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MO: Fachverband Molekülphysik

MO 9: Kalte Moleküle II (gemeinsam mit Q)

MO 9.6: 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 Reinhardt^1,3, 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.