Low energy electron spectroscopy of Pt (100) and Pt (100)/CO

Netzer, F.P.; Matthew, J.A.D.

doi:10.1016/0039-6028(75)90387-8

Cited by 24 publications

(5 citation statements)

References 28 publications

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“…The adsorption of CO caused an intense loss at 13.2 eV in good agreement with the data obtained on other metals (23,35,36). This may indicate that electron transitions occur within the adsorbed CO between levels which are only little influenced by the metal.…”

Section: Methodssupporting

confidence: 89%

Interaction of HCOOH with a rhodium surface, studied by Auger electron, electron energy loss, and thermal desorption spectroscopy

Solymosi¹

1983

Journal of Catalysis

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The interaction of HCOOH with Rh foil has been investigated by various techniques at low and high temperatures with the primary motivation to determine the stability of formate species on unsupported Rh. The electron energy loss spectrum of Rh foil in the electronic range exhibited losses at 4.1,5.4, 19.6, and 29.5 eV. Adsorption of HCOOH on Rh at 95 K produced new losses at 8.2, 11.3, and 14.2 eV. The intensities of these losses decreased with rise of sample temperature, and new losses developed at 9.5 (O(.,) and 13.2 eV (CO&. On the basis of the behaviour of the above losses, as well as that of the observed decomposition/desorption products of adsorbed HCOOH, it is concluded that (i) HCOOH is adsorbed dissociatively on Rh even at -100 K, producing adsorbed H and formate species, (ii) the surface formate starts to decompose slightly below 200 K yielding HZ, C02, chemisorbed CO, and 0, (iii) the decomposition goes to completion around 300 K, and (iv) the primary products of decomposition of formate species strongly interact with the Rh surface.

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Section: Methodssupporting

confidence: 89%

Interaction of HCOOH with a rhodium surface, studied by Auger electron, electron energy loss, and thermal desorption spectroscopy

Solymosi¹

1983

Journal of Catalysis

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“…The adsorption of CO on Cu(lll) and Ni(ll0) surfaces also gave a loss feature at around 5-6 eV, where neither metal exhibits energy losses. This loss was assigned to a d-2~r* type [27] or to 27r-2~r* charge transfer excitation [24]. On this basis it seems likely that the changes at 5.2 eV during the adsorption of CO and CO: are due to the development of a loss caused by adsorbed species, and not to an intensification of the Rh loss at this energy.…”

Section: Clean Rh(111) Surfacementioning

confidence: 95%

“…This method has so far been used in our laboratory to study the adsorption of HNCO [18], HCOOH [19], CHaOH [20], HCN [21] and C2N 2 [22] on clean and oxgyen-dosed metal surfaces. It proved to be particularly sensitive for determination of the surface decomposition of these compounds by following the development of an intense loss at 13-13.5 eV due to chemisorbed CO. [18,24], Pd [25], Ru [26], Ni [27,28] and Rh [19,20] surfaces, and was assigned to a (lcr/5o)-2~r* type intramolecular electronic excitation.…”

Section: Clean Rh(111) Surfacementioning

confidence: 99%

Impurity effects in the adsorption and dissociation of CO2 on Rh

Solymosi¹,

Kiss²

1985

Surface Science

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The adsorption and dissociation of CO 2 on Rh(111) and Rh foil surfaces have been studied in UHV using Auger electron, electron energy loss (in the electronic range) and thermal desorption spectroscopy. CO 2 adsorbs weakly with a low sticking probability on clean Rh samples at 110 K. The adsorption is accompanied by the appearance of a loss feature at 14 eV. The adsorption of CO 2 took place in two stages, with Tp = 244-233 K (a) and 170 K (fl). Adsorption of 180 L CO 2 at 3×10-7 Torr on clean Rh(lll) at 300 K produced no observable changes in the LEEd, Auger electron, EEL or TD spectra and there was no indication of the dissociation of CO 2 either. Similar results were obtained for a clean Rh foil. However, boron impurity segregated on the surface of Rh exerted a dramatic influence on the adsorptive properties of this surface and caused the dissociation of CO 2 at 270-300 K. This was exhibited by the appearance of an intense loss in the EEL spectrum due to chemisorbed CO, by the buildup of surface oxygen and by the thermal desorption of CO at higher temperatures.

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“…Adsorption of CO under the same conditions yielded a strong loss at 13.0 eV and intensified the Rh loss at 5.2 eV. The 13.0 eV loss due to chemisorbed CO was observed on Cu [23], Pt [18,24], Pd [25], Ru [26], Ni [27,28] and Rh [19,20] surfaces, and was assigned to a (lcr/5o)-2~r* type intramolecular electronic excitation.…”

Section: --Xl ///~ Xlomentioning

confidence: 99%

“…This loss was assigned to a d-2~r* type [27] or to 27r-2~r* charge transfer excitation [24]. On this basis it seems likely that the changes at 5.2 eV during the adsorption of CO and CO: are due to the development of a loss caused by adsorbed species, and not to an intensification of the Rh loss at this energy.…”

Section: --Xl ///~ Xlomentioning

confidence: 99%

Impurity effects in the adsorption and dissociation of CO2 on Rh

Solymosi¹,

Kiss²

1985

Surface Science Letters

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The adsorption and dissociation of CO 2 on Rh(111) and Rh foil surfaces have been studied in UHV using Auger electron, electron energy loss (in the electronic range) and thermal desorption spectroscopy. CO 2 adsorbs weakly with a low sticking probability on clean Rh samples at 110 K. The adsorption is accompanied by the appearance of a loss feature at 14 eV. The adsorption of CO 2 took place in two stages, with Tp = 244-233 K (a) and 170 K (fl). Adsorption of 180 L CO 2 at 3×10 -7 Torr on clean Rh(lll) at 300 K produced no observable changes in the LEEd, Auger electron, EEL or TD spectra and there was no indication of the dissociation of CO 2 either. Similar results were obtained for a clean Rh foil. However, boron impurity segregated on the surface of Rh exerted a dramatic influence on the adsorptive properties of this surface and caused the dissociation of CO 2 at 270-300 K. This was exhibited by the appearance of an intense loss in the EEL spectrum due to chemisorbed CO, by the buildup of surface oxygen and by the thermal desorption of CO at higher temperatures.

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Low energy electron spectroscopy of Pt (100) and Pt (100)/CO

Cited by 24 publications

References 28 publications

Interaction of HCOOH with a rhodium surface, studied by Auger electron, electron energy loss, and thermal desorption spectroscopy

Interaction of HCOOH with a rhodium surface, studied by Auger electron, electron energy loss, and thermal desorption spectroscopy

Impurity effects in the adsorption and dissociation of CO2 on Rh

Impurity effects in the adsorption and dissociation of CO2 on Rh

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