caa a22 4500 60617432X CHVBK 20210128100737.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s11244-015-0408-7 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0408-7 Sticking Probability and Reactivity of Hyperthermal O2 Molecules Impinging on CO Pre-covered Pd(100): Effect of Rotational States with K>1 [Elektronische Daten] [L. Vattuone, L. Savio, F. Pirani, M. Rocca] Collisional alignment in the supersonic expansion of oxygen seeded in lighter carriers allows to produce rotationally aligned beams which were used to study the sticking probability, S, and the reactivity, $$P_{{co_{2} }}$$ P c o 2 , of helicoptering and cartwheeling O2 in the lowest rotational state impinging normally onto Pd(100). Molecules with different rotational alignment are thereby chosen by mechanically selecting either the slow or the fast speed tail of the beam velocity distribution. Here we show for O2 reacting with CO pre-covered Pd(100) that even a moderate increase in the nozzle temperature, TN, with respect to room temperature implies significant changes in both S and $$P_{{co_{2} }}$$ P c o 2 . Since TN affects mainly the rotational state distribution in the formed beam, we conclude that molecules in rotational states with K≥3 behave very differently from those with K=1. Data are presented for both small and intermediate CO pre-coverage. Springer Science+Business Media New York, 2015 Surface science nationallicence Chemisorption nationallicence Molecular beam nationallicence Molecular alignment nationallicence Vattuone L. Dipartimento di Fisica dell'Università di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut Savio L. IMEM-CNR Unità Operativa di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut Pirani F. Dipartimento di Chimica, Biologia e Biotecnologie dell'Università di Perugia, Via Elce di Sotto, 06123, Perugia, Italy aut Rocca M. Dipartimento di Fisica dell'Università di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/10-11(2015-08-01), 580-590 1022-5528 58:10-11<580 2015 58 11244 https://doi.org/10.1007/s11244-015-0408-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0408-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vattuone L. Dipartimento di Fisica dell'Università di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut NATIONALLICENCE 700 1- Savio L. IMEM-CNR Unità Operativa di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut NATIONALLICENCE 700 1- Pirani F. Dipartimento di Chimica, Biologia e Biotecnologie dell'Università di Perugia, Via Elce di Sotto, 06123, Perugia, Italy aut NATIONALLICENCE 700 1- Rocca M. Dipartimento di Fisica dell'Università di Genova, Via Dodecaneso 33, 16146, Genoa, Italy aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/10-11(2015-08-01), 580-590 1022-5528 58:10-11<580 2015 58 11244