyl sulfide. Spectra have also been recorded for the following isotopic species: 16O12C34S, 16O13C32S and 16O12C33S. The vibrational band strength Sv0 was calculated at 298 K. The absolute intensity for 100% of 16O12C32S species is found to be Sv0 = 29.69 ± 0.15 cm−2 atm−1 with the uncertainty covering three times the standard deviation. We have tried to determine the α-coefficient involved in the Hermann-Wallis factor F = (1 + αm + ⋯)2 and the value is found to be negligible (−5 ± 8) × 10−5. The Sv0 value obtained for the other isotopic species is very close to the normal one.