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Reference : UMR8539-ISARIC-045
Workplace : PALAISEAU
Date of publication : Tuesday, February 23, 2021
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 May 2021
Proportion of work : Full time
Remuneration : According to past experience and based on CNRS standards
Desired level of education : PhD
Experience required : Indifferent
The postdoctoral researcher will perform research works within the frame of a project of numerical climate simulations of CO2-enriched planetary atmospheres for which the absorption continua of H2O-CO2, CH4-CO2 and H2-CO2 gas mixture will be characterized by experiment and theory. The postdoctoral researcher will work on theoretical prediction of these continua, which requires modeling of the collision-induced absorptions and of the effect of pressure on the contributions of far line wings. She/he will work under the direct supervision Ha Tran and in collaboration with other researchers working on the continua measurements and modelings, as well as those working on the numerical planetary climate simulations. She/he will develop the codes necessary for the theoretical predictions/calculations of the continua, perform the calculations, analyze the results and compare them with the measurements with the final aim of producing data directly usable for climate predictions.
Specifically, the postdoctoral researcher will perform analysis of absorption/transmission spectra measured by various groups using different laboratory spectrometers (e.g. FTS, CRDS). She/he will develop several theoretical prediction tools adapted for calculations of the continua of CH4-CO2, H2O-CO2 and H2-CO2 mixtures, including the (intrinsic dipole) pressure-broadened band wings and the collision-induced absorption bands. She/he will perform tests of these tools by comparison with measurements and, after optimization of the parameters of the models, systematic calculations of absorption spectra (look-up tables of absorption cross-sections) for the wavelength and temperature ranges relevant for the targeted planetary applications.
The candidate should have a PhD in molecular physics with strong skills in molecular spectroscopy, and inter-molecular collisions dynamics. The knowledge of Fortran and, more generally, of numerical programming will be very helpful.
The postdoctoral researcher will join the ABC(t) team at LMD, one of the world-leading laboratories on the study of collisional effects on molecular spectra but also on planetary climate simulations. She/he will work under the supervision of Ha Tran, in close collaboration with the other researchers involved in the overall project.
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