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H$$_{2}$$ ortho-para conversion on a stepped Pd surface

Ueta, Hirokazu   ; Sasakawa, Yuya*; Ivanov, D.*; Ono, Satoshi*; Ogura, Shohei*; Fukutani, Katsuyuki

We present a direct measurement of fast Ortho-Para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210) at a surface temperature of 50 K. The determined conversion time was about 2 sec, which is in reasonably agreement with a previous theoretical calculation. This agreement supports that ortho-para conversion mechanism of the molecularly chemisorbed H$$_{2}$$ on Pd(210) is the two-step process based on the hyperfine-Coulomb excitation.

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