Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy

S. Reynolds, A. Peasgood, D. P. Oxley, R. G. Pritchard, D. G. Walmsley, J. L. Tomlin, R. J. Turner

    Research output: Contribution to journalArticle

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    Abstract

    Results are presented which indicate that the measured peak position in inelastic electron tunnelling spectroscopy (IETS) is dependent, for certain vibrational modes, on the polarity of the bias voltage. Reproducible peak shifts on bias reversal of 2.2+or-0.5 mV and 0.30+or-0.05 mV occur for the O-H stretching mode in undoped junctions and the 144 mV mode in benzoate-doped junctions, respectively. A simple model, involving perturbation of mode energy by the large electric field present in the tunnel junction, is suggested. The results agree satisfactorily with the predictions of this model in the case of the O-H mode, but it has not proved possible to make a similar comparison for the benzoate modes due to a lack of anharmonicity data. The extent to which such models rely upon a detailed knowledge of the molecular environment, and the possible consequences of the 'built-in' barrier electric field on IET spectra are briefly discussed.
    Original languageEnglish
    Pages (from-to)4297-4306
    Number of pages10
    JournalJournal of Physics C-Solid State Physics
    Volume20
    Issue number27
    DOIs
    Publication statusPublished - 1987

    Fingerprint

    Electron tunneling
    electron tunneling
    vibration mode
    polarity
    Spectroscopy
    Electric fields
    spectroscopy
    Tunnel junctions
    Bias voltage
    Stretching
    energy
    electric fields
    tunnel junctions
    perturbation
    shift
    electric potential
    predictions

    Cite this

    Reynolds, S. ; Peasgood, A. ; Oxley, D. P. ; Pritchard, R. G. ; Walmsley, D. G. ; Tomlin, J. L. ; Turner, R. J. / Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy. In: Journal of Physics C-Solid State Physics. 1987 ; Vol. 20, No. 27. pp. 4297-4306.
    @article{7cc95570a92c4b62a8eddc1a2cf01131,
    title = "Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy",
    abstract = "Results are presented which indicate that the measured peak position in inelastic electron tunnelling spectroscopy (IETS) is dependent, for certain vibrational modes, on the polarity of the bias voltage. Reproducible peak shifts on bias reversal of 2.2+or-0.5 mV and 0.30+or-0.05 mV occur for the O-H stretching mode in undoped junctions and the 144 mV mode in benzoate-doped junctions, respectively. A simple model, involving perturbation of mode energy by the large electric field present in the tunnel junction, is suggested. The results agree satisfactorily with the predictions of this model in the case of the O-H mode, but it has not proved possible to make a similar comparison for the benzoate modes due to a lack of anharmonicity data. The extent to which such models rely upon a detailed knowledge of the molecular environment, and the possible consequences of the 'built-in' barrier electric field on IET spectra are briefly discussed.",
    author = "S. Reynolds and A. Peasgood and Oxley, {D. P.} and Pritchard, {R. G.} and Walmsley, {D. G.} and Tomlin, {J. L.} and Turner, {R. J.}",
    year = "1987",
    doi = "10.1088/0022-3719/20/27/009",
    language = "English",
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    pages = "4297--4306",
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    Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy. / Reynolds, S.; Peasgood, A.; Oxley, D. P.; Pritchard, R. G.; Walmsley, D. G.; Tomlin, J. L.; Turner, R. J.

    In: Journal of Physics C-Solid State Physics, Vol. 20, No. 27, 1987, p. 4297-4306.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy

    AU - Reynolds, S.

    AU - Peasgood, A.

    AU - Oxley, D. P.

    AU - Pritchard, R. G.

    AU - Walmsley, D. G.

    AU - Tomlin, J. L.

    AU - Turner, R. J.

    PY - 1987

    Y1 - 1987

    N2 - Results are presented which indicate that the measured peak position in inelastic electron tunnelling spectroscopy (IETS) is dependent, for certain vibrational modes, on the polarity of the bias voltage. Reproducible peak shifts on bias reversal of 2.2+or-0.5 mV and 0.30+or-0.05 mV occur for the O-H stretching mode in undoped junctions and the 144 mV mode in benzoate-doped junctions, respectively. A simple model, involving perturbation of mode energy by the large electric field present in the tunnel junction, is suggested. The results agree satisfactorily with the predictions of this model in the case of the O-H mode, but it has not proved possible to make a similar comparison for the benzoate modes due to a lack of anharmonicity data. The extent to which such models rely upon a detailed knowledge of the molecular environment, and the possible consequences of the 'built-in' barrier electric field on IET spectra are briefly discussed.

    AB - Results are presented which indicate that the measured peak position in inelastic electron tunnelling spectroscopy (IETS) is dependent, for certain vibrational modes, on the polarity of the bias voltage. Reproducible peak shifts on bias reversal of 2.2+or-0.5 mV and 0.30+or-0.05 mV occur for the O-H stretching mode in undoped junctions and the 144 mV mode in benzoate-doped junctions, respectively. A simple model, involving perturbation of mode energy by the large electric field present in the tunnel junction, is suggested. The results agree satisfactorily with the predictions of this model in the case of the O-H mode, but it has not proved possible to make a similar comparison for the benzoate modes due to a lack of anharmonicity data. The extent to which such models rely upon a detailed knowledge of the molecular environment, and the possible consequences of the 'built-in' barrier electric field on IET spectra are briefly discussed.

    U2 - 10.1088/0022-3719/20/27/009

    DO - 10.1088/0022-3719/20/27/009

    M3 - Article

    VL - 20

    SP - 4297

    EP - 4306

    JO - Journal of Physics C-Solid State Physics

    JF - Journal of Physics C-Solid State Physics

    SN - 0022-3719

    IS - 27

    ER -