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The lack of a strong secondary electron component on the annealed sample may indicate that the transmission efficiency of the spectrometer is poor at low kinetic energies. This suggests that the peak from SAM surface could have been even stronger. Artificial effects on the peak have been ruled out by testing with different bias voltages
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The lack of a strong secondary electron component on the annealed sample may indicate that the transmission efficiency of the spectrometer is poor at low kinetic energies. This suggests that the peak from SAM surface could have been even stronger. Artificial effects on the peak have been ruled out by testing with different bias voltages.
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25
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34250185316
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For NEA materials, the difference between photoemission spectral width and the excitation energy should match the band-gap value (4, 17-19). Although there is no precise gap value reported for [121]tetramantane-6-thiol, and it is difficult to define a precise photoemission spectral width of an insulating monolayer system (owing to the difficulty in determining the spectral onset), the estimate obtained from our spectra is consistent with the DMC calculation (5), considering that the thiol groups are likely to change the gap value by only a few tenths of an electron volt.
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For NEA materials, the difference between photoemission spectral width and the excitation energy should match the band-gap value (4, 17-19). Although there is no precise gap value reported for [121]tetramantane-6-thiol, and it is difficult to define a precise photoemission spectral width of an insulating monolayer system (owing to the difficulty in determining the spectral onset), the estimate obtained from our spectra is consistent with the DMC calculation (5), considering that the thiol groups are likely to change the gap value by only a few tenths of an electron volt.
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27
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34250178379
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We acknowledge helpful discussions with Z. Liu, D.-H. Lee, and H. Padmore. W.L.Y. thanks Y. Y. Wang for sharing information on diamondoid film deposition and J. Pepper and S. DiMaggio for technical support. The work at Stanford Synchrotron Radiation Laboratory and the Advanced Light Source is supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Material Science, under contracts DE-FG03-01ER45929-A001 and DE-AC03-765F00515, respectively. The work at Stanford is also supported by Chevron through the Stanford-Chevron Program on Diamondoid Nano-Science
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We acknowledge helpful discussions with Z. Liu, D.-H. Lee, and H. Padmore. W.L.Y. thanks Y. Y. Wang for sharing information on diamondoid film deposition and J. Pepper and S. DiMaggio for technical support. The work at Stanford Synchrotron Radiation Laboratory and the Advanced Light Source is supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Material Science, under contracts DE-FG03-01ER45929-A001 and DE-AC03-765F00515, respectively. The work at Stanford is also supported by Chevron through the Stanford-Chevron Program on Diamondoid Nano-Science.
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