title: Infrared emission spectra and equilibrium bond lengths of gaseous ZnH2 and ZnD2.
abstract: A detailed analysis of the high resolution infrared emission spectra of gaseous ZnH2 and ZnD2 in the 800-2200 cm(-1) spectral range is presented. The nu3 antisymmetric stretching fundamental bands of 64ZnH2, 66ZnH2, 67ZnH2, 68ZnH2, 64ZnD2, 66ZnD2 and 68ZnD2, as well as several hot bands involving nu1, nu2 and nu3 were rotationally analyzed, and spectroscopic constants were obtained. Rotational l-type doubling and l-type resonance, local perturbations, and Fermi resonances were observed in the vibration-rotation bands of both ZnH2 and ZnD2, and equilibrium vibrational frequencies (omega1, omega2 and omega3) were estimated. Using the rotational constants of the 000, 100, 01(1)0 and 001 vibrational levels, the equilibrium rotational constants (B(e)) of 64ZnH2 and 64ZnD2 were determined to be 3.600 269(31) cm(-1) and 1.801 985(25) cm(-1), respectively, and the associated equilibrium bond lengths (r(e)) are 1.524 13(1) angstroms and 1.523 94(1) angstroms, respectively. The difference between the r(e) values of 64ZnH2 and 64ZnD2 is about 0.01%, and is mainly due to the breakdown of the Born-Oppenheimer approximation.
authors.affiliation: Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON, CanadaN2L 3G1.
authors.forename: Alireza
authors.initials: A
authors.lastname: Shayesteh
authors.forename: Iouli E
authors.initials: IE
authors.lastname: Gordon
authors.forename: Dominique R T
authors.initials: DR
authors.lastname: Appadoo
authors.forename: Peter F
authors.initials: PF
authors.lastname: Bernath