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.

引用

页数：5

共 33 条

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