High-energy resolution photoemission microspectroscopy: (1 1 1) domains featured by the Shockley and the image-potential states at a polycrystalline Cu surface

Sugiyama, Takeharu; Masuda, Takuya; Aida, M.; Ueno, Nobuo; Munakata, Toshiaki

doi:10.1016/j.elspec.2004.02.032

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…The laser power was kept to be 0.13 nJ/pulse in order to avoid destruction of the SAMs and the influence of the space charge effect. 32 Note that all the 2PPE experiments were done with a single color, and thus, pump and probe pulses were not distinguished in this study. Photoelectrons emitted normal to the surface via two-photon processes were detected with a hemispherical electron energy analyzer (Thermo VG Scientific Alpha 110).…”

Section: Methodsmentioning

confidence: 99%

“…The light was focused onto the sample in the UHV chamber at an incident angle of 55° to the sample surface using an f = 400 mm concave mirror; the diameter of the spot size on the sample was up to 0.1 mm. The laser power was kept to be 0.13 nJ/pulse in order to avoid destruction of the SAMs and the influence of the space charge effect . Note that all the 2PPE experiments were done with a single color, and thus, pump and probe pulses were not distinguished in this study.…”

Section: Methodsmentioning

confidence: 99%

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Electronic States of Alkanethiolate Self-Assembled Monolayers on Au(111) Studied by Two-Photon Photoemission Spectroscopy

et al. 2012

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Two-photon photoemission (2PPE) spectroscopy has been employed to probe the electronic states of n-alkanethiolate self-assembled monolayers (SAMs) on an Au(111) substrate fabricated in a wet chemical process. Electronic states newly formed in the SAM formation were observed below and above the Fermi level (E F) for various alkyl chain lengths of C12-, C18-, and C22-SAMs. At 3.5–3.7 eV above E F, an unoccupied state originating from a bond between gold and sulfur atoms appears, a state that shows little dispersion with parallel to the surface. The peak position of the unoccupied state depends on the substrate temperature, and it was stabilized with increasing temperature; E F +3.7 eV at 85 K and E F +3.5 eV at 330 K for C18-SAM. The stabilization of the state is attributed to the increase of intermolecular interaction at sulfur atoms with their neighboring S atoms, which is caused by a change in the tilt angle of the alkyl chains in the SAM: on increasing the temperature, the interaction between S atoms in the SAM is promoted by the more upright alkyl chains.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Electronic States of Alkanethiolate Self-Assembled Monolayers on Au(111) Studied by Two-Photon Photoemission Spectroscopy

et al. 2012

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“…Photoelectrons emitted to the surface normal were detected with a hemispherical energy analyzer (VG 100AX) of 20 meV-energy resolution. The energy resolution including the analyzer and the spectral width of the VUV light was about 30 meV [7]. The sample was scanned with 0.1 lm-resolution.…”

Section: Methodsmentioning

confidence: 99%

“…By focusing coherent VUV radiation at a wavelength of 140 nm (8.86 eV photon energy), our micro-spot ultraviolet photoemission spectroscopy (micro-UPS) achieved 0.3 lm-lateral resolution and 30 meV-energy resolution [4][5][6][7]. We apply micro-UPS to a thin film of copper phthalocyanine (CuPc) deposited on a polycrystalline copper substrate, demonstrating the high lateral/energy resolutions can successfully reveal inhomogeneous electronic structures [8].…”

Section: Introductionmentioning

confidence: 94%

Laser-based photoemission micro-spectroscopy for occupied and unoccupied states of inhomogeneous surfaces

2005

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Excited electron dynamics at ferrocene-terminated self-assembled monolayers on Au(111): Lengthened lifetime of image potential state

Hirata

Shibuta

Eguchi

et al. 2013

Chemical Physics Letters

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High-energy resolution photoemission microspectroscopy: (1 1 1) domains featured by the Shockley and the image-potential states at a polycrystalline Cu surface

Cited by 6 publications

References 10 publications

Electronic States of Alkanethiolate Self-Assembled Monolayers on Au(111) Studied by Two-Photon Photoemission Spectroscopy

Electronic States of Alkanethiolate Self-Assembled Monolayers on Au(111) Studied by Two-Photon Photoemission Spectroscopy

Laser-based photoemission micro-spectroscopy for occupied and unoccupied states of inhomogeneous surfaces

Excited electron dynamics at ferrocene-terminated self-assembled monolayers on Au(111): Lengthened lifetime of image potential state

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