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Dive into the research topics where N.A. Booth is active.

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Featured researches published by N.A. Booth.


Surface Science | 1998

Determination of the local structure of glycine adsorbed on Cu(110)

N.A. Booth; D.P. Woodruff; O. Schaff; T. Gießel; R. Lindsay; P. Baumgärtel; A. M. Bradshaw

Abstract Scanned-energy mode N 1s and O 1s photoelectron diffraction has been used to determine the local geometry of glycine adsorbed on Cu(110) in an ordered (3 × 2) phase. The results are consistent with a molecular geometry in which the CC axis lies approximately parallel to the surface and the molecule bonds across a pair of [110] Cu surface rows through the two oxygen atoms of the carboxyl group and the N atom of the amino group. The N atom is displaced by 0.24 ± 0.10 A off an atop site along the [110] rows with a CuN nearest-neighbour distance of 2.04 ± 0.02 A . The carboxyl bonds to two Cu atoms in a [110] row, with the O atoms displaced 0.80 ± 0.07 A from atop in [001] towards the amino group with a CuO nearest-neighbour bond length of 2.03 ± 0.03 A and a resulting tilt of the OCu bond relative to the surface normal of 23 ± 2°. A specific structural model comprising two molecular moieties per unit mesh which has the space group p1g1, consistent with the qualitative LEED observations, is proposed on the basis of these data.


Surface Science | 1997

Structure determination of ammonia on Cu(110) — a low-symmetry adsorption site

N.A. Booth; R. Davis; Rachel L. Toomes; D.P. Woodruff; C.J. Hirschmugl; K.-M. Schindler; O. Schaff; V. Fernandez; A. Theobald; Ph. Hofmann; Robert Lindsay; T. Gießel; P. Baumgärtel; A.M. Bradshaw

Abstract The local adsorption structure of ammonia on Cu(110) has been determined in a quantitative fashion using N 1s scanned-energy mode photoelectron diffraction. While inversion of the photoelectron diffraction spectra using a direct method indicates that the adsorbed NH 3 molecules are near to atop sites, a fuller multiple scattering analysis shows that the molecule is actually displaced 0.37 A off the atop site in a 〈100〉 azimuth. The result is ascribed to adsorbate-adsorbate interactions (steric hindrance) similar to those found in (2 × 1)CO (pmg) structures seen on several fcc (110) surfaces, although in the case of ammonia, it occurs at coverages well below saturation, implying that adsorbate-adsorbate attraction also occurs. These general conclusions are entirely consistent with those of a recent ESDIAD study of this system.


Surface Science | 1996

Quantitative structure determination of an NHx species adsorbed on Cu(110)

C.J. Hirschmugl; K.-M. Schindler; O. Schaff; V. Fernandez; A. Theobald; Ph. Hofmann; A.M. Bradshaw; R. Davis; N.A. Booth; D.P. Woodruff; V. Fritzsche

Abstract Using scanned energy mode photoelectron diffraction we have recently investigated the local structure of NH 3 and NH x ( x = 1 or 2) on Cu(110). NH 3 was found to occupy the atop site on the closed-packed Cu rows in the first layer. The NH x species, discussed in more detail in the present paper, occupies the short bridge site on the outermost 〈110〉 rows, at a height of 1.40 ± 0.02 A above the surface, resulting in a CuN nearest neighbour distance of 1.89 A.


Surface Science | 1996

An integrated approach to adsorbate structure determination using photoelectron diffraction : direct imaging and quantitative simulation

D.P. Woodruff; R. Davis; N.A. Booth; A.M. Bradshaw; C.J. Hirschmugl; K.-M. Schindler; O. Schaff; V. Fernandez; A. Theobald; Ph. Hofmann; V. Fritzsche

Abstract Using scanned-energy mode photoelectron diffraction (PhD) we have developed a two-stage methodology for the quantitative determination of the local geometry of molecular adsorbates on surfaces. The first stage involves the inversion of the experimental adsorbate photoelectron diffraction spectra using a direct method to obtain an “image” of the nearest neighbour substrate atoms. The underlying physics is essentially the same as that of inversion in photoelectron holography, but our method has been shown to be effective for many cases and does not require the collection of additional data. The second stage is to optimise the detailed structure indicated by this “image” using an iterative trial-and-error comparison of the same experimental spectra with the results of simulations based on multiple scattering calculations. Specific examples of this approach which relate to ammonia, CO and hydrocarbon surface chemistry are outlined in this short review; NH3 and NHx (NH or NH2) adsorbed on Cu(110), CH3O on Ni(111) and C2H2 on Ni(111).


Surface Science | 1998

The structure of PF3 adsorbed on Cu(111)

Robert G. Jones; N.E Abrams; G.J. Jackson; N.A. Booth; M.T. Butterfield; B.C.C. Cowie; D.P. Woodruff; M.D. Crapper

The structure of PF3 adsorbed on Cu(111) at 110 K has been determined using both near edge X-ray absorption fine structure (NEXAFS) and normal incidence X-ray standing wave (NIXSW) methods. Two X-ray reflection conditions were used, the (111) and (111), to determine the atomic positions of the phosphorus and fluorine atoms by triangulation using NIXSW, whereas NEXAFS was used to determine the alignment of the molecule. PF3 adsorbs at atop sites with the fluorine atoms away from the surface and its C3 axis aligned along the surface normal. The Cu–P distance is 2.25±0.04 A, and the distance between the copper and the fluorine layers along the C3 axis is 3.05±0.04 A. The adsorbed molecule maintains its gas-phase geometry and undergoes either free rotation about the C3 axis, or is azimuthally orientated such that the projections of the P–F bonds on to the surface point towards the next nearest neighbour copper atoms. The NIXSW analysis for the fluorine photoemission data was carried out using a backward/forward asymmetry parameter to compensate for a breakdown in the dipole approximation for photoemission that occurs for fluorine 1s photoemission under the NIXSW conditions used here.


Journal of Electron Spectroscopy and Related Phenomena | 1995

Direct methods for adsorbate structure determination using photoelectron diffraction

O. Schaff; Ph. Hofmann; C.J. Hirschmugl; A. Theobald; V. Fernandez; K.-M. Schindler; A. M. Bradshaw; N.A. Booth; R. Davis; D.P. Woodruff

Abstract We describe the application of two direct methods for the transformation of scanned-energy mode photoelectron diffraction spectra which are capable of providing useful adsorption site identifications, and which form part of an integrated methodology for quantitative adsorbate structure determination. We draw some comparisons between the principles and proven success of this approach and that of ‘photoelectron holography’. Specific examples given include the adsorption sites of intact and partially reacted ammonia-derived species on Cu(110), the methoxy species, CH 3 O-, on Ni(111), and the growth on Fe on Cu(111).


Surface Science | 2000

The coverage dependence of the local structure of C on Ni(100): a structural precursor to adsorbate-induced reconstruction

R. Terborg; Jon T. Hoeft; Martin Polcik; R. Lindsay; O. Schaff; A. M. Bradshaw; Rachel L. Toomes; N.A. Booth; D.P. Woodruff; E. Rotenberg; Jonathan D. Denlinger


Surface Science | 1998

CN coordination in the adsorption system Ni(110)c(2×2)–CN: an unexpected geometry

N.A. Booth; R. Davis; D.P. Woodruff; D. Chrysostomou; T. McCabe; D.R. Lloyd; O. Schaff; V. Fernandez; S. Bau; K.-M. Schindler; R. Lindsay; Jon T. Hoeft; R. Terborg; P. Baumgärtel; A. M. Bradshaw


Surface Science | 1998

The structure of NO on Ni(111) at low coverage

R. Lindsay; A. Theobald; T. Gießel; O. Schaff; A. M. Bradshaw; N.A. Booth; D.P. Woodruff


Surface Science | 1997

A photoelectron diffraction study of the structure of ultrathin iron films on Cu{110}

A. Theobald; S. Bao; V. Fernandez; K.-M. Schindler; O. Schaff; V. Fritzsche; A.M. Bradshaw; N.A. Booth; D.P. Woodruff

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R. Davis

University of Warwick

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