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  Field desorption of H3 and field dissociation of H+3

Reckzügel, M., Drachsel, W., & Block, J. H. (1994). Field desorption of H3 and field dissociation of H+3. Applied Surface Science, 76-77, 108-114. doi:10.1016/0169-4332(94)90330-1.

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Reckzügel, Markus1, Author           
Drachsel, Wolfgang1, Author           
Block, Jochen H.1, Author           
Affiliations:
1Fritz Haber Institute, Max Planck Society, ou_24021              

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 Abstract: Ab-initio calculations using a non-local spin-density approximation have been done for linear and triangular H+3 ions in an external homogenous electric field. From these calculations it is predicted that linear H+3 is not stable above 2 V/Å if its molecular axis is parallel to the field vector, whereas triangular H+3 resists field dissociation up to at least 3.1 V/Å.

Linear H3 is formed at kink sites on the surface of the field emitter. Laser-stimulated field desorption of that H3 could lead to linear H+3. In spite of the rotation of the H+3 ion, a majority should field-dissociate in fields greater than 2.4 V/Å. However, if the linear H3 is bending during laser-stimulated field desorption the more stable triangular H+3 will be formed upon field ionization.

The H+3 field dissociation for fields between 2.4 and 3.1 V/Å was experimentally investigated using laser pulse correlated ion pair spectroscopy in combination with a pulsed-laser atom probe. During these measurements a total of 605 H+3 ions arrived at the time-of-flight detector, but only one event occurred which could be attributed to H+3 field dissociation. However, H+2, formed by field ionization of the H+3 field dissociation product H2, could have been field-dissociated also. Therefore the H+2 field-dissociation probability has been calculated for the case where the H+2 molecular axis is parallel to the field vector. Taking this maximum dissociation probability of H+2 into account, it followed from processing of the measured yields that the H+3 field-dissociation probability is smaller than that of field-desorbed H+2 for fields up to 3.1 V/Å. Hence, it is inferred that linear H3 bends during laser-stimulated field desorption, resulting in a more stable triangular H+3 after field ionization.

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Language(s): eng - English
 Dates: 1993-08-021993-10-201994-03-02
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0169-4332(94)90330-1
 Degree: -

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Title: Applied Surface Science
  Abbreviation : Appl. Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: 7 Volume / Issue: 76-77 Sequence Number: - Start / End Page: 108 - 114 Identifier: ISSN: 0169-4332
CoNE: https://pure.mpg.de/cone/journals/resource/954928576736