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Volume 34, Issue 8
Displaying 1-8 of 8 articles from this issue
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New Spectroscopy with Combinational Use of SR and Laser LightMasao KAMADA2006 Volume 34 Issue 8 Pages 536-537
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSDownload PDF (260K) -
Shin-ichi ADACHI, Shin-ya KOSHIHARA2006 Volume 34 Issue 8 Pages 538-543
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThe search for materials which exhibit phase transitions triggered by weak external excitation by light is animportant and attractive target for photonic and materials science. We review recent developments in ultra-fast X-ray diffraction techniques which are a result of a synergistic collaboration between researchers in the fieldsof photo-induced phase transition and synchrotron radiation. We review a study of electron (spin)-latticecoupled changes in the organic charge transfer complex TTF-CA.View full abstractDownload PDF (4776K) -
Kazutoshi TAKAHASHI, Junpei AZUMA, Masao KAMADA2006 Volume 34 Issue 8 Pages 544-548
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSPhotoemission spectroscopy using a combination of synchrotron radiation (SR) and a laser is fascinating since various laser-induced phenomena occurring on solids and surfaces are directly observable. A pump-probe technique using SR and a Ti: sapphire laser that is synchronized with the SR can provide time-resolved photoemission spectra in the nanosecond region. Using this system, we have studied the surface photo-voltage effects on an n-GaAs (100) surface. We have also constructed an experimental system that enables time-resolved photoemission spectroscopy in the microsecond region. Time-resolved photoemission spectra in the microsecond region can be obtained using a laser light from Ti: sapphire regenerative amplifier with a frequency of 10-300 kHz and a gate system with a time window in the range of 10 ns to 50 ms for the photoemission signal.View full abstractDownload PDF (1045K) -
Toru TSUJIBAYASHI2006 Volume 34 Issue 8 Pages 549-554
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThe accessibility of the two-photon spectroscopy to the forbidden states of the one-photon transition makes ita powerful tool. The two-photon excited core excitons were chosen as an example of a combinational use oflaser light and synchrotron radiation. The experiments were performed at Beamline 1B of UVSOR, Institutefor Molecular Science. The two light sources were synchronized at a repetition rate of 90 MHz. The singlephotoncounting method was used for detecting luminescence as the signal of two-photon absorption by thesample. The two-photon excitation spectrum of Auger-free luminescence from the BaF2 crystal exhibits severalpeaks due to core excitons. The analysis of the spectrum reveals the spin-orbit splitting and dispersion ofthe 4f and 6p states of the Ba ion in BaF2. The lifetime of the core exciton is obtained from the time-resolvedmeasurements.View full abstractDownload PDF (1182K) -
Hidekazu OKAMURA2006 Volume 34 Issue 8 Pages 555-559
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSSynchrotron radiation (SR) as an infrared (IR) source has several unique characteristics compared with the conventional infrared sources based on black-body radiation. When used with a microscope, an IR-SR beam can be focused to a nearly diffraction-limited spot size, which is very useful to IR studies of small samples. In addition, IR-SR is a pulsed and completely white source, which may enable time-resolved IR experiments over the entire IR region. These characteristics are also attractive for the study of photo-induced phenomena in condensed matter. This article reviews our recent studies of photo-induced phenomena using IR-SR at SPring-8.View full abstractDownload PDF (986K) -
Yoshihito TANAKA, Yujiro HAYASHI, Tetsuya ISHIKAWA2006 Volume 34 Issue 8 Pages 560-565
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSSignificant progress in recent developments of accelerator-based pulsed X-ray sources has offered the opportunity for time-resolved studies on fast structural dynamics on the atomic scale. The required and currently available techniques for time-resolved X-ray diffraction measurements using the third-generation synchrotron radiation sources are summarized. Ultrafast X-ray experimental techniques are discussed for femtosecond studies at future synchrotron radiation sources.View full abstractDownload PDF (1403K) -
Introduction to Storage Ring Free Electron Lasers and an Application Experiment at the UVSOR FacilityMasahito HOSAKA2006 Volume 34 Issue 8 Pages 566-569
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSA storage ring Free Electron Lasers (FEL) is a coherent light source that uses an electron beam circulating in a storage ring. It has unique properties such as a variable wavelength, good coherence and high power. One of the most important features of a storage ring FEL is its natural synchronization with a synchrotron radiation pulse. An application experiment of a storage ring FEL combined with synchrotron radiation was conducted at the UVSOR facility. This experiment demonstrates the relevance of the FEL in two color experiments.View full abstractDownload PDF (803K) -
Takahiro INOUE, Sho AMANO, Shuji MIYAMOTO, Takayasu MOCHIZUKI2006 Volume 34 Issue 8 Pages 570-574
Published: August 15, 2006
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThe stability of a continuously growing solid-Xe target (thickness 500 Em) on a rotating drum (diameter 17 cm, rotation speed 1000 rpm and up-down length 3 cm) chilled by liquid-N2 is investigated. The thermal load and the propagation process of a laser-induced shockwave in a solid-Xe target irradiated at a high-repetition rate and a high laser power are calculated theoretically. The thermal load is calculated to be approximately 0.7 W/cm2 for a pulse energy of 1 J, a repetition rate of 30 kHz and an average power of 30 kW. Under these conditions the solid-Xe target should be chilled to ≤ 84 K for it to attain thermal equilibrium. The target system has the ability to supply solid-Xe target sufficiently rapidly that foliation of the target due to an accumulation of shockwaves does not occur under these irradiation conditions, since the lifetimes of the shockwaves were estimated to be about 1 μs.View full abstractDownload PDF (880K)
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