Photo-induced structural changes at a surface of organic single crystals observed by vibrational sum frequency generation spectroscopy

K. Fukumoto, N. Fukazawa, T. Ishikawa, S. Koshihara, H. M. Yamamoto, R. Kato, K. Onda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Phase transitions from insulator to metal induced by thermal excitation and by photo-irradiation at the surface of β′-(BEDT-TTF)(TCNQ) are investigated using vibrational sum frequency generation spectroscopy. The results are compared with linear reflectivity measurements which detect the information mainly from bulk. IR absorption spectra of ag vibrational modes of TCNQ induced by the dimerization are observed using vibrational sum frequency generation spectroscopy, and its intensity is found to become smaller by thermal excitation indicating the transition to the metal phase. Time-dependent degree of dimerization is also observed by pump-probe experiments with almost the same statistics as the static measurements. On the other hand, in the reflectivity experiments, the reduction of dimerization is also observed by elevating the temperature, however, the spectral shapes are deformed for the time-resolved measurements. These results imply that the different dynamics occur at the surface and in the bulk.

Original languageEnglish
Pages (from-to)313-315
Number of pages3
JournalActa Physica Polonica A
Volume121
Issue number2
DOIs
Publication statusPublished - Feb 2012
Externally publishedYes

Fingerprint

dimerization
single crystals
spectroscopy
reflectance
metals
excitation
vibration mode
time measurement
statistics
insulators
pumps
absorption spectra
irradiation
probes
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Photo-induced structural changes at a surface of organic single crystals observed by vibrational sum frequency generation spectroscopy. / Fukumoto, K.; Fukazawa, N.; Ishikawa, T.; Koshihara, S.; Yamamoto, H. M.; Kato, R.; Onda, K.

In: Acta Physica Polonica A, Vol. 121, No. 2, 02.2012, p. 313-315.

Research output: Contribution to journalArticle

Fukumoto, K. ; Fukazawa, N. ; Ishikawa, T. ; Koshihara, S. ; Yamamoto, H. M. ; Kato, R. ; Onda, K. / Photo-induced structural changes at a surface of organic single crystals observed by vibrational sum frequency generation spectroscopy. In: Acta Physica Polonica A. 2012 ; Vol. 121, No. 2. pp. 313-315.
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AU - Kato, R.

AU - Onda, K.

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