Measurement of the adsorption energy difference between ortho- and para-D2 on an amorphous solid water ice surface

Details Measurement of the adsorption energy difference between ortho- and para-D2 on an amorphous solid water ice surface Measurement of the adsorption energy difference between ortho- and para-D2 on an amorphous solid water ice surface

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..78m&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

Laboratory

Scientific paper

Molecular hydrogen interaction on water ice surfaces is a major process taking place in the interstellar dense clouds. To study the effect of the rotation of D2 on adsorption on amorphous solid water ice surfaces we combined a laser ionization with a classical Thermal Desorption Spectroscopy (TDS). The D2 molecules can be devided into two different kinds of populations depending on the nuclear spin orientation of their two constituent atoms. We have ortho-D2 for even rotational J numbers and para-D2 for odd rotational J numbers. We noticed that the desorption profiles of the ortho- and para-D2 are different. This difference is due to a shift in the adsorption energy distribution of the two lowest rotational states. Molecules in J=1 are more strongly bound to the ice surface than those in J=0. This energy difference is estimated to be 1.4 +/- 0.3 meV, and it is in agreement with previous calculations and interpretations.

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