Biomedical subjects

N Lacome

Publications and source records attributed to N Lacome.

3 recordsLinked to original sources

PubMed1999

The NO Dimer.

Spectra of the symmetric nu1 vibration of the NO dimer have been recorded in gas phase at low temperature, with a high-resolution infrared Fourier transform spectrometer. All the lines were least-squares fitted to a Voigt profile convoluted with the well-known apparatus function of the spectrometer. By means of this method, the frequencies of more than 109 new lines were measured. From the intensities of a set of 33 well-fitted and completely isolated lines, the transition moment was extracted. NO-broadening coefficients of the dimer lines were also measured as well as the predissociation time, which was found to be (2.65 +/- 0.53) ns. Copyright 1999 Academic Press.

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PubMed1998

The NO Dimer: Jet-Cooled Study of nu1 and nu5 Transitions.

The symmetric nu1 and antisymmetric nu5 vibrations of (NO)2 have been recorded at very low rotational temperature (4 K) using a molecular jet coupled with a high-resolution Fourier transform spectrometer (Bruker IFS 120 HR). A White-type multipass setup allowed us to record the very weak absorption of this dimer. A vibrational predissociation time equal to 75 ps was measured for the nu5 band, in good agreement with values directly derived from photodissociation measurements. This result shows that previous data obtained from spectra recorded using a low-temperature cell at thermodynamical equilibrium were distorted under the effect of molecular collisions. Copyright 1998 Academic Press.

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PubMed1998

Methyl Chloride nu5 Region Lineshape Parameters and Rotational Constants for the nu2, nu5, and 2nu3 Vibrational Bands.

Fourier spectra of methyl chloride have been obtained at ambient laboratory temperature under self-broadening conditions. Five thousand two hundred and sixty rovibrational transitions of the (nu2, nu5, 2nu3)-vibrational-band triad have been assigned, and new ground and excited state rotational constants for CH335Cl and CH327Cl have been determined. The nu5 and nu2 vibrational-band intensities are determined to be, respectively, 42(1.2) and 31.7(0.9) cm-2 atm-1. Self-broadening coefficients of individual rovibrational lines are determined for the nu5 band of CH335Cl and CH337Cl at 296 K. The self-broadening coefficients peak broadly close to the maximum in the Boltzmann rotational population; no specific trends of the broadening coefficients are observed with the rotational quantum number K. With the exception of the RQ(J, 0) branch, the 1260-1650 cm-1 spectral region can be well modeled by the superposition of overlapping Voigt line profiles. To adequately model the densely packed RQ(J, 0) branch, however, we included collisional line mixing with A+ to A- in addition to A- to A- and A+ to A+ |DeltaJ| >/= 1, DeltaK = 0 collisional transitions allowed. Copyright 1998 Academic Press.

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