Comparison of reactive nucleation of silver and alkali clusters in the presence of oxygen and water

Bréchignac, C.; Cahuzac, Ph.; Leygnier, J.; Tignères, I.

doi:10.1007/s100530050470

Cited by 3 publications

(3 citation statements)

References 21 publications

(24 reference statements)

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“…The blue solid curve shows the mobility distribution measured at purified conditions with significantly lower water and oxygen levels compared to the non-purified case (ppb levels). Earlier studies have shown that water does not react with silver clusters in the absence of oxygen (Br echignac et al 1999a). As a result, the elimination of most peaks of the cluster mobility distribution can be attributed to etching by O 2 .…”

Section: Effect Of Gas Puritymentioning

confidence: 88%

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Maisser

Barmpounis

Attoui

et al. 2015

Aerosol Science and Technology

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A new method for generating metal clusters in the gas phase is described and characterized in this work. The method is based on material evaporation by spark ablation at atmospheric pressure. The characterization of atomic clusters was done by measuring their electrical mobility. The measured mobilities were compared with values found in literature in order to identify the cluster species. We show that silver clusters consisting from one up to 25 atoms can be produced in helium at atmospheric pressure. In addition, the effect of oxygen concentration on the resulting cluster mobility distribution was investigated. Results show that at higher oxygen level, the mobility distribution is dominated by the abundance of stable clusters (i.e., magic number clusters). This can be attributed to an oxidation etching effect.

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Section: Effect Of Gas Puritymentioning

confidence: 88%

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Maisser

Barmpounis

Attoui

et al. 2015

Aerosol Science and Technology

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“…The vapor of cuprous halides CuCl, CuBr, CuI contains mainly trimers but also tetramers [1][2][3][4], whereas monomers and dimers are roughly equally abundant in the vapors of AgCl, AgBr and AgI [5]. It has also been demonstrated that the trimer is a building block in silver hydroxide clusters [6][7][8]. Another common point is the iono-covalent nature of bonding in both cuprous and silver halides.…”

Section: Introductionmentioning

confidence: 94%

Evidence for trimers evaporation in silver bromide clusters

L'Hermite

Rabilloud

Labastie

et al. 2001

The European Physical Journal D

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Metastable fragmentation channels of free silver bromide clusters (AgnBrp) + are reported. The large majority release a neutral trimer (AgBr)3. This is interpreted in the frame of ab initio DFT calculations with 19-electron pseudopotential on silver atom. The stability, the structural and electronic properties of (AgnBrp) (+) (n = 6, p = n, n − 1) are examined. The structures of the clusters are different from expected in electrostatic models. The 3D transition has not yet happened: the calculated ground state structures of (AgBr)n ≤ 6 clusters are quasi two-dimensional. Our work rationalizes the part of covalence in the Ag-Br interaction and the role of d electrons of silver. The known abundance of trimers in the vapor of silver bromide, but also of other silver and cuprous halides is for the first time explained as an indirect consequence of the covalent interaction between metal ions.PACS. 36.40.Qv Stability and fragmentation of clusters -31.15.Ar Ab initio calculations

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“…Surprisingly, while several studies of water adsorption have been performed on clusters of other transition metals, [35][36][37][38][39] almost none have been carried out on gas-phase gold species. To date, the only studies in the gas phase have concerned the binding of water molecules to the Au 1 monomer cation.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of carbon monoxide on smaller gold-cluster anions in an atmospheric-pressure flow-reactor: temperature and humidity dependence

Wallace

Wyrwas

Leavitt

et al. 2005

Phys. Chem. Chem. Phys.

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In the absence of moisture and at room temperature, the activity and saturation of CO on gold cluster anions, Au(N)-, are known to be highly dependent on the size of the cluster. Small Au(N)- clusters (N = 2,3) showed no adsorption activity, and the saturation CO adsorption values did not increase proportionately to cluster size or area. Here, we report on the effects of water vapor and temperature on the ability of Au(N)- clusters to adsorb CO in a high-pressure, fast-flow reactor. In contrast to all earlier reports, our results using this method show that smaller gold-cluster anions bind single and multiple CO groups at ambient temperature and above. In particular, species previously unseen at room temperature, corresponding to Au2(CO)-, Au3(CO) and Au4(CO)2, have been observed. Apparently, the presence of water vapor facilitates the adsorption of CO on the smaller clusters, possibly by aiding in the release of adsorption energy. As the number of studies concerning gold catalysis has continually increased over the past decade, these results provide important new information on the possible role of moisture in gold catalysis.

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Comparison of reactive nucleation of silver and alkali clusters in the presence of oxygen and water

Cited by 3 publications

References 21 publications

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Evidence for trimers evaporation in silver bromide clusters

Adsorption of carbon monoxide on smaller gold-cluster anions in an atmospheric-pressure flow-reactor: temperature and humidity dependence

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