[en] A laser-induced partial oxidation of cyclohexane was studied in the liquid phase. With KrF excimer laser (248 nm) irradiation to neat liquid cyclohexane in which O₂ was dissolved, cyclohexanol and cyclohexanone were obtained with very high selectivities, together with cyclohexane as a minor product. Radical recombination reactions to produce dicyclohexyl ether and bicyclohexyl also took place, while these products were not observed in the gas phase reaction. These experimental results were considered to be due not only to higher concentration of cyclohexane but to the cage effect in the liquid phase oxidation. To clarify the reaction progress including the photoabsorption process, the effects of laser intensity and O₂ pressure on product distribution were studied. (author)

[en] Magnetooptical measurements have been performed on β''-(BEDT-TTF)(TCNQ) using the cavity perturbation techniques. β''-(BEDT-TTF)(TCNQ) has very exotic Fermi surface (FS). Several harmonic resonances were observed at various angles. We consider these resonances as q1D-periodic orbit resonance. The obtained Fermi velocity and the scattering time are 4.4x10⁴ m/s and 2.1x10^-11 s, respectively. When the magnetic field was rotated in the b^*a-plane, the similar resonances are observed. According to these results, the FS topology of the system at low temperature is discussed

[en] Magneto-optical measurements of a quasi-one-dimensional (q1D) organic superconductor (DMET)₂I₃ has been performed by using a cavity perturbation technique. Several resonant absorption lines, which can be attributed to the q1D periodic orbit resonance (q1D POR), as well as the quite unusual high-order q1D POR coming from the corrugated Fermi surface (FS) in the interlayer direction were observed. Moreover, other harmonic resonances are also observed when the AC electric field is applied along the c*-axis. We will also show its estimated q1D FS from the data analysis where the estimated FS clearly shows why there is no spin-density-wave or charge-density-wave transition in (DMET)₂I₃ despite having a q1D FS

No abstract available

[en] Using high frequency (up to 450 GHz) ESR and low-temperature specific heat measurements we find that insertion of 1% Fe and 2% Co damps spin-Peierls and Neel transitions and for T<30 K may give rise to onset of a quantum critical behaviour characteristic for a Griffiths phase

[en] ¹⁵⁵Gd was produced in the ¹⁵⁰Nd(¹²C,α3n) reaction at 65 MeV. A partial level scheme constructed from γ-γ coincidence measurements is shown, and rotational bands are labeled. The ground-state rotational band in ¹⁵⁶Gd is also presented

[en] Cu₂(C₅H₁₂N₂)₂Cl₄ (abbreviated as CHpC) is a new spin-gap system with a gap of about 10 K, which is proposed to be an S=((1)/(2)) ladder system. We performed the high-field ESR measurements down to 0.5 K using the ³He cryostat and the Vector Network Analyzer System in IMR. The measurements have been performed in V and W bands using the superconducting magnet up to 14 T, and we have observed the direct transition of CHpC below 0.9 K for the first time. Our results are discussed in connection with our previous high-field ESR results above 1.8 K using the pulsed magnetic field

No abstract available

No abstract available

[en] From high frequency (up to 450 GHz) ESR and low temperature specific heat measurements we find that insertion of 1% Fe and 2% Co in CuGeO₃ matrix smears both spin-Peierls and Neel transitions. For T<30 K we discovered an onset of the power asymptotics of magnetic susceptibility and specific heat characteristic to a quantum critical behaviour. (author)