H. Kimura

Infrared spectromicroscopy and magneto-optical imaging stations at SPring-8

Abstract At the BL43IR of SPring-8, infrared microanalysis on various kinds of solid specimens under multiple environments with a spatial resolution smaller than 10xa0μm in diameter is planned in the infrared region. In order to perform such analysis, two different stations, a multipurpose spectromicroscopy apparatus and a magneto-optical imaging one have been constructed. Measurements on the spatial two-dimensional cross-section of the infrared beam at the spectromicroscopy station have proven that the stations have a good prospective feature in the performance.

Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption

Infrared absorption spectra of SrTiO 3 have been measured under above-band-gap photoexcitations to study the properties of photogenerated carriers, which should play important roles in previously reported photoinduced phenomena in SrTiO 3 . A broad absorption band appears over the entire mid-infrared region under photoexcitation, which is attributed to absorption by the photogenerated carriers occupying in-gap states. The photoinduced absorption is strongly dependent on temperature even below 35 K, where the average photocarrier density is nearly constant. The data show that the density of in-gap states occupied by the photocarriers is high and distributed over a wide energy range extending to the band edges.

Infrared beamline BL43IR at SPring-8: design and commissioning

Abstract The beamline BL43IR at SPring-8 has been constructed as a beamline exclusively dedicated to the infrared spectroscopy. The beamline was designed to make use of infrared synchrotron radiation emitted from a bending magnet of 39.3xa0m bending radius with the acceptance angle of 36.5( H )×12.6( V )xa0mrad 2 and to cover a very wide wavelength range from 500xa0nm (20,000xa0cm −1 , 2.5xa0eV) to 100xa0μm (100xa0cm −1 , 12.5xa0meV). A Fourier transform interferometer and four experimental stations were installed to utilize the infrared synchrotron radiation at SPring-8.

Front end and optics of infrared beamline at SPring-8

Abstract An infrared (IR) beamline, BL43IR, at SPring-8 has been constructed for IR spectroscopies under extreme conditions. The beamline covers a very wide photon energy range in the IR region and offers a brilliant IR photon beam to the experimental end stations. The IR light from SPring-8 is collected by a newly designed optical system including a so-called “magic mirror”. The design of the optical system and the obtained results are reported.

Infrared study of spin crossover Fe-picolylamine complex

Infrared (IR) absorption spectroscopy has been used to probe the evolution of microscopic vibrational states upon the temperature- and photo-induced spin crossovers in [Fe(2-picolylamine) 3 ]Cl 2 EtOH (Fe–pic). To overcome the small sizes and the strong IR absorption of the single crystal samples used, an IR synchrotron radiation source and an IR microscope have been used. The obtained IR spectra of Fe–pic show large changes between high-spin and low-spin states, for both the temperature- and the photo-induced spin crossovers. In contrast, the spectra in the temperature- and photo-induced high-spin states are relatively similar to each other, however they show distinct differences below 750 cm -1 . This demonstrates that the photo-induced high-spin state involves microscopically different characters from those of the temperature-induced high-spin state. The results are discussed in terms of local pressure and structural deformations within the picolylamine ligands, and in terms of their possible relevance...

Photoinduced spin crossover in a Fe-picolylamine complex : A far-infrared study on single crystals

Far-infrared spectroscopy has been performed on

Infrared experiments under laser excitations at SPring-8

[mathrm{Fe}{(2text{ensuremath{-}}text{picolylamine})}_{3}]{mathrm{Cl}}_{2}mathrm{EtOH}

Infrared spectroscopy under extreme conditions

(Fe-pic) single crystals to probe changes in the molecular vibrations upon the photoinduced and temperature-induced spin crossovers. Synchrotron radiation has been used as the far-infrared source to overcome the strong absorption and the small sizes of the samples. Absorption lines due to

Surface science station of the infrared beamline at SPring-8

{mathrm{FeN}}_{6}

High-pressure phase transition and behavior of protons in brucite Mg(OH)2: a high-pressure–temperature study using IR synchrotron radiation

cluster vibrations, observed below