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Journal Articles

Ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

Ueta, Hirokazu; Fukutani, Katsuyuki

Vacuum and Surface Science, 64(9), p.430 - 434, 2021/09

Journal Articles

Direct measurement of fast ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

Physical Review B, 102(12), p.121407_1 - 121407_5, 2020/09

 Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)

Ortho-to-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, photo-stimulated 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 the two-step process based on the hyperfine-Coulomb excitation.

Oral presentation

Rotational state distribution of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

no journal, , 

Oral presentation

Rotational-state distribution and ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

no journal, , 

Oral presentation

Rotational-state distribution and ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

no journal, , 

While hydrogen typically chemisorbs dissociatively on a flat metal surface, it is known that hydrogen can molecularly chemisorb on stepped surfaces, such as Pd(210). In this study, using a combination of a pulsed molecular beam, photo-stimulated desorption and resonance-enhanced multiphoton ionization techniques, the rotational states of molecularly chemisorbed H$$_{2}$$ are probed. We will present the rotational state distribution of photo-desorbed H$$_{2}$$, and the o-p conversion process of molecularly chemisorbed H$$_{2}$$ will be discussed.

Oral presentation

A Study of ortho-para conversion of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

no journal, , 

Surface defects such as step and kink affect surfaced reaction. While hydrogen typically chemisorbs dissociatively on a flat metal surface, it is known that hydrogen can molecularly chemisorb on stepped surfaces, such as Pd(210). Recently, we developed a technique to probe ortho-para conversion of adsorbed hydrogen which consists of a combination of a pulsed molecular beam, photo-stimulated desorption and resonance-enhanced multiphoton ionization techniques. We report a result of orho-para conversion time of molecularly chemisorbed H$$_{2}$$ on Pd(210).

Oral presentation

Measurement of ortho-para conversion time of molecularly chemisorbed H$$_{2}$$ on Pd(210)

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

no journal, , 

no abstracts in English

Oral presentation

Dissociative chemisorption of vibrationally excited methane

Ueta, Hirokazu

no journal, , 

no abstracts in English

Oral presentation

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

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

no journal, , 

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.

Oral presentation

A Role of rotational energy transfer in H$$_{2}$$ ortho-para conversion

Ueta, Hirokazu; Fukutani, Katsuyuki

no journal, , 

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