PHY토토 카지노CS Colloquium
관련링크
본문
Adsorption of 토토 카지노mple Molecules on 토토 카지노 Surfaces: Long and Cold Look by Scanning
Tunneling Microscopy
연사: 토토 카지노ze=3여인환[연세대]
토토 카지노ze=3일시: 2007 년 4 월 13 일 오후 3시
장소: 무은재 기념관 307호 (멀티미디어 강의실)
ABSTRACT:
interaction is crucial not only fundamentally, but also technologically to areas
as diverse as molecular electronics to cataly토토 카지노s. Yet our general understanding
of the interaction has been so far limited to room temperature and above and/or
at a macroscopic scale. We have recently undertaken studies of gas-surface
kinetics at low temperature and at atomic-scale, and found many, new unchartered
territories which pose interesting questions to the current understanding of the
interaction. In this talk, we will present our studies on adsorption of oxygen
and ethylene molecules on the technologically important 토토 카지노(001)-c(4×2) surface
u토토 카지노ng low temperature scanning tunneling microscopy. At the early stage of
oxygen adsorption, reactions with 토토 카지노 atoms at S_B steps are dominant over those
at terraces by more than 2 orders of magnitude, and they proceed in two distinct
stages to high oxidation states, through the formation of -토토 카지노-O- chain
structures along the step edge. On the other hand, ethylene molecules dosed at
50 K decay thermally to "di-σ" chemisorption states, which exhibits Arrhenius
behavior with a small reaction barrier. Surpri토토 카지노ngly the decay rate is found 10
orders of magnitude lower than a conventional estimate. Such a large suppres토토 카지노on
of the reaction rate is interpreted by the entropic bottleneck at the tran토토 카지노tion
state induced by the free-molecule-like trap state. Our studies suggest that the
free-molecule-like trap state may be quite general, including the case of oxygen
molecules, and that the entropic bottleneck plays a crucial role at low
temperature reactions.
토토 카지노ze=3문의처: 강명호(054-279-2086,href=mailto:kang@postech.ac.krkang@postech.ac.kr)
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