Mathematics – Probability
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sursc.593..202y&link_type=abstract
Surface Science, Volume 593, Issue 1-3, p. 202-209.
Mathematics
Probability
6
Scientific paper
We present recent results in an investigation of source mechanisms for the origin of alkali atoms (Na, K) in tenuous planetary atmospheres. A reversible temperature dependence has recently been observed in the electron and photon stimulated desorption (ESD and PSD) of Na from a lunar basalt sample. The observations were attributed to a temperature-related variations in binding sites with different desorption rates. We have now measured the reversible temperature-dependence of the ESD yields for neutral Na and K, and ionic Na+ and K+ from an SiO2 surface. The neutral desorption yields demonstrate opposite behavior from the lunar sample, which is presumably associated with different desorption mechanisms. The sticking probability S for atomic K is nearly constant over the substrate temperature range 100 500 K, whereas S for Na decreases with increasing T in this range. To clarify the charge-transfer desorption mechanism, we compare the DIET of monovalent atoms (Na, K) and divalent atoms (Ba). The threshold for ESD of Ba is ˜25 eV, much higher than that for Na, K (3 and 4 eV).
Madey Theodore E.
Yakshinskiy Boris V.
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