Electron induced ortho-meta isomerization of single molecules |
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Authors: | Simic-Milosevic V Mehlhorn M Rieder K-H Meyer J Morgenstern K |
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Institution: | Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimalle 14, 14195 Berlin, Germany. simic@fhi-berlin.mpg.de |
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Abstract: | A scanning tunneling microscope operating at 5 K is used to induce the isomerization of single chloronitrobenzene molecules on Cu(111) and verify the reaction. The threshold voltage of (227+/-7) mV for this reaction is explained based on electron-induced vibrational heating. We propose that the isomerization is initiated by simultaneous excitation of two vibrational molecular modes via inelastically tunneling electrons. This excitation results in a shift of the distribution probability of chlorine and hydrogen positions, which facilitates their mutual exchange. |
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