Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
107 (1997), S. 5613-5616
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
A novel reversible order-order phase transition is revealed by reflection absorption infrared spectroscopy and low-energy electron diffraction studies of a chemisorbed monolayer of CO on Co{101¯0} between 100 and 150 K. The high-temperature phase consists of tilted two-fold bridging CO molecules in the well-established p(2×1)g structure, while the low-temperature phase involves the movement of one-third of the CO molecules into three-fold hollow sites to produce a new p(6×1)g structure. The temperature-induced site switching is attributed to a vibrational-entropy- driven second-order displacive phase transition. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.474262
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