Scanning tunneling spectroscopy

About: Scanning tunneling spectroscopy is a research topic. Over the lifetime, 7886 publications have been published within this topic receiving 213828 citations.

Direct observation of surface chemical order by scanning tunneling microscopy.

Abstract: We present the first scanning tunneling microscopy (STM) study which allows clear discrimination of two chemical species in a metal alloy. Special tunneling conditions, which we attribute to an adsorbate at the STM tip, cause a difference in corrugation between Pt and Ni atoms of 0.3 \AA{}. The STM data reveal chemical short-range order at the surface, which is in agreement with embedded atom simulations and can be understood as small domains of an L${1}_{0}$ ordered phase.

Direct Evidence of Electron Tunneling in the Ionization of Sputtered Atoms

Abstract: Direct evidence has been obtained for electron tunneling between sputtered Cs/sup +/ ions and the solid surfaces from which they originate. Strong neutralization of the Cs/sup +/ ions is observed whenever the tunneling channel is opened by changing the surface work function so that a crossing of the Fermi level by the Cs 6s level occurs. A tunneling model which takes the spatial dependences of the position and the width of the atomic level into account explains the data successfully.

Electronic spin detection in molecules using scanning-tunneling- microscopy-assisted electron-spin resonance

Abstract: By combining the spatial resolution of a scanning-tunneling microscope (STM) with the electronic spin sensitivity of electron-spin resonance, we show that it is possible to detect the presence of localized spins on surfaces The principle is that a STM is operated in a magnetic field, and the resulting component of the tunnel current at the Larmor (precession) frequency is measured This component is nonzero whenever there is tunneling into or out of a paramagnetic entity We have succeeded in obtaining spectra from free radical molecules from which the g factor of a spin entity may be inferred For the molecules studied here, α,γ-bisdiphenylene-β-phenylallyl, g was found to be 2±01

Effective Tunneling Density of States in Superconductors

Abstract: Results of a theoretical determination of the tunneling characteristic, that agree well with structure observed in the I-V characteristic of superconducting metals, are presented. Experimental and theoretical curves for the density of states show good agreement. (D.C.W.)