THE REACTIONS OF SILVER CLUSTERS WITH ETHYLENE AND ETHYLENE-OXIDE - INFRARED AND PHOTOIONIZATION STUDIES OF AGN(C2H4)(M), AG-N(C2H4O)(M) AND THEIR DEUTERATED ANALOGS
Gm. Koretsky et Mb. Knickelbein, THE REACTIONS OF SILVER CLUSTERS WITH ETHYLENE AND ETHYLENE-OXIDE - INFRARED AND PHOTOIONIZATION STUDIES OF AGN(C2H4)(M), AG-N(C2H4O)(M) AND THEIR DEUTERATED ANALOGS, The Journal of chemical physics, 107(24), 1997, pp. 10555-10566
Ethylene and ethylene oxide react readily with silver clusters at 70 K
to form the addition complexes, Ag-n(C2H4), and Ag-n(C2H4O)(m), respe
ctively. The infrared photodissociation spectra of Ag-n(C2H4)(m) and A
g-n(C2D4)(m) (n = 3-7) recorded in the 9-11 mu m region show several c
haracteristic vibrational bands of ethylene lying near their gas phase
frequencies. Photoionization spectroscopy studies reveal that the ion
ization potentials (IPs) of the complexes decrease monotonically with
adsorption of additional ethylene molecules. Together, these results i
mply that as on macroscopic Silver surfaces, ethylene adsorbs molecula
rly to small silver clusters, with a net donation of electron density
into the underlying cluster. Similarly, silver cluster-ethylene oxide
complexes display IPs that decrease with increasing adsorbate coverage
. The infrared depletion spectra of Ag-n(C2D4O)(m) complexes reveal a
single feature at 949 cm(-1), assigned to the nu(4)(a(1)) fundamental
of C2D4O. These results verify that ethylene oxide adsorbs molecularly
to silver clusters, with the oxygen atom oriented toward the silver c
luster. (C) 1997 American Institute of Physics.