The Adsorption of 1,3-butadiene on Ag(111): A TPD/IRAS Study and Importance of Lateral Interactions

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2007.01.005· OSTI ID:930290

Hrbek, J; Chang, Z; Hoffman, F

Temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS) have been used to study the adsorption, desorption, molecular orientation and conformation of 1,3-butadiene on Ag(1 1 1) at 80 K. Butadiene adsorbs weakly as an s-trans conformer with the first layer oriented parallel to the silver surface and desorbs without decomposition. A very narrow line shape of the out-of-plane modes at low submonolayer coverage indicates molecular ordering within the diluted adsorbed layer, presumably through weak {pi}-bonding interaction with the surface and intermolecular repulsive interaction. Compression within the first layer at coverages above 0.5 ML is driven by repulsive interaction as seen in both TPD and IRAS data. The IR intensity rollover and peak broadening, together with a significant shift in the TPD peak to lower temperature, indicate a reorientation of the butadiene molecule. Adsorption in the second- and multilayer is characterized by distinct IR frequency shifts and crystal field splitting effects similar to those reported for solid butadiene.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 930290
• Report Number(s): BNL--80994-2008-JA
• Journal Information: Surface Science, Journal Name: Surface Science Journal Issue: 5 Vol. 601; ISSN SUSCAS; ISSN 0039-6028
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ADSORPTION
BUTADIENE
DESORPTION
MOLECULES
ORIENTATION
SILVER
SORPTIVE PROPERTIES
national synchrotron light source