2009
DOI: 10.1039/b817380j
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Energy-pooling transitions to doubly excited K atoms at a promoted iron-oxide catalyst surface: more than 30 eV available for reaction

Abstract: The promoter action of alkali atoms, such as K atoms, at heterogeneous catalyst surfaces has been used in industrial catalysis for many decades, giving improved activity and selectivity in the catalyzed chemical reactions. Several mechanisms for this promotion effect have been proposed, among which the Rydberg excitation mechanism is well-supported by experiments from our groups. Further experiments now show that even doubly excited K Rydberg species are formed at an industrial catalyst (styrene catalyst) surf… Show more

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Cited by 17 publications
(23 citation statements)
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“…On the emitter, D(RM) will be formed initially in excitation levels D(3) and D(4) by interaction with the K promoter atoms in analogy with H(RM), as shown in previous studies [1,32]. The material will easily fall down to lower excitation levels like D(1) and D(−1), as observed on non-magnetic surfaces and in Figs.…”
Section: Probing On a Foil Above The Magnetmentioning
confidence: 78%
“…On the emitter, D(RM) will be formed initially in excitation levels D(3) and D(4) by interaction with the K promoter atoms in analogy with H(RM), as shown in previous studies [1,32]. The material will easily fall down to lower excitation levels like D(1) and D(−1), as observed on non-magnetic surfaces and in Figs.…”
Section: Probing On a Foil Above The Magnetmentioning
confidence: 78%
“…Due to the stimulated emission mechanism, averaging is Note the typical magic numbers for the H N clusters. The temperature of the clusters before CE is down to 2 K. Modified from [12] preferred to obtain good spectra. It should be noted that electric fields easily give large Stark splitting, and that the most convenient, probably highly coherent signal source is a surface where the RM clusters form a layer or cloud.…”
Section: Rotational Spectroscopymentioning
confidence: 99%
“…The atom-level description of the catalyst action and of the RM formation at such catalyst surfaces is outside the scope of the present review. Much information already exists in this field [12].…”
Section: Introductionmentioning
confidence: 99%
“…Without such destruction, the emitter is stable and can be operated in the experiments for many months, while the content of K atoms is slowly lost, finally giving an exhausted non-working catalyst composed of dense iron and iron oxide. Descriptions of its operation and general catalytic properties were recently published [1,35]. The emitter can be moved perpendicularly to the laser beam in an UHV chamber with base pressure of 2 9 10 -8 mbar.…”
Section: Methodsmentioning
confidence: 99%