AD-A174 01l X-RAY ABSORPTION SPECTROSCOPY OF GAS PHASE METALCLUSTERS(U) BOEING AEROSPACE CO SEATTLE WAE C MARQUES ET AL 31 OCT 86 TR-3 NB8OO4-85-C-82B7

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ONR Technical Report #3

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Boeing Aerospace Compa y (It applicuble)

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Box 3999Seattle, WA 98124

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Spectroscopv of Gas Phase Metal Clusters12. PERSONAL AUTHOR(S)

ard C. arques, Darin S. Olson, Donald R. Sandstrom, Farrel W. Lytle, Robert B. Greegoi

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Technical FROM Sept '86ToAUg '87 10-31-86 910. SUPPLEMENTARY NOTATION

Abstract of poster presentation submitted to 13th Annual SSRL User's Conference.

17. COSATI CODES -1. UJACT TERMS (Continua an revere if ncehbery ad idenlfy by block number)

FIELD GROUP SUB. GR. -ray absorption spectroscopy, gas phase, metal clusters,evaporation sourqe, electron yield detection, transitionmetal coordination chemistry, supported metal catalysis

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Technical Report No. 3

X-RAY ABSORPTION SPECTROSCOPY OF GAS PHASE METAL CLUSTERS

by

Edward C. Marques, Darin S. Olson, Donald R. Sandstrom,Farrel W. Lytle and Robert B. Greegor

Boeing Aerospace CompanySeattle, Wshington 98124

published in

Proceedings of the 13th Annual User's ConferenceStanford Synchrotron Radiation Laboratory

October 1986

Reproduction in whole or in part is permitted forany purpose of the United States Government

*This document has been approved for public release and sale;its distribution is unlimited.

86 11 12 082

X-RAY ABSORPTION SPECTROSCOPY OF GAS PHASE METAL CLUSTERS

Edward C. Marques, Dari n S. Olson, Donald R. Sandstrom,Farrel W. Lytle, and Robert B. Greegor

- Boeing Aerospace CompanyKP , j,- B 3999, Seattle, WA 98124

Catalysis' and trans ion-11- coordination chemistry, speci ally metal-halideligand format' are long standing research interests of ours. An er active topicof applie search, to which we have recently become associated, is Lhe productionand co t I of vapor phase metal clusters in sizes ranging from one 5 thousands ofator n' e 5 . hc eftabilished it glectron yield detection has a very highsensitivity to species in the gas phase Tfhese events suggested the possibility of acombined experiment; in-situ x-ray absorption study of evaporated metal in gasphase. The comparison of gas phase results to earlier work on supported metalcatalysis would be very helpful in determining the extent of support interaction. Inaddition, new information gathered from experiments where gas phase metalatoms or clusters are reacted with molecules, such as I-!No, Cl NH etc., wouldimprove our understanding of transition metal coordination chemisiry.

Trial experiments were completed at SSRL using a preliminary design for the metalvapor cell/detector. A resistance heated evaporation source was positioned so thatmetal vapor (in this case Cu) would flow directly through the electron detectiongrids, while the x-ray beam crossed through the vapor between the grids. -Qt'T1,results suggested some improvements to the evaporator design which would resultin better electrical isolation and less contamination of insulators. The newer designwill also have better vacuum pumping characteristics and a longer path for x-raysthrough the vapor

The research of Mar ues, Olson and Sandstrom was supported by the Office ofNaval Research. Lytle and Greegor were supported by the National ScienceFoundation.

References:

1. F.W. Lytle, G.H. Via and J.H. Sinfelt, "X-ray Absorption Spectroscopy: CatalystApplications" in Synchrotron Radiation Research, eds. H.Winick and S. Doniach,(Plenum Press, New York, 1980), p. 401.

2. D.R. Sandstrom, "EXAFS Studies of Electrolyte Solutions" in EXAFS and Near EdgeStructure III, eds. K. Hodgson, B. Hedman and J. Penner-Hahn, (Springer Verlag,Berlin 1984), p. 409 .

3. T. Takagi, I. Yamada and A. Sasaki, J. Vac. Sci. Technol. 12, 1128(1975).

4. F.W. Lytle and R.B. Greegor, "Gas Phase X-ray Absorption Spectroscopy With An UElectron Yield Detector", presented at lVth Int. EXAFS Conf., Abbaye Royale de ElFontevraud, France, July 1986. To be published in Les Editions de Physique.

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