Thermal and photoinduced dissociation of C2H5I to yield C2H5 on a Pd(100) surface

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Abstract

The surface chemistry of ethyl iodide over a Pd(100) surface has been studied at 90-450 K with the aim of generating C2H5 species. The methods used included Auger electron spectroscopy (AES), photoelectron spectroscopy (XPS and UPS), temperature-programmed desorption (TPD), and work function measurements. Ethyl iodide adsorbs molecularly on a Pd(100) surface at 90 K, and this adsorption is followed by a multilayer formation at high exposures. Adsorption of C2H5I is characterized by a work function decrease (2.00 eV at monolayer), indicating that adsorbed C2H5I has a large, positive outward dipole moment. The thermal dissociation of adsorbed C2H5I occurs only around 160-170 K. Illumination of the adsorbed layer induced the dissociation even at 90-95 K. The primary products of dissociation, C2H5 and I, were characterized by a C(1s) binding energy of 284.1 eV and by an I(3d5/2) binding energy of 619.7 eV. The C2H5 reacted to form C2H4 and C2H6 at 160-230 K. A fraction of the ethylene (Π-bonded form) desorbs, and another fraction (di-σ-form) is transformed into a vinyl species, which decomposes only above 450 K.

Original languageEnglish
Pages (from-to)11056-11063
Number of pages8
JournalJournal of Physical Chemistry
Volume97
Issue number42
Publication statusPublished - 1993

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thermal dissociation
Iodides
dissociation
Binding energy
iodides
binding energy
Adsorption
adsorption
Dipole moment
Auger electron spectroscopy
Temperature programmed desorption
Photoelectron spectroscopy
Surface chemistry
Auger spectroscopy
electron spectroscopy
Monolayers
Ethylene
Multilayers
dipole moments
ethylene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Thermal and photoinduced dissociation of C2H5I to yield C2H5 on a Pd(100) surface. / Kovács, I.; Solymosi, F.

In: Journal of Physical Chemistry, Vol. 97, No. 42, 1993, p. 11056-11063.

Research output: Contribution to journalArticle

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N2 - The surface chemistry of ethyl iodide over a Pd(100) surface has been studied at 90-450 K with the aim of generating C2H5 species. The methods used included Auger electron spectroscopy (AES), photoelectron spectroscopy (XPS and UPS), temperature-programmed desorption (TPD), and work function measurements. Ethyl iodide adsorbs molecularly on a Pd(100) surface at 90 K, and this adsorption is followed by a multilayer formation at high exposures. Adsorption of C2H5I is characterized by a work function decrease (2.00 eV at monolayer), indicating that adsorbed C2H5I has a large, positive outward dipole moment. The thermal dissociation of adsorbed C2H5I occurs only around 160-170 K. Illumination of the adsorbed layer induced the dissociation even at 90-95 K. The primary products of dissociation, C2H5 and I, were characterized by a C(1s) binding energy of 284.1 eV and by an I(3d5/2) binding energy of 619.7 eV. The C2H5 reacted to form C2H4 and C2H6 at 160-230 K. A fraction of the ethylene (Π-bonded form) desorbs, and another fraction (di-σ-form) is transformed into a vinyl species, which decomposes only above 450 K.

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