Konstanz 1998 – wissenschaftliches Programm

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MO: Molekülphysik

MO 10: Poster: Spektroskopie, Photodiss., Theorie

MO 10.31: Poster

Mittwoch, 18. März 1998, 16:00–18:00, PF

Selective Infrared Multiphoton Dissociation of Silane — •J. Makowe, O. V. Boiarkine, and T. R. Rizzo — DC-LCPM, EPFL, 1015 Lausanne, Schweiz

An efficient collision free Infrared Multiphoton Dissociation (IR MPD) of SiH₄ molecules has been achieved using a line tunable home-made high power NH₃ laser pumped by a TEA CO₂ laser. This has been used for selective IR MPD of SiH₄ molecules, vibrationally preexcited by a near IR laser to the first SiH stretch overtone level. The near IR laser can be tuned for rotational selective preexcitation of SiH₄ molecules, followed by IR MPD producing SiH₂ fragments. By optimization of energy, fluence and wavelength of the dissociating laser it is possible to achieve high dissociation yield for vibrationally preexcited molecules without significant dissociation of ground state molecules.