Direct measurement of fast ortho-para conversion of molecularly chemisorbed H2 on Pd(210)

被引：3
|
作者：
Ueta, H. [1 ]
Sasakawa, Y. [2 ]
Ivanov, D. [2 ]
Ohno, S. [2 ]
Ogura, S. [2 ]
Fukutani, K. [1 ,2 ]
机构：
[1] Japan Atom Energy Agcy JAEA, Adv Sci Res Ctr, 2-4 Shirakata, Tokai, Ibaraki 3191195, Japan
[2] Univ Tokyo, Inst Ind Sci, Meguro Ku, 4-6-1 Komaba, Tokyo 1538505, Japan
来源：
PHYSICAL REVIEW B | 2020年 / 102卷 / 12期
关键词：
HYDROGEN; ADSORPTION; SURFACE; STATE;
D O I：
10.1103/PhysRevB.102.121407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ortho-para conversion of molecularly chemisorbed H-2 on a Pd(210) surface at a surface temperature of 50 K is reported. A combination of a pulsed molecular beam, photostimulated desorption, and resonance-enhanced multiphoton ionization techniques was used for probing the change in the rotational states of molecularly chemisorbed H-2 on the surface. Our result shows that fast ortho-para conversion of chemisorbed H-2 occurs. The conversion time was experimentally determined to be about 2 s, which is in good agreement with a previous theoretical calculation. This agreement supports that the ortho-para conversion mechanism of the molecularly chemisorbed H-2 on Pd(210) is a two-step process based on the hyperfine-Coulomb excitation.
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页数：5
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