TY - JOUR
T1 - Size dependent reaction kinetics of small gold clusters with carbon monoxide
T2 - Influence of internal degrees of freedom and carbonyl complex stability
AU - Hagen, J.
AU - Socaciu, L. D.
AU - Heiz, U.
AU - Bernhardt, T. M.
AU - Wöste, L.
PY - 2003
Y1 - 2003
N2 - The reactions of free gold clusters Au-, Au2 -, and Au3- with carbon monoxide are studied in an rf-octopole ion trap experiment at cryogenic temperatures. While Au - is unreactive toward CO over the whole temperature range investigated, the two and three atom cluster anions show a maximum adsorption of two CO molecules at temperatures below 250 K. From time resolved trapping experiments the strongly cluster size dependent reaction kinetics are obtained and a distinct reaction mechanism is deduced. The size dependence of the measured rate coefficients reveals the preferred formation and particular stability of the carbonyl complex Au3(CO)2-. Through RRK analysis of the absolute termolecular rate coefficients we are able to estimate the binding energy of CO to Au2- and Au 3-.
AB - The reactions of free gold clusters Au-, Au2 -, and Au3- with carbon monoxide are studied in an rf-octopole ion trap experiment at cryogenic temperatures. While Au - is unreactive toward CO over the whole temperature range investigated, the two and three atom cluster anions show a maximum adsorption of two CO molecules at temperatures below 250 K. From time resolved trapping experiments the strongly cluster size dependent reaction kinetics are obtained and a distinct reaction mechanism is deduced. The size dependence of the measured rate coefficients reveals the preferred formation and particular stability of the carbonyl complex Au3(CO)2-. Through RRK analysis of the absolute termolecular rate coefficients we are able to estimate the binding energy of CO to Au2- and Au 3-.
UR - http://www.scopus.com/inward/record.url?scp=0042572423&partnerID=8YFLogxK
U2 - 10.1140/epjd/e2003-00185-6
DO - 10.1140/epjd/e2003-00185-6
M3 - Article
AN - SCOPUS:0042572423
SN - 1434-6060
VL - 24
SP - 327
EP - 330
JO - European Physical Journal D
JF - European Physical Journal D
IS - 1-3
ER -