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 50 条

[1] Rotational state modification and fast ortho-para conversion of H2 trapped within the highly anisotropic potential of Pd(210)
Ohno, S.
Ivanov, D.
Ogura, S.
Wilde, M.
Arguelles, E. F.
Dino, W. A.
Kasai, H.
Fukutani, K.
PHYSICAL REVIEW B, 2018, 97 (08)
[2] Ortho-para conversion of interstitial H2 in Si
Hiller, M.
Lavrov, E. V.
Weber, J.
PHYSICAL REVIEW LETTERS, 2007, 98 (05)
[3] Ortho-para conversion of H2 in crystalline silicon
Herman, Roger M.
Suarez, Alejandro
Sofo, Jorge
Lewis, John Courtenay
20TH INTERNATIONAL CONFERENCE ON SPECTRAL LINE SHAPES, 2010, 1290 : 284 - +
[4] Fast ortho-para conversion of H2 adsorbed at copper surface step atoms
Svensson, K.
Andersson, S.
PHYSICAL REVIEW LETTERS, 2007, 98 (09)
[5] H2 adsorption and ortho-para conversion on ETS-10
Vitillo, J. G.
Cocina, D.
Gribov, E. N.
Ricchiardi, G.
Zecchina, A.
Spoto, G.
FROM ZEOLITES TO POROUS MOF MATERIALS: THE 40TH ANNIVERSARY OF INTERNATIONAL ZEOLITE CONFERENCE, PROCEEDINGS OF THE 15TH INTERNATIONAL ZEOLITE CONFERENCE, 2007, 170 : 893 - 901
[6] Efficient ortho-para conversion of H2 on interstellar grain surfaces
Bron, Emeric
Le Petit, Franck
Le Bourlot, Jacques
Astronomy and Astrophysics, 2016, 588
[7] H2 Ortho-Para Spin Conversion on Inhomogeneous Grain Surfaces
Furuya, Kenji
Aikawa, Yuri
Hama, Tetsuya
Watanabe, Naoki
ASTROPHYSICAL JOURNAL, 2019, 882 (02):
[8] Efficient ortho-para conversion of H2 on interstellar grain surfaces
Bron, Emeric
Le Petit, Franck
Le Bourlot, Jacques
ASTRONOMY & ASTROPHYSICS, 2016, 588
[9] Magnetic field acceleration of the ortho-para H2 conversion on transition oxides
Ilisca, E
Paris, S
PHYSICAL REVIEW LETTERS, 1999, 82 (08) : 1788 - 1791
[10] ORTHO-PARA CONVERSION OF H2 AND D2 DILUTED IN SOLID HD
URANO, K
MOTIZUKI, K
SOLID STATE COMMUNICATIONS, 1967, 5 (09) : 691 - &

← 1 2 3 4 5 →