banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The sticking probability of D2O-water on ice: Isotope effects and the influence of vibrational excitation
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

Panel (a): Calculated fractional population of the five lowest rotational levels of D2O as function of rotational temperature. Close to Trot = 0 K, only the lowest rotational state of each of the two nuclear spin isomers (ortho and para) is populated in a 2:1 ortho:para ratio. Panel (b): Pyroelectric detector signal as function of excitation laser power monitoring the initial population of specific JKaKc-levels in a 1% D2O in He expansion for TN = 373 K. Each asymptote A of the power dependences (obtained from a fit of y = A(1-e−k(x-xc)) to the data) represents the population in the initial level of the indicated transition. Comparison of the two graphs yields a maximal excited fraction of 30% for the R11(1) transition.

Image of FIG. 2.
FIG. 2.

D2O partial pressure changes in UHV chamber when a H2O or D2O ice surface is exposed to a D2O molecular beam (Et = 69 kJ/mol, θ = 60°, Ts = 108 K) in comparison to D2O scattering from an inert PTFE beam flag. Initially, when the D2O beam strikes with H2O surface, a larger pressure rise is detected (see insert) than for the three subsequent exposures when the ice surface is covered with D2O-ice. For the final exposure, the D2O beam is scattered off an inert flag (0% sticking) instead off the ice surface.

Image of FIG. 3.
FIG. 3.

Ground state sticking probabilities of D2O on H2O- and D2O-ice as function of incident angle for Et = 38 kJ/mol and 69 kJ/mol. The D2O sticking probability decreases with increasing speed parallel to the surface. D2O trapping on H2O-ice is slightly (1%) lower than on D2O-ice. The error-bars indicate the standard deviation of at least three independent measurements.

Image of FIG. 4.
FIG. 4.

D2O partial pressure rise during scattering of a D2O molecular beam (Et = 38 kJ/mol, normal incidence) from the D2O ice-covered surface (Ts = 108 K). Less than 1% of the incident D2O molecules are reflected. IR pumping of the antisymmetric OD-stretch normal mode of 25% of the incident molecules produces no detectable change in D2O partial pressure (red line indicates laser on/off).


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The sticking probability of D2O-water on ice: Isotope effects and the influence of vibrational excitation