A novel experimental method for the measurement of the caloric curves of clusters

A novel experimental scheme has been developed in order to measure the heat capacity of mass selected clusters. It is based on controlled sticking of atoms on clusters. This allows one to construct the caloric curve, thus determining the melting temperature and the latent heat of fusion in the case of first-order phase transitions. This method is model-free. It is transferable to many systems since the energy is brought to clusters through sticking collisions. As an example, it has been applied to Na\_90\^+ and Na\_140\^+. Our results are in good agreement with previous measurements

Experimental Determination of Nucleation Scaling Law for Small Charged Particles

We investigated the nucleation process at the molecular level. Controlled sticking of individual atoms onto mass selected clusters over a wide mass range has been carried out for the first time. We measured the absolute unimolecular nucleation cross sections of cationic sodium clusters Na_{n}^{+} in the range n=25-200 at several collision energies. The widely used hard sphere approximation clearly fails for small sizes: not only should vapor-to-liquid nucleation theories be modified, but also, through the microreversibility principle, cluster decay rate statistical models

Fizeau et l’entraÎnement partiel de l’éther

Entre 1849 et 1851, Hippolyte Fizeau a réalisé successivement trois expériences fondamentales relatives à la vitesse de la lumière. Ce sont toutes trois de véritables tours de force expérimentaux qui ont eu des conséquences majeures dans l’évolution de nos conceptions de la lumière et, comme l’a attesté Albert Einstein lui-même, dans l’avènement de la relativité restreinte. Nous présentons à la fois le contexte et les conséquences historiques ainsi que la réplique moderne que nous avons réalisée de l’expérience de 1851 dite « d’entraînement partiel de l’éther »

Processus élémentaires de nucléation (un outil pour l'étude des transitions de phases dans les agrégats)

TOULOUSE3-BU Sciences (315552104) / SudocSudocFranceF