Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Novelties in Molecular Physics

MO 16.22: Poster

Wednesday, March 25, 2015, 17:00–19:00, C/Foyer

Two color enhanced IRMPD spectroscopy of a homobinuclear silver complex — •Joachim Hewer and Gereon Niedner-Schatteburg — Fachbereich Chemie und Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany

Mass spectrometry and IR spectroscopy in combination enable us to investigate isolated ionic species without interference form solvents, lattices or adsorbates. Utilizing a two laser setup, resonant two color IRMPD (infrared multi photon dissociation) is capable of enhancing fragmentation efficiencies, thus revealing vibrational bands, which may be hardly observable by single color IRMPD.^[1][2] We report studies on a dinuclear transition metal complex [(Ag)₂(HCCA)(DDA)]⁺ (HCCA=α-cyano-4-hydroxycinnamic acid, DDA= 1,3-dideaza-adenine). Structure identification arises from comparison of one- and two-color IRMPD spectra to calculated spectra from density functional theory (DFT). Our investigations elucidate the internal vibrational redistribution (IVR) process as a function of the frequency, intensity and time delay of the applied nanosecond IR pulses. In particular we focused on fragmentation yields as a function of laser intensity.

[1] Y. Nosenko, F. Menges and C. Riehn, G. Niedner-Schatteburg, Phys. Chem. Chem. Phys., 2013, 15, 8171-8178.

[2] J. Lang, M. Gaffga, F. Menges, G. Niedner-Schatteburg, Phys. Chem. Chem. Phys., 2014, 16, 17417.