Dr. I. Kleiner, Directeur de recherche CNRS
Isabelle Kleiner is CNRS Director of Research at the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), at Université Paris-Est Créteil (UPEC) and Université de Paris. She obtained her Ph.D. in Chemical Sciences, from Université Libre de Bruxelles and her Habilitation Doctorate degree from the University Paris Sud. She did her post-doctoral fellowship with Dr. J. T. Hougen at the National Institute for Standards and Technology (NIST, USA). Co-funding member and co-director of the Group of Research (GdR) “SPECMO”, CNRS, France from 2008-2019, she was the President of the scientific Committee for the “Journées de Spectroscopie Moléculaire (JSM)” from 2014-2019.

Main Research Interests:
- Molecular spectroscopy
- Theoretical modelling and spectra analysis
- Vibration-rotation of molecules
- Spectroscopy of large amplitude motions, internal rotation
- Applications to molecules of interest for astrophysics, planetology and biology.
My work focuses on high resolution spectroscopy in the microwave, millimeter or infrared spectral range for molecules exhibiting one or more Large Amplitude Motions (LAM) such as the internal rotation of a methyl -CH3 group or the umbrella motion in ammonia (NH3). I use experimental data and develop theoretical codes and models to obtain very precise information on the structure of molecules or on the positions and intensities of spectral lines. This information can then be used for various applications in the field of astrophysics (leading to the detection of pre-biotic and complex organic molecules in the interstellar medium or of small molecules in planetary atmospheres), atmospheric chemistry (permitting the abundance determination of molecular species) or biological applications (serving as benchmarks for quantum chemical calculations).

Diploma and Awards

-PhD Thesis at the Laboratoire de Chimie Physique, Universite Libre de Bruxelles, Belgium.
-Solvay Awards for the Ph. Thesis.
-Habilitation à diriger les recherches, Universite Paris Sud, France.

Employment History

-PhD Fellow, assistant at Fonds National de la Recherche Scientifique, F.N.R.S, Belgium).
-Post-doctoral fellowship, Guest researcher at the "National Institute for Standards and Technology", (NIST), Gaitherburg, USA.
-Director of Research, Centre national de la recherche Scientifique (CNRS).

Scientific Responsabilities

-Co-Director of the French Group of Research, GdR SPECMO, (2008-2019).
-President of the "Journées de Spectroscopie Moléculaire" (JSM), (2014-2019).
-Management Committee Member of the International Network for a Research and Innovation Staff Exchange (RISE) Marie Curie Action (2020-2024), PI: Dr M-L. Senent (CSIC, Espagne).
-Thematic Leader of the spectroscopy group, Laboratoire LISA, Université UPEC, France (2006-2011).
-Supervisor of 7 PhD theses.


My research is in the field of high resolution spectroscopy (microwave and infrared) of isolated molecules with a double objective:
- understand the structure and internal motions of molecular systems
- bring information to other disciplines at the interface with molecular physics, astrophysics, planet atmospheres and biology.
Two classes of molecules are studied:
1) molecules or complexes containing large amplitude motions like internal rotation of methyl groups (acetaldehyde, acetic acid, acetamide, methyl formate, methyl acetate...) or inversion (NH3). We wrote our home-made codes (BELGI-Cs, BELGI-C1, BELGI-2Tops-Cs, BELGI-hybrid) to calculate energy levels,line frequencies and intensities and to fit microwave, (sub)millimeter, infrared data at experimental accuracy.

2) molecules belonging to the C3v symmetry (NH3, PH3, CH3Br, CH3D). For those molecules we also can calculate and fit their infrared spectral data within experimental accuracy which can then be used to support the analysis of planetary spectra

At LISA, a microwave Molecular-Beam-Fourier Transform Spectrometer (from Pr. W. Stahl, RWTH Aachen) is now set-up and a new microwave group is organised with Dr. L. Nguyen (MdC, UPEC).
Journées de Spectroscopie Moléculaire à Créteil (2019): learn about us !

The Molecular Spectroscopy Days in Créteil (Journées de Spectroscopie Moléculaire)



Last teaching classes:
2016 – Educational responsible – Applications of spectroscopy, Université Paris-Est Créteil (UPEC) et Paris Est Marne-la-Vallée (UPEM), Master PCMA, M1, France.
2016 – Educational responsible – Fundamental in Physics, Université des Sciences et des Technologies de Hanoï (USTH), Vietnam.

Organisation of workshops and mini-symposia

- Co-Organisor, Mini-symposium on Large Amplitude Motions, International Symposium on Molecular Spectroscopy (ISMS), June 2020, Urbana, USA (postponed due to the Cornavirus).
- Co-Organisor, 13nd Edition of the "Journées de Spectroscopie moléculaire", May 2019, Créteil, France.
- Co-Organisor, Mini-symposium on Large Amplitude Motions, International Symposium on Molecular Spectroscopy (ISMS), June 2016, Urbana, USA.
- Co-Organisor, International Worskhop SPECMO-SOLEIL: New experimental and Theoretical developments in molecular spectroscopy. Atmospheric and Astrophysical applications.”, Nov. 2010, Saint-Aubin (France).
- Co-Organisor, Conference “60 Years of Molecules, Motion and Matrix Elements“, in honor of Dr. J. T. Hougen, National Institute for standars and Technology, NIST, Gaitherburg, USA, June 2016.

summer school

Summer schools organised

- Co-Organisor, International workshop, "SPECMO2020", selected by Ecole de Physique des Houches, France (May 2020, postponed in 2022 due to the COVID19).
- Co-Organisor, French-German International Summer School, "SPECMO2014", financed by the French-German University (UFA-DFH), Sept. 2014, Corsica, France.
- Co-Organisor, French-German International Summer School, "BIOSYS2008": The study of Biomimetic Systems", financed by the French-German University (UFA-DFH) and CNRS, Sept. 2008, Fréjus, France.
- Co-Organisor, Thematic School of CNRS,"BIOMIMETIQUE 2005", financed by CNRS, Sept. 2005, Aussois, France.

BIOSYS 2008 (Frejus, France)

SPECMO 2014 (Corsica)


Dr. I. Kleiner, Directeur de recherche CNRS

Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), CNRS UMR 7583, Universites Paris Diderot et Paris Est Street: 61, av. General de Gaulle Zip code: 94010 City: Creteil Country: France

Phone: 00-33-(0)- 8239-2043
Fax: 00-33-(0)- 45 17 1564
Email: isabelle.kleiner@lisa.u-pec.fr