Photoelectron spectra of some aromatic mono- and di-ketones

McAlduff, E. J.; Bunbury, David L.

doi:10.1016/0368-2048(79)85030-6

Cited by 13 publications

(10 citation statements)

References 14 publications

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“…The two peaks at the lower binding energy side were assigned as the n0 (nonbonding orbital of O) and phenyl π-orbital (Ph S + Ph A ). 24 The results shown in Figure 2a clearly indicate that the spectrum for acetophenone lines [Figure 2a(iii)] looks similar (except for the shoulder at ∼6.8 eV instead of sharp peaks) to that of benzophenone lines [Figure 2a(iv)], while the spectrum for acetone lines [Figure 2a(ii)] is different from that of acetophenone and benzophenone lines. The peaks arising from acetophenone lines were identified at 3.8, 9.2, and 11.4 eV.…”

Section: Resultsmentioning

confidence: 92%

“…The spectrum of solid benzophenone was shifted (∼1 eV) to align the higher binding energy peaks with the 11.2 eV peak of the benzophenone line. The two peaks at the lower binding energy side were assigned as the n0 (nonbonding orbital of O) and phenyl π-orbital (Ph S + Ph A ) . The results shown in Figure a clearly indicate that the spectrum for acetophenone lines [Figure a(iii)] looks similar (except for the shoulder at ∼6.8 eV instead of sharp peaks) to that of benzophenone lines [Figure a(iv)], while the spectrum for acetone lines [Figure a(ii)] is different from that of acetophenone and benzophenone lines.…”

Section: Resultsmentioning

confidence: 99%

“…(a) UPS spectra of one-dimensional molecular lines of (i) H-terminated Si(100) -(2 × 1), (ii) adsorbed acetone (before and after annealing), (iii) acetophenone, and (iv) benzophenone on the Si(100)-(2 × 1)-H surface at 300 K. The photoelectron spectrum of solid benzophenone (v) is also included for comparison. The spectrum of solid benzophenone was extracted from ref and aligned with the higher binding energy peak of benzophenone by the energy shift of ∼1 eV. For clarity the baselines of the spectra were shifted.…”

Section: Resultsmentioning

confidence: 99%

“…To explore the origin of the peaks observed for benzophenone lines, we also measured the UPS spectra of 1-D assemblies formed by acetophenone and acetone molecules, and compared those spectra with that of benzophenone and H-terminated surfaces in Figure a, spectra i−iv. The photoelectron spectrum of solid benzophenone sample (extracted from the ref ) was included as Figure a(v). The spectrum of solid benzophenone was shifted (∼1 eV) to align the higher binding energy peaks with the 11.2 eV peak of the benzophenone line.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, we ascribed the 5.3 eV peak (or shoulder) to the nonbonding orbital of the O atom, which was shifted (by ∼1.7 eV) because of direct bonding with the substrate silicon atom. Note that the binding energy difference between the nonbonding orbital of O in >CO (carbonyl) and >C−O−C (ether) is ∼2 eV …”

Section: Discussionmentioning

confidence: 99%

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Valence States of One-Dimensional Molecular Assembly Formed by Ketone Molecules on the Si(100)-(2 × 1)-H Surface

2009

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The valence states of 1-D molecular assemblies of adsorbed benzophenone, acetophenone, and acetone on the Si(100)-(2 × 1)-H surface were studied with ultraviolet photoelectron spectroscopy (UPS) at room temperature. The molecular assemblies formed on the surface were checked by using in situ scanning tunneling microscopy (STM). Four major peaks at 3.8, 6.8, 9.0, and 11.2 eV relative to the Fermi level were observed in the UPS spectrum of benzophenone lines. The spectral shape of the benzophenone line is similar to that of acetophenone (except a shoulder at ∼6.8 eV instead of the intense peak) but very different from that of acetone, where the major peaks appear at 5.3, 7.6, and 9.2 eV. These suggest that the major peaks appearing for benzophenone and acetophenone lines arise from the phenyl rings of the adsorbed molecules. Comparison of the UPS spectra of benzophenone lines on the Si(100)-(2 × 1)-H surface and that of solid benzophenone clearly indicate that the electronic states of the phenyl rings assembled in 1-D remain largely decoupled from the substrate electronic states, i.e., the π orbitals of the phenyl ring have little or no interaction with the substrate. These findings reinforced the potential of such π-conjugated molecular assembly in fabricating the molecular-scale device with silicon surface as a template.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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