研究・研究者
研究会・セミナー
| 日 時 | 2007年04月23日(月) 15:30 |
|---|---|
| 場 所 | 分子科学研究所 研究棟2階 201セミナー室 |
| 概 要 | ストックホルム大学 Richard D. Thomas博士， Vitali Zhaunerchyk氏によるオープンセミナーを行います。イオン蓄積リングを用いた超低速電子との解離性再結合過程に関する最先端の研究成果についてご講演いただく予定です。皆様の御参加をお待ちしております。
Speaker 1: Mr. Vitali Zhaunerchyk (Stockholm Univ.) Abstract:Dissociative recombination of molecular hydrogen ions with slow electrons for collision energies between 0 and 400 meV have been studied. By employing a pulsed expansion source for rotational cooling and by exploiting super-elastic collisions with near-zero eV electrons inside a heavy ion storage ring for vibrational cooling, we observe a highly structured DR cross section, comparable to HD+. Using para-hydrogen enriched ion beams, we identify features in the DR cross sections attributed to v=0, J=even molecules (para- H2) and v=0, J=odd (ortho-H2) molecules, separately. Indications are given that para-levels have different DR rate coefficients from ortho-levels for the first four vibrational levels at near 0 eV collisions.
Speaker 2: Dr. Richard D. Thomas (Stockholm Univ.) Abstract: The interaction of matter with its environment is the driving force behind the evolution of 99% of the observed matter in the universe. The majority of the visible universe exists in a state of weak ionisation, the so called fourth state of matter: plasma. Plasmas are ubiquitous, from those occurring naturally; interstellar molecular clouds, cometary comae, circumstellar shells, to those which are anthropic in origin; flames, combustion engines and fusion reactors. The evolution of these plasmas is driven by the interaction of the plasma constituents; the ions and the electrons. One of the most important subsets of these reactions is electron- molecular ion recombination. The rate at which the electron reacts with the ion depends on many parameters, for examples the collision energy, the internal energy of the ion, and the structure of the ion itself. Measuring these properties together with the manner in which the system breaks up is therefore critical if the evolution of the environment is to be understood at all. Several techniques have been developed to study just such reactions to obtain the necessary information on the parameters. In this talk the focus will be on one the most recently developed of these techniques, the Ion Storage Ring, together with the detection tools and techniques used to extract the necessary information from the reaction. |
| お問合せ先 | 菱川明栄（光分子科学研究領域） |
