TOF spectra of direct recoils. II. Interaction of H2 with clean and oxidized magnesium

Moshe H. Mintz; J. Albert Schultz; J. Wayne Rabalais

doi:10.1016/0039-6028(84)90442-4

TOF spectra of direct recoils. II. Interaction of H₂ with clean and oxidized magnesium

Moshe H. Mintz, J. Albert Schultz, J. Wayne Rabalais

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The interaction of gaseous hydrogen with clean and oxidized polycrystalline magnesium surfaces has been studied by time-of-flight (TOF) analysis of directly recoiled surface atoms (neutrals plus ions) produced by pulsed Ar⁺ ion irradiation. The spectra exhibit no surface hydrogen for H₂ exposures up to 2000 L on clean magnesium, indicating that either hydrogen does not react at all or it reacts to yield a totally subsurface hydrogen product. Oxidized magnesium reacts with H₂ to yield a product with a surface stoichiometry of approximately one hydrogen to one MgO pair. The H₂/MgO reaction kinetics fit a one-site adsorption model with H₂ sticking probability of 8 × 10^-4. The direct recoil technique is sensitive to the structural change resulting from the reaction of hydrogen with MgO.

Original language	English
Pages (from-to)	457-466
Number of pages	10
Journal	Surface Science
Volume	146
Issue number	2-3
DOIs	https://doi.org/10.1016/0039-6028(84)90442-4
State	Published - 1 Nov 1984
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/0039-6028(84)90442-4

Cite this

@article{649b7f9c08534ddc8f8715c568961abf,

title = "TOF spectra of direct recoils. II. Interaction of H2 with clean and oxidized magnesium",

abstract = "The interaction of gaseous hydrogen with clean and oxidized polycrystalline magnesium surfaces has been studied by time-of-flight (TOF) analysis of directly recoiled surface atoms (neutrals plus ions) produced by pulsed Ar+ ion irradiation. The spectra exhibit no surface hydrogen for H2 exposures up to 2000 L on clean magnesium, indicating that either hydrogen does not react at all or it reacts to yield a totally subsurface hydrogen product. Oxidized magnesium reacts with H2 to yield a product with a surface stoichiometry of approximately one hydrogen to one MgO pair. The H2/MgO reaction kinetics fit a one-site adsorption model with H2 sticking probability of 8 × 10-4. The direct recoil technique is sensitive to the structural change resulting from the reaction of hydrogen with MgO.",

author = "Mintz, {Moshe H.} and Schultz, {J. Albert} and Rabalais, {J. Wayne}",

note = "Funding Information: This material is based upon work supported by the National Science Foundation under Grant No. CHE-8209398. J.A.S. and J.W.R. would like to thank P.H. Citrin for some useful comments.",

year = "1984",

month = nov,

day = "1",

doi = "10.1016/0039-6028(84)90442-4",

language = "English",

volume = "146",

pages = "457--466",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "2-3",

}

TY - JOUR

T1 - TOF spectra of direct recoils. II. Interaction of H2 with clean and oxidized magnesium

AU - Mintz, Moshe H.

AU - Schultz, J. Albert

AU - Rabalais, J. Wayne

N1 - Funding Information: This material is based upon work supported by the National Science Foundation under Grant No. CHE-8209398. J.A.S. and J.W.R. would like to thank P.H. Citrin for some useful comments.

PY - 1984/11/1

Y1 - 1984/11/1

N2 - The interaction of gaseous hydrogen with clean and oxidized polycrystalline magnesium surfaces has been studied by time-of-flight (TOF) analysis of directly recoiled surface atoms (neutrals plus ions) produced by pulsed Ar+ ion irradiation. The spectra exhibit no surface hydrogen for H2 exposures up to 2000 L on clean magnesium, indicating that either hydrogen does not react at all or it reacts to yield a totally subsurface hydrogen product. Oxidized magnesium reacts with H2 to yield a product with a surface stoichiometry of approximately one hydrogen to one MgO pair. The H2/MgO reaction kinetics fit a one-site adsorption model with H2 sticking probability of 8 × 10-4. The direct recoil technique is sensitive to the structural change resulting from the reaction of hydrogen with MgO.

AB - The interaction of gaseous hydrogen with clean and oxidized polycrystalline magnesium surfaces has been studied by time-of-flight (TOF) analysis of directly recoiled surface atoms (neutrals plus ions) produced by pulsed Ar+ ion irradiation. The spectra exhibit no surface hydrogen for H2 exposures up to 2000 L on clean magnesium, indicating that either hydrogen does not react at all or it reacts to yield a totally subsurface hydrogen product. Oxidized magnesium reacts with H2 to yield a product with a surface stoichiometry of approximately one hydrogen to one MgO pair. The H2/MgO reaction kinetics fit a one-site adsorption model with H2 sticking probability of 8 × 10-4. The direct recoil technique is sensitive to the structural change resulting from the reaction of hydrogen with MgO.

UR - http://www.scopus.com/inward/record.url?scp=4243646885&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(84)90442-4

DO - 10.1016/0039-6028(84)90442-4

M3 - Article

AN - SCOPUS:4243646885

SN - 0039-6028

VL - 146

SP - 457

EP - 466

JO - Surface Science

JF - Surface Science

IS - 2-3

ER -

TOF spectra of direct recoils. II. Interaction of H₂ with clean and oxidized magnesium

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this