2004
DOI: 10.1002/ange.200461302
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Stereodynamic Effects in the Adsorption of Ethylene onto a Metal Surface

Abstract: The role of molecular alignment of nonpolar molecules in gas-surface interactions has so far escaped direct experimental investigations. We have employed a novel technique to prepare highly aligned supersonic beams and we show that ethylene molecules that impinge on silver surfaces precovered with molecular oxygen as "helicopters" have a higher sticking probability than "cartwheels" (Figure 1). The sticking probability, S, of reactant gas-phase molecules impinging on a metal surface is a key parameter for the … Show more

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Cited by 7 publications
(11 citation statements)
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“…The entrance could be found by shooting them directly in exploiting the directionality of a supersonic molecular beam in which the molecules are carried by an inert gas. As recently shown, symmetric tops can be aligned with respect to the rotational axis, increasing significantly the probability of entering with the molecular axis oriented upon purpose, either along or from the top, perpendicularly to the nanotunnel axis535455.…”
Section: Discussionmentioning
confidence: 94%
“…The entrance could be found by shooting them directly in exploiting the directionality of a supersonic molecular beam in which the molecules are carried by an inert gas. As recently shown, symmetric tops can be aligned with respect to the rotational axis, increasing significantly the probability of entering with the molecular axis oriented upon purpose, either along or from the top, perpendicularly to the nanotunnel axis535455.…”
Section: Discussionmentioning
confidence: 94%
“…Less attention has been devoted to rotations because they involve less energy, [8] and are therefore important only for physisorption. [9,10] We show here that rotations as well as the alignment of the rotational axis play a role in the dissociative chemisorption of O 2 onto a COÀ Pd(100) surface. The effect, which arises from the requirements needed to pass through the CO adlayer, leads to different sticking probabilities and average O À CO distances, and has possible general applications for controlling reactions and film growth.…”
mentioning
confidence: 96%
“…Vibrational excitations and conversion of translational to vibrational energy were thereby found to account for strong enhancements in the dissociation probability. Less attention has been devoted to rotations because they involve less energy,8 and are therefore important only for physisorption 9. 10 We show here that rotations as well as the alignment of the rotational axis play a role in the dissociative chemisorption of O 2 onto a COPd(100) surface.…”
mentioning
confidence: 77%
“…The alignment of rotational angular momentum can be exploited to investigate stereodynamical effects in molecular adsorption processes 9. 1113 Such an alignment, which consists of a propensity of molecules to populate specific helicity states (defined by the quantum number M , the projection of the rotational angular momentum along the propagation direction) can be naturally induced by collisions in seeded supersonic molecular beams (MBs).…”
mentioning
confidence: 99%
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