Low Temperature

... Chem. SOC. 1985,107, 8296. (5) (a) Crabtree, RH; Dion, RP J. Chem. SOC., Chem. Commun. 1984, 1260. (b) Werner, R; Werner, H. Chem. Ber. 1984, 117, 161. (c) Derome, AE; Green, MLH; OHare, DJ Chem. SOC., Dalton Trans. 1986, 343. (d) Bleeke, J. R.; Moore, D. A. Inorg. ...

... Chem. SOC. 1985,107, 8296. (5) (a) Crabtree, RH; Dion, RP J. Chem. SOC., Chem. Commun. 1984, 1260. (b) Werner, R; Werner, H. Chem. Ber. 1984, 117, 161. (c) Derome, AE; Green, MLH; OHare, DJ Chem. SOC., Dalton Trans. 1986, 343. (d) Bleeke, J. R.; Moore, D. A. Inorg. ...

... Permissions & Reprints. Dissolved potassium in the shallow groundwaters circulating in the volcanic rocks of central-southern Italy. Barbara Gambardella a , Luigi Marini a , Corresponding Author Contact Information , E-mail The Corresponding Author and Ilaria Baneschi b. ...

The nonlinearity of a mercury cadmium telluride photoconductive detector, an integral part of a modified commercial interferometer used for airborne research, has been analyzed and evaluated against a number of correction schemes. A high-quality blackbody with accurate temperature control has been used as a stable and well-characterized radiation source. The detector nonlinearity was established as a function of scene temperature between 194 and 263 K. Second- and third-order corrections to the measured interferogram have been tested by analyzing the measured signal both within and outside the spectral response region of the detector. A combined correction scheme is proposed that best represents the real nonlinear response of the detector.

The role played by the ion beam in the depolymerization of poly(methyl methacrylate) (PMMA) is the creation of initiators for the unzipping reaction at relatively low temperatures [lower than the ceiling temperature of PMMA (TC=220 °C)]. Monomer (MMA) evolution out of the polymeric film is thus governed by the kinetics of the chemical reaction and also by the diffusion of monomer inside the polymeric film. In this work this phenomenon has been described by using simple models in which both one- and two-dimension monomer diffusion is considered. Exact analytical solutions of the models are provided. The theory fit well the experimental data and allows for the determination of important parameters such as the kinetics constant of the depolymerization and the monomer diffusion coefficient, D, inside the polymer film. Thus, the pulsed ion beam technique, here modeled, is useful not only for extracting D values of slow diffusants in polymers, but even for measuring kinetics constants of depolymerization at a temperature well below that needed for the formation of suitable thermal initiators.

Raman scattering (RS), photoluminescence (PL), optical reflectance spectra, AFM, SEM, XPS have been measured to study porous films of GaAs, obtained by electrochemical etching in HF:H2O or HF:C2H5OH:H2O electrolyte. The two-layer structure was found to have the size of pores in the range of 0.2–1.0μm, and to contain Ga2O3, As2O3 as well as other oxides and GaAs nanocrystals. The intensity

Comprehensive optical characterization of C60 films on semiconductor substrates has been performed by means of ellipsometry, Raman and photoluminescence spectroscopy. The films have been prepared by the sublimation of C60 in vacuum. The morphology of these films and the C60–substrate interaction were investigated by atomic force microscopy. Both flat and patterned wafers of Si, Ge, and InP have been used