Stability and dissociation pathways of doped AunX+ clusters (X=Y,Er,Nb)

Författare och institution:

Klavs Hansen (Institutionen för fysik); Nele Veldeman (-); Ewald Janssens (-); Jorg De Haeck (-); Roger E. Silverans (-); Peter Lievens (-)

Publicerad i:

Faraday Discussion, 138 s. 147

Publikationstyp:

Artikel, refereegranskad vetenskaplig

Publiceringsår:

2008

Språk:

engelska

Sammanfattning (abstract):

Size dependent stabilities, fragmentation pathways and dissociation energies of a series of gas phase cationic doped gold clusters, AunX+ (5 < n < 20; X = Y, Er and Nb), and pure Aun+ clusters were investigated in photofragmentation experiments. Size dependent stability patterns were obtained and the branching between monomer and dimer evaporation was studied. For bare gold, the competing neutral monomer and dimer evaporation channels were found in agreement with earlier studies. For doped clusters, monomer evaporation is the most likely fragmentation channel with the exception of Au18Y+ and Au20Y+ for which gold dimer evaporation is also observed. Relations between the evaporative activation energies and both the experimental abundances and the fragment yield were derived based on unimolecular rate constants. The dissociation energies from this analysis show an odd-even staggering and enhanced stabilities for certain cluster sizes, in agreement with simple electronic shell model predictions.

Ämne (baseras på Högskoleverkets indelning av forskningsämnen):

NATURVETENSKAP ->
Fysik ->
Atom- och molekylfysik och optik
NATURVETENSKAP ->
Fysik ->
Den kondenserade materiens fysik ->
Mesoskopisk fysik
NATURVETENSKAP ->
Fysik ->
Annan fysik ->
Statistisk fysik
NATURVETENSKAP ->
Kemi ->
Fysikalisk kemi ->
Kinetik

Nyckelord:

Stability and dissociation pathways, doped gold clusters

Postens nummer:

68949

Posten skapad:

2008-03-06 15:59

Posten ändrad:

2008-12-12 16:48

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