THESE NO 2867 THEULE.rdo
ELECTRIC DIPOLE MOMENTS OF HIGHLY EXCITED MOLECULAR VIBRATIONAL STATES PRÉSENTÉE A LA FACULTÉ SCIENCES DE BASE Institut de chimie moléculaire et biologique SECTION DE CHIMIE ET GÉNIE CHIMIQUE ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE POUR L'OBTENTION DU GRADE DE DOCTEUR ÈS SCIENCES PAR Patrice THEULÉ DEA physique de la matière et du rayonnement, Université Grenoble 1, France ingénieur en physique, école nationale supérieure de physique de Grenoble, et de nationalité française acceptée sur proposition du jury: Prof. Th. Rizzo, directeur de thèse Prof. P. Jensen, rapporteur Prof. F. Merkt, Prof. H. van den Bergh, rapporteur Lausanne, EPFL 2003 Abstract In this work, new spectroscopic techniques have been developed to measure electric dipole moments of highly excited rovibrational states of mal1 polyatomic molecules in the gas phase. These techniques make use of lasers and of microwave synthesizers. They enable one to measure the change on a molecular system caused by applying an external electric field, which is called Stark effect and from this, extract the dipole moment. The first technique, called microwave Stark spectroscopy, makes use of microwave-optical double resonance combined to either laser induced fluorescence or vibrational predissociation detection. The second approach, called Stark quantum beat spectroscopy, relies on the time evolution of a coherently prepared molecular wavepacket in an electric field, using either electronic ...