NDLI: THE REACTION OF CO WITH STEPPED METAL SURFACES TOWARDS THE FORMATION OF METAL-SUBCARBONYLS

Content Provider	EDP Sciences
Author	N. KRUSE J.H. BLOCK G. ABEND
Abstract	The interaction of CO with stepped surfaces of transition metal field emitter tips has been studied by means of Pulsed Field Desorption Mass Spectrometry (PFDMS) at temperatures T=300-700 K and pressures below p = 1.3-10-3 Pa. Areas of up to 180 atomic sites on various crystallographic surface planes of each sample were probed. A common feature in the field desorption mass spectra obtained during reaction of CO with Co, Ni, Ru, Rh or Pd is the observation of ions CO+ and Me(CO)xn+ (x = 1 up to 4, n = 1,2). The conclusion is that Mesubcarbonyls are formed in a consecutive reaction involving surface kink sites. In measurements with Fe, subcarbonyls have so far not been observed. Kinetic information about the observed reactions obtained from the dependence of the ion intensities on the desorption field strength, the field free reaction time (10-4 s to 1 s) between the field pulses and the surface temperature suggest Me(CO)x (x≥2) to be mobile surface species. Such mobile carbonyls may produce topographical changes of the surfaces.
Ending Page	C6-254
Starting Page	C6-249
Page Count	6
File Format	HTM / HTML PDF
ISSN	04491947
Alternate Webpage(s)	http://dx.doi.org/10.1051/jphyscol:1988642
Issue Number	C6
Journal	Le Journal de Physique Colloques
Volume Number	49
DOI	10.1051/jphyscol:1988642
Language	English
Publisher	EDP Sciences
Publisher Date	1988-11-01
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Engineering

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THE REACTION OF CO WITH STEPPED METAL SURFACES TOWARDS THE FORMATION OF METAL-SUBCARBONYLS