title: High-resolution spectroscopy of matrix-isolated ReO4-molecules.
abstract: The temperature-dependent linewidth of the saturable infrared active nu(3) vibrational mode (10.8 microm) of ReO(4)(-) molecules in pure-KI host crystals has been measured between 2 and 600 K. Below 20 K the absorption line is inhomogeneously broadened and has a 0.016-cm(-1) width (FWHM). Above 30 K the transition is homogeneously broadened by elastic acoustic phonon-scattering processes. The low-temperature inhomogeneous width of ReO(4)(-) molecules in KI:RbI alloys is 2 orders of magnitude larger than for the pure KI crystal, and the absorption is coincident with the 10.8-microm P(42) CO(2) laser line at all temperatures.
authors.affiliation: Physics Department, General Motors Research Laboratories, Warren, Michigan 48090, USA.
authors.forename: A R
authors.initials: AR
authors.lastname: Chraplyvy
authors.forename: W E
authors.initials: WE
authors.lastname: Moerner
authors.forename: A J
authors.initials: AJ
authors.lastname: Sievers