Author Institution: Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces, Universite de Skikda,; BP 26, Skikda 21000, Algeria; Laboratoire de Physique Moleculaire et Applications, CNRS, case courrier 76,; Universite Pierre-et-Marie-Curie, 75252 Paris Cedex 05, France; Groupe de Spectrometrie Moleculaire et Atmospherique, CNRS, UMR 6089,; Universite de Reims-Champagne-Ardenne, Faculte des Sciences, BP 1039, 51687 Reims Cedex 2, France; Laboratoire de Photophysique Moleculaire, Unite Propre du C.N.R.S., Batiment 350,; Universite de Paris-Sud, 91405 Orsay, France, email: nathalie.picque@ppm.u-psud.fr

Using Fourier transform spectra and a multispectrum fitting procedure, 271 absolute line intensities of (CO2)-C-12-O-16 have been measured around 1.6 mu m, for the three cold bands 30014-00001, 30013-00001, and 30012-00001, and for the two hot bands 31113-01101 and 31112-01101, extending from 6035 to 6380 cm(-1). Accuracies are on the average 3 and 5% for cold and hot bands, respectively. Vibrational transition dipole moments and Herman-Wallis coefficients are reported for each band. Comparisons are made with previous experimental results and with data available in the HITRAN database and the Carbon Dioxide Spectroscopic Databank (CDSD). (C) 2006 Elsevier Inc. All rights reserved.

Using Fourier-transform spectra and a multispectrum fitting procedure, 124 absolute line intensities of 12C16O2 are obtained for the cold band 30011–00001 and the hot band 01131–01101 between 6460 and 6950cm−1. Vibrational transition dipole moments squared and Herman–Wallis coefficients are reported for each band. Cross comparisons made with previous experimental results and with data available in the HITRAN and Carbon Dioxide Spectroscopic Databank (CDSD), bring some confidence on the good level of accuracy of the present results. Motivated by the demanding needs of some atmospheric experiments dedicated to the survey of the carbon cycle, an additional evaluation of potential absolute line intensity measurement limit is also performed on recently published carbon dioxide absolute line intensity independent measurements. These are obtained in two different laboratories on the bands 30013–00001 and 30012–00001 both located in the 1.6μm spectral window. It is shown that Fourier-transform experimental CO2 line intensity determination is approaching the challenging required figure of about 0.3% accuracy needed for the survey of the atmospheric carbon cycle.

The emission of the 1-0, 2-1, 3-2, 4-3, 5-4 vibration-rotation bands in the X3Σ− state of NH has been observed from 2275 to 3460 cm−1 by high-resolution Fourier transform spectroscopy. The bands 2-1, 3-2, 4-3, 5-4 are given for the first time. Molecular constants σ0v, Bv, Dv, Hv, λv, λD,v, γv, γD,v determined from a nonlinear least-square fit with a RMS equal to 0.5 10−3 cm−1 are reported, for practically all six v together with about 800 calculated wavenumbers. This large amount of accurate information in the fundamental electronic state of the radical imine should be helpful for the investigation of astrophysical sources, of atmospheres, and for diagnostics of various plasmas in the laboratory.

The emission spectrum of a plasma of silane flowing through a multipass reactor and excited by a radio frequency discharge has been recorded with a high information Fourier transform spectrometer. 192 rovibrational transitions of the 28SiH radical, between 1800 and 2150 cm−1, have been measured in the electronic ground state. These transitions are related to the fundamental band 1–0 and the two hot bands 2–1 and 3–2. A least squares procedure have led to the determination of a unique set of 25 accurate molecular constants for the vibrational levels v=0, 1, 2, 3 of the X 2Π state. The standard deviation on the calculated frequencies is 7×10−4 cm−1.

Author Institution: Laboratoire d'Infrarouge, Laboratoire Associe au C.N.R.S., Universite de Paris XI