One- And two-photon photo emission micro-spectroscopy for organic films

T. Munakata, Masahiro Shibuta, M. Mikamori, T. Yamada, K. Miyakubo, T. Sugiyama, Y. Sonoda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

We have constructed a laser-based microspot photoemission spectrometer which achieved lateral resolution of 0.3 μm and energy resolution of 30 meV. The light source at wavelength of 140 nm (photon energy of 8.86 eV) was generated as the 6-th harmonics of a titanium sapphire laser of 100 fs pulse duration. The high-energy resolution is the characteristics of our apparatus. The space-charge effect which affects the energy resolution and limits the sensitivity was described. The apparatus was applied to reveal spatial inhomogeneity of copper phthalocyanine films caused by intermolecular interaction and inter-layer interaction. We found that the highest occupied molecular orbital is peaking at the binding energies of 1.13, 1.23, and 1.38 eV depending on the film thickness and the sample positions. The peaks were assigned to originate from isolated molecules, ordered monolayer, and the second layer, respectively. The apparatus can also be operated as microspot two-photon photoemission spectrometer which probes unoccupied electronic states. A surface image due to the unoccupied first image potential state of Cu(111) facets showed that the lateral resolution for two photon photoemission with a light of 280 nm wavelength was 0.4 μm, smaller by 1/√2 than the diffraction limited spot size.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6325
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventPhysical Chemistry of Interfaces and Nanomaterials V - San Diego, CA, United States
Duration: 2006 Aug 152006 Aug 17

Other

OtherPhysical Chemistry of Interfaces and Nanomaterials V
CountryUnited States
CitySan Diego, CA
Period06/8/1506/8/17

Fingerprint

Photoemission
Photons
Spectroscopy
Spectrometers
photons
photoelectric emission
spectroscopy
Wavelength
Lasers
Electronic states
Molecular orbitals
Binding energy
Electric space charge
Sapphire
Film thickness
Light sources
Laser pulses
Monolayers
spectrometers
Titanium

Keywords

  • Copper phthalocyanine
  • Electron microscopy
  • Interface states
  • Laser methods
  • Organic films
  • Photoelectron emission
  • Photoelectron spectroscopy
  • Semiconducting films
  • Surface electronic phenomena

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Munakata, T., Shibuta, M., Mikamori, M., Yamada, T., Miyakubo, K., Sugiyama, T., & Sonoda, Y. (2006). One- And two-photon photo emission micro-spectroscopy for organic films. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6325). [63250M] https://doi.org/10.1117/12.679894

One- And two-photon photo emission micro-spectroscopy for organic films. / Munakata, T.; Shibuta, Masahiro; Mikamori, M.; Yamada, T.; Miyakubo, K.; Sugiyama, T.; Sonoda, Y.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6325 2006. 63250M.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Munakata, T, Shibuta, M, Mikamori, M, Yamada, T, Miyakubo, K, Sugiyama, T & Sonoda, Y 2006, One- And two-photon photo emission micro-spectroscopy for organic films. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6325, 63250M, Physical Chemistry of Interfaces and Nanomaterials V, San Diego, CA, United States, 06/8/15. https://doi.org/10.1117/12.679894
Munakata T, Shibuta M, Mikamori M, Yamada T, Miyakubo K, Sugiyama T et al. One- And two-photon photo emission micro-spectroscopy for organic films. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6325. 2006. 63250M https://doi.org/10.1117/12.679894
Munakata, T. ; Shibuta, Masahiro ; Mikamori, M. ; Yamada, T. ; Miyakubo, K. ; Sugiyama, T. ; Sonoda, Y. / One- And two-photon photo emission micro-spectroscopy for organic films. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6325 2006.
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AB - We have constructed a laser-based microspot photoemission spectrometer which achieved lateral resolution of 0.3 μm and energy resolution of 30 meV. The light source at wavelength of 140 nm (photon energy of 8.86 eV) was generated as the 6-th harmonics of a titanium sapphire laser of 100 fs pulse duration. The high-energy resolution is the characteristics of our apparatus. The space-charge effect which affects the energy resolution and limits the sensitivity was described. The apparatus was applied to reveal spatial inhomogeneity of copper phthalocyanine films caused by intermolecular interaction and inter-layer interaction. We found that the highest occupied molecular orbital is peaking at the binding energies of 1.13, 1.23, and 1.38 eV depending on the film thickness and the sample positions. The peaks were assigned to originate from isolated molecules, ordered monolayer, and the second layer, respectively. The apparatus can also be operated as microspot two-photon photoemission spectrometer which probes unoccupied electronic states. A surface image due to the unoccupied first image potential state of Cu(111) facets showed that the lateral resolution for two photon photoemission with a light of 280 nm wavelength was 0.4 μm, smaller by 1/√2 than the diffraction limited spot size.

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