Spectra of Rg-water dimers in the region of the D2O ν3 asymmetric stretch (Rg = Ar, Kr, Xe)

Spectra of rare gas (Rg) - D2O dimers (Rg = Ar, Kr, Xe) are studied in the region of the D2O nu(3) asymmetric stretch (approximate to 2800 cm(-1)), using a rapid-scan tunable infrared optical parametric oscillator source to probe a pulsed supersonic slit jet expansion. Three bands are observed in each case, labelled according to the D2O rotational transition with which they correlate as: Sigma (1(01)) <-Sigma (0(00)), Pi(1(01)) <- (0(00)), and Sigma(0(00)) <- (1(01)). The Ar-D2O bands exhibit various perturbations and line broadening effects. For Kr-D2O, the Sigma(1(01)) <- Sigma(0(00)) and Sigma(0(00)) <- Sigma(1(01)) bands are simple and relatively unperturbed with almost no resolved Kr isotope structure, while the Sigma (1(01))<- Sigma (0(00)) band is highly perturbed and shows large isotope splittings. This latter perturbation is analyzed in detail with good results. For Xe-D2O, the experimental spectra are unfortunately weaker. Analysis of the Sigma(1(01)) <- Sigma(0(00)) and Sigma (000) <-Sigma (1(01)) bands is again relatively straightforward, but the Sigma(1(01))<- Sigma(0(00)) band is even more perturbed than for Kr-D2O and its analysis proves impossible. Line broadening (for Ar-D2O) and vibrational frequency shift effects are described. [GRAPHICS] .

Automated summary

The spectra of rare gas (Rg) - D2O dimers (Rg = Ar, Kr, Xe) were studied using infrared spectroscopy. Three bands were observed and their perturbations and structures were analyzed.