ISSI Team: New generation of databases for interstellar chemical modeling in preparation for HSO and ALMA


ALMA Artistic
view
HSO Artistic
view (© ESO)
© ESO - ALMA Division
Goal of the team:
One major question of solar system
history concerns the relation between the chemical complexity observed
in the interstellar medium and the prebiotic molecules in comets and on
Earth during the appearance of life. This question may find some
answers during the next ten years because of two future observational
instruments: the Herschel Space Observatory (HSO) and the Atacama Large
Millimeter Array (ALMA). By giving access to a range of frequencies not
accessible from the ground, HSO will certainly permit the detection of
many new molecules. In addition to finding new molecules because of its
high sensitivity, ALMA will improve our understanding of the conditions
of molecular formation in protostars and protoplanetary disks thanks to
very high spectral and spatial resolution. In order to understand these
future high-quality data, we will need chemical models of much higher
quality than those in use today.
To improve existing models so that we can begin to cope with the large
amounts of high-quality data obtainable from HSO and ALMA, we need to
improve interstellar chemical databases in a variety of ways, but most
importantly in the definition of the precision of reaction rate
coefficients and branching fractions between different pathways so that
accurate uncertainties in the results of models can be determined. To
bring about this desired result, we propose to create a group of about
ten specialists in the complementary fields of experimental chemical
kinetics, ab initio quantum chemical calculations, and the chemical
modeling of interstellar clouds. This group will for the first time
bring expert opinion to bear on the uncertainties of the rate
coefficients contained in the currently existing databases.
Link to the WIKI page (require a password): http://www.obs.u-bordeaux1.fr/ISSI
Team Members
In total, there are 14 participants from 8 countries:
Neutral-neutral reactivity at low temperature:
1 Prof. Ian Smith (University Chemical Laboratory, UK),
2 Jean-Christophe Loison (Laboratoire de Physico-Chimie Moléculaire, France)
Ion-neutral reactions:
3 Prof. Dieter Gerlich (Technische Universitaet Chemnitz, Germany)
Dissociative recombination:
4 Wolf Dietrich Geppert (Stockholm University, Sweden)
Photoreactions:
5 Prof. Ewine van Dishoeck (Leiden Observatory, The Netherlands)
Surface chemistry:
6 Liv Hornekaer (University of Aarhus, Denmark)
Theoretical calculations:
7 Dahbia Talbi (Université de Montpellier, France)
8 Evelyne Roueff (LUTH, France)
9 Prof. Jürgen Troe (University of Göttingen, Germany)
Uncertainty analysis methodology:
10 Pascal Pernot (Laboratoire de Chimie Physique, France)
Chemical modeling and databases:
11 Prof. Tom Millar (Queen’s University Belfast, UK),
12 Prof. Eric Herbst (The Ohio State University, USA)
13 Andrew Markwick-Kemper (University of Manchester, UK)
14 Valentine Wakelam (Laboratoire d’Astrophysique de Bordeaux, France)
Other participants:
Download here
First ISSI meeting: 7 to 10 January 2008
Agenda of the meeting: here
Presentations in pdf format to be downloaded here (require a password)
Agenda before the next meeting in December:
January to February: Selection of the most important reactions (Andrew, Tom, Eric, Evelyne, Pascal and Valentine)
March to October: Research on these reactions (Dahbia, Ewine, Wolf, Dieter, Jürgen, Jean-Christophe and Ian)
October to December: Check the modification in chemical modeling of
these next rate coefficients (Andrew, Tom, Evelyne and Valentine)
February to December: Quantification of the importance of H2 formation
rate coefficient in dense and diffuse clouds - Improvement of H2
formation in models (Liv, Herma, Evelyne and Valentine)
Pictures of the group at the first ISSI meeting can be found here.
Second ISSI meeting: 7 to 10 January 2008
Agenda of the meeting: here
Presentations in pdf format to be downloaded here (require a password)
Pictures of the second ISSI meeting can be found here.