Mathematics – Probability
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p..85a&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Mathematics
Probability
Scientific paper
We present results of MD calculations performed to study the photodissociation of D2O in an amorphous ice at different ice temperatures in order to investigate isotope effects on the photodesorption processes. In dense interstellar clouds, small dust particles of micrometer silicates are covered by ice mantles, mainly consisting of H2O and also of CO, CO2. Previous MD calculations of H2O ice at Tice=10-90 K show that the photodesorption of H while OH remains trapped is the main outcome in the first three monolayers (MLs). On the other hand, the H and OH photofragments released recombine or are trapped at separate positions in the deeper MLs and can react with other species in the ice. Desorption and trapping probabilities have been calculated following photoexcitation of D2O amorphous ice at 10, 20, 60 and 90 K, and the main conclusions agree with previous calculations of H2O ice. But, the average D photodesorption probability is smaller than that of the H atom, whereas the average OD radical photodesorption probability is larger than that of OH, and the average D2O photodesorption probability is larger than that for H2O due to the D2O kick-out mechanism. The total (OD + D2O) yield has been compared with experiments and the total (OH + H2O) yield from previous simulations. We find better agreement when we compare experimental yields with calculated yields for D2O ice than when we compare with calculated yields for H2O ice.
Andersson Sebastian
Arasa C.
Cuppen Herma
Kroes Geert-Jan
van Dishoeck Ewine F.
No associations
LandOfFree
Molecular dynamics simulations of D2O ice photodesorption does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Molecular dynamics simulations of D2O ice photodesorption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular dynamics simulations of D2O ice photodesorption will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-929120