Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Kalte Moleküle II [gemeinsam mit MO]
Q 12.6: Vortrag
Dienstag, 11. März 2008, 12:15–12:30, 3G
Photoexcitation and photodissociation of H3+ — •Dennis Bing1, Max H. Berg1, Holger Kreckel2, Annemieke Petrignani1, Sascha Reinhardt1,3, Xavier Urbain4, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Columbia University, 550 West 120th Street, New York, NY 10027, USA — 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 4Département de Physique, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium
We present ro-vibrational laser spectroscopy of cold H3+ towards the dissociation limit and photodissociation of vibrationally excited H3+ ions, using two distinct experimental setups. The photoexcitation of H3+ was performed in a 22-pole radiofrequency ion trap, where the ions were cooled down to their lowest rotational states and then ro-vibrationally excited by ∼1 eV (∼5 vibrational quanta), i.e., above the molecule’s barrier to linearity. Transitions of about 11230 - 13330 cm−1 were scanned with a Titanium-Sapphire laser, finding lines with predicted Einstein A-coefficients down to <10−1 s−1. The photodissociation of H3+ was performed in a crossed photon and ion-beam setup using a pulsed frequency-doubled dye laser at 294 nm and H3+ ions from a hot ion source. Both dissociation channels, H2+ + H and H+ + H2, were found and investigated.