Rotational and vibrational dynamics of H2O and HDO in helium nanodroplets

摘要

High-resolution infrared spectra have been obtained in the 2.7 mu m region of water monomer, solvated in superfluid helium nanodroplets. A total of five ro-vibrational transitions have been identified for the nu(3) bands (OH stretch) of H2O and HDO. The associated Lorentzian line widths fall in the range 0.05-2.0 cm(-1) (FWHM). The electric field induced Q(0) transition of HDO has also been observed. In the latter case the broadening appears to be inhomogeneous, with a line width of 0.007 cm(-1). The line widths for the various transitions correlate with the available rotational energy in the excited state, relative to the energies of the elementary excitations of the liquid helium. (c) 2005 Elsevier B.V. All rights reserved.