Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 51: Molecular Quantum Control
MO 51.3: Talk
Thursday, March 16, 2006, 11:10–11:25, H12
Phase locked Pulse Pairs Spectroscopy on Halogens in solid Ar — •Heide Ibrahim1, Mizuho Fushitani1, Markus Gühr1,2, and Nikolaus Schwentner1 — 1Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin — 2Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025-7015
We used an unbalanced Michelson Interferometer to obtain phase locked pulse pairs (PLPP) for spectroscopy on halogens in rare gas matrices. The chirp difference between the two arms was optimized to match the electronic B state anharmonicity of the molecule. The decaying modulation contrast in the PLPP spectrum indicates a loss of electronic coherence in the range around 1 ps for Cl2 [1] and Br2 in an Ar matrix. From vibrational wavepacket revivals and focussing we determine the vibrational coherence time of Br2 and Cl2 in solid Ar to be 3 ps [1,2]. Comparison with simulations of the PLPP spectrum, taking only into account the B state absorbance, indicates a further contribution in the PLPP spectra, most likely from the lower lying A state continuum. Changing the relative phase of the two pulses allows us to prepare vibrational wavepackets predominantly composed of Zero Phonon Lines (weakly interacting with the matrix) or of Phonon Side Band (strong interaction)and thereby coherently control the molecule-lattice interaction.
[1] M.Fushitani, M.Bargheer, M.Gühr and N.Schwentner, PCCP, 7, 3143 (2005)
[2] M.Gühr, H.Ibrahim and N.Schwentner, PCCP, 6, 5353 (2004)