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Guillaume Jumet

Background

  • BA in chemistry, ULB (2007-2010)
  • MA in chemistry, ULB (2010-2012)
  • Master thesis: Étude théorique de la réaction CH4 + H à la surface de glace de méthane.
  • PhD student in Sciences, ULB, Teaching assistant, (2012-present)

PhD project

Contribution to theoritical study of molecular formations and destructions to ice surfaces
Grain surface chemistry play a crucial role in our understanding of the interstellar medium (ISM). In the ISM, gas-phase reactions were found to be insufficient to explain the observed abundance of small molecules as molecular hydrogen12 but dust grains are accepted to be the favourable environment for collision and reaction of accreted gas phase species.

These dust particules are known to have a core of silicates or amorphous carbon surrounded by mantles of ices consisting, amongst other things, of H2O, CO, CH4 and NH33. The chemistry on the surface of water and CO ices was the subject of a large number of works which is not the case for methane or ammonia ices.

In this project, we focus on the adsorption of H, He, C, N, O, S and P on the surface of homogeneous ammonia and methane ices with crystalline structure. The formation of molecules on surfaces also depends on the nature of the ice and the surface. We thus attach a particular importance to the description of the solid, by evaluating as precisely as possible the interaction potentials between its constituting molecules (methane or ammonia). A study of desorption under the action of UV/visible radiation of these atoms or of the molecules formed on the surfaces such as H2, OH, NH and CH is also considered.
The principal challenge is to establish a methodology allowing a static approach and precise dynamics for molecules of small size adsorbed on the surface of ices represented by a large system and subjected to the action of radiations.

These ices are also present in planetary atmospheres and take part in the photochemical reactions included in the atmospheric models. The description of these processes is also one part of our project.
1. [Gould, R. J., & Salpeter, E. E. (1963). The Interstellar Abundance of the Hydrogen Molecule.I. Basic Processes. The Astrophysical Journal, 138, 393.]
2. [Hollenbach, D., & Salpeter, E. E. (1971). Surface recombination of hydrogen molecules. The Astrophysical Journal, 163, 155.]
3. [Gibb, E. L., Whittet, D. C. B., Schutte, W. 8., Boogert, A. C. A., Chiar, J. E., Ehrenfreund, P., Gerakines, P. a., Keane J. V., Tielens, A. G. G. M., van Dishoeck E. F. & Kerkhof, O. (2000). An inventory of interstellar ices toward the embedded protostar W33A. The Astrophysical Journal, 536(1), 347.]

Publications

Yoca, S. E., Palmeri, P., Quinet, P., Jumet, G. , & Biémont, É. (2012). Radiative properties and core-polarization effects in the W5+ ion. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(3), 035002.

See here.

Teaching Activities

  • Teaching assistant for the course " Chimie: aspects théoriques " (CHIM-G1010), BA1 Médecine, (ULB), 9 ECTS (2012-2014).
  • Teaching assistant for the course " Chimie: aspects pratiques " (CHIM-G1011), BA1 Médecine, (ULB), 3 ECTS (2012-2014).
  • Teaching assistant for the course " Chimie " (CHIM-G1101), BA1 Médecine, (ULB), 10 ECTS (2015-present).
  • Teaching assistant for the course " Biochimie générale + TPs de chimie " (BMOL-G1101), BA1 Médecine, (ULB), 5 ECTS (2015-present).

Contact

Laboratoire de Chimie Quantique et Photophysique (CQP),
Université libre de Bruxelles, CP160/09
50 Av. F.D. Roosevelt, B-1050 Belgium
Phone: +32 (0)2 650 60 22
E-mail


Université Libre de Bruxelles – Faculté des Sciences