Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 16: Posters 3: Novelties in Molecular Physics
MO 16.18: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
IR spectroscopy of the ν2 band of the water monomer solvated in helium droplets — •Raffael Schwan, Theo Fischer, Gerhard Schwaab, and Martina Havenith — Ruhr-University Bochum, 44801 Bochum, Germany
High-resolution infrared spectra have been obtained in the frequency range of the ν2 band of water solvated in superfluid helium droplets. Helium droplets provide an ultracold matrix at a temperature of 0.37 K. At this temperature only vibrational and rotational ground states of solvated molecules are populated. The spectra of water in helium droplets contain transitions from the rotational states 000 and 101 of the vibrational ground state since these states belong to different nuclear spin symmetry species. Due to slow nuclear spin relaxation in helium droplets a population ratio of about 1:3 is expected. For the water monomer a total of three bands has been found for the HOH ν2 bending mode between 1600 and 1700 cm−1. The bands were assigned to the three energetically lowest ro-vibrational transitions ν2[110← 101], ν2[111← 000] and ν2[212← 101]. Rotational constants and rotational relaxation times can be estimated for the ro-vibrational transitions of the ν2 bending mode analogous to previous results for the ν1 and ν3 stretching modes in helium droplets [1,2].
[1] K.E. Kuyanov, M.N. Slipchenko, A.F. Vilesov, Chem. Phys. Lett. 427 (2006) 5-9.
[2] C.M. Lindsay, G.E. Douberly, R.E. Miller, J. Mol. Struct. 786 (2006) 96-104.