Electron tunneling spectroscopy, inelastic

Acronyms lETS (inelastic electron tunneling spectroscopy) [Pg.535]

The current—voltage (I V) characteristic of the metal—insulator—film—metal (M—I—X—M) junction is measured. AC modulation of the voltage can be used with lock-in amplifiers to obtain a plot of the d I/dV against A V (i. e. against electron energy). Liquid helium temperatures are typically required for lETS experiments. [Pg.536]

The sample is a film placed on a thin insulating substrate and then sandwiched between two metallic plates. Molecules adsorbed on an oxide or oxide-supported metal can be studied in this way. [Pg.536]

In the Landauer/Imry limit, the transport through the junction is due to elastic scattering. If the gap between the injection energy and the frontier orbital resonance is large, the Landauer/Buttiker contact time is very small, so that the charge is present on the molecule for a very short time. This means that its interaction with any vibration will be weak, because there just is not time to complete a full vibrational period before the charge has gone into the electrode sink. [Pg.20]

When the gap is large, the sketch in Fig. 9 shows that a second channel will open when there is a vibrational resonance - that is, when eV = ho, with o one of the vibrational frequencies of the molecule. This is vibronic resonance, and energy will transfer from the momentum of the tunneling electrons into the vibrations of the molecule. The interaction is quite weak (because the tunneling time is so short) [Pg.20]

IETS spectra are usually reported at very low temperatures, and careful data management is required to see the IETS features. [Pg.21]

The interpretation of IETS is helpful in understanding molecular junctions. Several workers have developed techniques for doing so [97-102], some based on quite complex analyses of the full Green s function [99-101], others based on a much simpler analysis in which the fact that the response is so weak is used as the basis for perturbative expansion[98]. The results of these analyses fit the spectra well. [Pg.21]

It is also possible to deduce pathways in a more adventurous way by noting which modes are enhanced, doing the normal coordinate analysis to find out where those modes have their maximum amplitudes, and arguing that this describes the pathway for the electron going through the molecule. An example is shown in Fig. 11, also from Troisi s work [108]. [Pg.21]

Another technique that has proved useful in establishing chemical bonding of coupling agents at interfaces is inelastic electron tunneling spectroscopy (ITES). For example. Van Velzen [16] examined 3-(trimethoxysilyl)propanethiol by this technique. Approximately monolayer quantities of this silane were adsorbed on the barrier oxide of an aluminum-aluminum oxide-metal tunneling junction two metals were investigated, lead and silver. It was concluded that the silane is... [Pg.417]

Despite the enormous impact that scanning probe methods have had on our understanding of reactions at oxide surfaces, both STM and AFM suffer from the lack of chemical specificity. The application of STM-inelastic electron tunneling spectroscopy is a potential solution as it can be used to measure the vibrational spectrum of individual molecules at the surface [69, 70]. [Pg.236]

Section 5 is on one particular molecule, p-benzene dithiol. This is one of the most commonly studied molecules in molecular electronic transport junctions [7] (although it is also one of the most problematic). Section 6 discusses a separate measurement, inelastic electron tunneling spectroscopy [8, 9] (IETS). This can be quite accurate because it can be done on single molecules at low temperatures. It occurs because of small perturbations on the coherent transport, but it can be very indicative of such issues as the geometrical arrangement in the molecular transport junction, and pathways for electron transport through the molecular structure. [Pg.3]

Wang W, Lee T, Kretzschmar I, Reed MA (2004) Inelastic electron tunneling spectroscopy of an alkanedithiol self-assembled monolayer. Nano Lett 4(4) 643-646... [Pg.34]

Galperin M, Ratner MA, Nitzan A (2004) Inelastic electron tunneling spectroscopy in molecular junctions peaks and dips. J Chem Phys 121 (23) 11965—11979... [Pg.35]

Nakamura H, Yamashita K, Rocha AR, Sanvito S (2008) Efficient ab initio method for inelastic transport in nanoscale devices analysis of inelastic electron tunneling spectroscopy. Phys Rev B 78(23) 235418-235420... [Pg.35]

Troisi A, Ratner MA (2006) Propensity rules for inelastic electron tunneling spectroscopy of single-molecule transport junctions. J Chem Phys 125(21) 214709—214711... [Pg.35]

Honciuc A, Metzger RM, Gong A, Spangler CW (2007) Elastic and inelastic electron tunneling spectroscopy of a new rectifying monolayer. J Am Chem Soc 129 8310-8319... [Pg.83]

Apart from the more conventional transport measurements of molecular junctions at constant bias voltage, alkane(di)thiols-based molecular junctions were also characterized by transition voltage spectroscopy [258, 259], AC voltage modulation [260], and inelastic electron tunneling spectroscopies [261],... [Pg.146]

Hipps KW, Keder JK (1983) A direct comparison of surface Raman spectroscopy and inelastic electron tunneling spectroscopy. J Phys Chem 87 3187-3189... [Pg.210]

Mazur U, Hipps KW (2001) Inelastic electron tunneling spectroscopy. In Chalmers J, Griffiths P (eds) Handbook of vibrational spectroscopy, vol 1. Wiley, New York, pp 812-829... [Pg.210]

Hipps KW, Mazur U (1980) An inelastic electron tunneling spectroscopy study of some iron cyanide complexes. J Phys Chem 84 3162-3172... [Pg.211]

Kirtley J (1980) Inelastic electron tunneling spectroscopy. ACS Symp Ser 137 217-245... [Pg.211]

Kirtley J, Soven P (1979) Multiple-scattering theory of intensities in inelastic-electron-tunneling spectroscopy. Phys Rev B 19 1812-1817... [Pg.211]

Knockenmuss R, Hipps KW (1982) Some proposed modifications in the theory of inelastic electron tunneling spectroscopy and the source of parameters utilized. J Phys Chem 86 4477-4480... [Pg.211]

Weinberg WH (1982) Inelastic electron tunneling spectroscopy of supported homogeneous cluster compounds. Vib Spectra Struct 11 1-50... [Pg.212]

Arroyo CR, Frederiksen T, Rubio-Bollinger G, Velez M, Amau A, Sanchez-Portal D, Agrai t N (2010) Characterization of single-molecule pentanedithiol junctions by inelastic electron tunneling spectroscopy and first-principles calculations. Phys Rev B 81 075405/1-075405/5... [Pg.212]

Okabayashi N, Paulsson M, Ueba H, Konda Y, Komeda T (2010) Site selective inelastic electron tunneling spectroscopy probed by isotope labeling. Nano Lett 10 2950-2955... [Pg.212]

Ando Y, Murai J, Miyazaki T (1999) Analysis of the interface in ferromagnet/insulator junctions by inelastic-electron-tunneling-spectroscopy. J Magn Magn Mater 198-199 161-163... [Pg.212]

Yamaguchi K (1993) Phonon structure of single-crystal gallium thiophosphide (Ga2/3PS3) from inelastic electron tunneling spectroscopy. Phys Status Solidi B 179 K11-K15... [Pg.212]

Seman TR, Mallik RR (1999) Electronic signal regulator for constant resolution inelastic electron tunneling spectroscopy. Rev Sci Instrum 70 2808-2814... [Pg.212]

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