Cross-sectional transmission electron microscopy (TEM) sample preparation of ZnSe/GaAs epitaxial films is investigated. Conventional argon ion milling is shown to produce a high density (approximately 5-8 x 10(11)/cm2) of small (diameter approximately 60-80 A) extended defects (stacking faults, microtwins, double positioning twins, etc.). In addition, transmission electron diffraction results i...

Catalytic reactions often require several types of sites with distinct functions, and the relative abundance of these sites influences the rate and selectivity of desired reactions. Heteropolyacid clusters with Keggin structures, which contain acid and redox functions, 2] have recently emerged as interesting catalysts for organic reactions involving bifunctional pathways. We recently discovered...

We present a detailed kinematical study and modeling of the emission of the molecular cores at ambient velocities surrounding IRAS 21391+5802, an intermediate-mass protostar embedded in IC 1396N. The high-density gas emission is found in association with three dense cores associated with the YSOs BIMA 1, BIMA 2, and BIMA 3. The CS (J=5→4) and CH3OH (J=5−1 →4−1) emission around BIMA 1 has been m...

Three structural isomers of the C2H4O2 molecule, namely, methyl formate (MF; HCOOCH3), acetic acid (AA; CH3COOH), and glycol aldehyde (GA; HOCH2CHO), have attracted considerable attention as targets for understanding pathways towards molecular complexity in interstellar medium (ISM). Among these isomers, MF is decisively abundant various astronomical objects. For formation MF, surface reactions...

Ti-silicates activate H2O2 to form Ti-hydroperoxo and Ti-peroxo intermediates that can react with alkenes epoxide products. Comparisons of kinetics for 1-octene epoxidation on Ti-BEA Ti-MFI catalysts different hydrophilicities in methanol (CH3OH) or acetonitrile (CH3CN) solvents show the significance solvent stabilizing catalytically-relevant species complex interdependencies between solvent, c...

Laboratory spectra have shown that CO2 is a powerful diagnostic tool for analyzing infrared data from remote observations, as it has been detected on icy moons in the outer Solar System as well as dust grain surfaces in the interstellar medium (ISM). IR absorption band profiles of CO2 within ice mixtures containing H2O and CH3OH change with respect to temperature and mixture ratios. In this par...

This work calculates the Lorentz–Lorenz coefficient with refractive index and density values of various molecules in their solid phase measured our laboratory under astrophysical conditions. was completed for a range temperatures from 13 K to close sublimation temperature each molecule. The studied were N2, CO2, NH3, CH4, CH3OH, C2H4, C2H6. For results match those found unique similar previous ...

In this work, new nanoporous silica (Korea Advanced Institute of Science and Technology-6 (KIT-6)-dried or KIT-6-calcined) incorporated with isolated Ti materials with different Si/Ti ratios (Si/Ti = 200, 100, and 50) has been synthesized and investigated to establish photocatalytic reduction of CO2 in the presence of H2O vapors. The properties of the materials have been characterized through N...

The appearance potentials (AP) of various ions, which are produced by field ionization at pla­ tinum tip emitters have been measured by a retarding potential energy analyzer coupled to the output of a single-focusing magnetic mass spectrometer. Adsorption layers of water and organic molecules on the emitter surface were found to have no significant influence on the AP measure­ ments. The APs of...