特集「2020年日本表面真空学会学術講演会特集号Ⅲ」
Pd(210)表面に化学吸着したH2オルト–パラ転換
2021 年 64 巻 9 号 p. 430-434
詳細
2021 年 64 巻 9 号 p. 430-434
A unique molecularly chemisorption of H2 occurs on some stepped surfaces in addition to the typical adsorption schemes of physisorption and dissociation. In the present study, the rotational state and ortho-to-para (o-p) conversion of the molecularly chemisorbed H2 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 o-p conversion proceeds with a conversion time constant of ～2 s 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 H2 in molecular chemisorption state are discussed.
