Resonant tunneling through the repulsive Coulomb barrier of a quadruply charged molecular anion

Phuong Diem Dau, Hong-Tao Liu, Ji-Ping Yang, Marc-Oliver Winghart, Thomas J. A. Wolf, Andreas-Neil Unterreiner, Patrick Weis, Yu-Run Miao, Chuan-Gang Ning, Manfred M. Kappes, and Lai-Sheng Wang
Phys. Rev. A 85, 064503 – Published 25 June 2012

Abstract

Multiply charged anions possess a repulsive Coulomb barrier (RCB) against electron emission, thus allowing for long-lived metastable species with negative electron binding energies. For the prototypical multianion, bisdisulizole tetra-anion, we demonstrate that electronically excited states supported by the RCB can undergo resonant tunneling. The dynamics of this process was investigated by one-photon photoelectron imaging and femtosecond pump-probe photoelectron spectroscopy and confirmed by theoretical calculations. Efficient resonant tunneling emission of electrons from the excited states of multianions may be common for systems with sufficiently large RCB. This may provide new opportunities to study electron emission dynamics in complex systems.

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  • Received 14 February 2012

DOI:https://doi.org/10.1103/PhysRevA.85.064503

©2012 American Physical Society

Authors & Affiliations

Phuong Diem Dau1, Hong-Tao Liu1, Ji-Ping Yang2,3, Marc-Oliver Winghart2, Thomas J. A. Wolf2, Andreas-Neil Unterreiner2, Patrick Weis2, Yu-Run Miao4, Chuan-Gang Ning4,*, Manfred M. Kappes2,5,†, and Lai-Sheng Wang1,‡

  • 1Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
  • 2Institut für Physikalische Chemie, Karlsruhe Institute of Technology, Kaiserstrasse 12, D-76128 Karlsruhe, Germany
  • 3School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, China
  • 4Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
  • 5Institut für Nanotechnologie, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany

  • *ningcg@mail.tsinghua.edu.cn
  • Manfred. Kappes@kit.edu
  • Lai-Sheng_Wang@brown.edu

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Issue

Vol. 85, Iss. 6 — June 2012

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