TY - GEN
T1 - Static and dynamic charging of thin films at the solid-vacuum interface
T2 - 2012 MRS Fall Meeting
AU - Horowitz, Yonatan
AU - Toker, Gil
AU - Asscher, Micha
PY - 2013
Y1 - 2013
N2 - Charging of amorphous solid water (ASW) films has been characterized using high resolution, low energy positive ions (Ar+) and electrons at 1-50 eV energy range. This system responds to charging as a nano-capacitor and has been studied for its static electric field effect on electron- induced-desorption from top layers and internally trapped molecules within ASW film. In addition we have investigated the role of electron energy on chemical reactivity of trapped methyl chloride molecules as model for outer space surface chemistry. Dynamic charging at inner pores of porous silicon (PSi) has been studied as the origin of highly efficient photo-induced desorption (PID) of adsorbates such as Xe, CO and N2O. Wavelength and laser power dependence suggest that cross sections for PID, 3 orders of magnitude larger than on non-porous surfaces, originate from dynamic charging of nanometer scale tips at inner pores. These have lead to transient negatively charged species that undergo an Antoniewitz-like PID mechanism.
AB - Charging of amorphous solid water (ASW) films has been characterized using high resolution, low energy positive ions (Ar+) and electrons at 1-50 eV energy range. This system responds to charging as a nano-capacitor and has been studied for its static electric field effect on electron- induced-desorption from top layers and internally trapped molecules within ASW film. In addition we have investigated the role of electron energy on chemical reactivity of trapped methyl chloride molecules as model for outer space surface chemistry. Dynamic charging at inner pores of porous silicon (PSi) has been studied as the origin of highly efficient photo-induced desorption (PID) of adsorbates such as Xe, CO and N2O. Wavelength and laser power dependence suggest that cross sections for PID, 3 orders of magnitude larger than on non-porous surfaces, originate from dynamic charging of nanometer scale tips at inner pores. These have lead to transient negatively charged species that undergo an Antoniewitz-like PID mechanism.
UR - http://www.scopus.com/inward/record.url?scp=84899831525&partnerID=8YFLogxK
U2 - 10.1557/opl.2012.1673
DO - 10.1557/opl.2012.1673
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AN - SCOPUS:84899831525
SN - 9781632660886
T3 - Materials Research Society Symposium Proceedings
SP - 23
EP - 28
BT - Electrocatalysis and Interfacial Electrochemistry for Energy Conversion and Storage
PB - Materials Research Society
Y2 - 25 November 2012 through 30 November 2012
ER -