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Ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

Ueta, Hirokazu  ; Fukutani, Katsuyuki

A unique molecularly chemisorption of H$$_{2}$$ occurs on some stepped surfaces in addition to the typical adsorption schemes of physisorption and dissociation. In the present study, the rotational state and ${it ortho-to-para (o-p)}$ conversion of the molecularly chemisorbed H$$_{2}$$ on Pd(210) at a surface temperature of 50 K were probed by combining a pulsed molecular beam, photo-stimulated desorption and resonance-enhanced multiphoton ionization techniques. We experimentally demonstrated that the ${it (o-p)}$ conversion proceeds with a conversion time constant of $$sim$$2s that is 2-3 orders of magnitude smaller than those reported for physisorption systems. The origins of such fast conversion and the rotational state distribution of H$$_{2}$$ in molecular chemisorption state are discussed.



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