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In this paper we discuss the hyperfine structure and isotope shift of the xenon atom. The study was performed using a semiconductor diode laser mounted in an extended-cavity configuration and emitting in the near-infrared range of spectrum. Doppler-free spectra of four transitions between 820 and 830 nm were obtained by using either a saturation spectroscopy technique in a cell or a laser-induced fluorescence technique on a collimated atomic metastable beam. The hyperfine coupling constants of 129 Xe and 131 Xe were determined for the levels 1s 5 , 1s 4 , 1s 2 , 2p 2 , 2p 4 , and 2p 6 ͑Paschen notation͒. Moreover, a systematic study of the isotope shift was performed for the 1s 3 →2p 4 (ϭ820.8 nm) and 1s 5 →2p 6 ͑ϭ823.3 nm͒ transitions for which all the stable isotopes 128-131 Xe, 132 Xe, 134 Xe, and 136 Xe were fully resolved.

High-resolution infrared spectra have been measured for mixtures of CHF 2 Cl in Ne, expanded in a supersonic planar jet. We present the analysis for the ν 3 and ν 8 fundamentals of CHF 2 35 Cl and CHF 2 37 Cl. C 2001 Academic Press

The traditional Cole or CFC basic model might offer too coarse estimations in personalized lhaemodialytic treatment. To take advantage of the full information content offered by BIS ins$rumentation the traditional CFC model can be extended into a more convenient model: the Extended CFC (ECFC) model. The ECFC model is used to fit raw bioimpedance measurements to increase the overall estimation accuracy of Rlesistance and Reactance terms. An experimental comparison between CFC, ECFC model simulations, and experimental data is presented. Experimental results show that higher accuracies (at leas? a tenfold improvement) over the traditional CFC model are easily achieved.

High resolution (0.0011 cm À1 full width half maximum) diode laser spectra have been measured for mixtures of CF 2 Cl 2 in Ne, expanded in a supersonic planar jet. In addition interferometric Fourier transform infrared (FTIR) spectra have been recorded with a resolution of about 0.004 cm À1 (FWHM, Hamming apodization) for neat CF 2 Cl 2 , expanded through a circular 200 mm nozzle. We present the analysis of the n 3 + n 7 combination band of CF 2 35 Cl 2 [ñ n 0 ¼ 888.496 89(10) cm À1 ] and CF 2 35 Cl 37 Cl [ñ n 0 ¼ 883.203 89(12) cm À1]. Absolute band strengths have been measured for all bands falling in the atmospheric window (n 3 + n 7 , n 6 , n 1 and n 8 ) and thus being important for monitoring CF 2 Cl 2 in the lower troposphere and stratosphere. A Fermi resonance coupling constant W ¼ (15 AE 2) cm À1 is estimated for the resonance between n 3 + n 7 and n 6 in both isotopomers.