Edward Catalano

On the Infrared Spectrum of Hydrazine Matrix‐Isolation Studies of the System NH2NH2:N2 (I)

Matrix isolation spectra of the system NH2NH2:N2 were obtained in the region 4000–270 cm—1 at 4.2°K. Spectra taken in this manner are free of complications due to association, over‐all rotation, etc. The unusual features of these spectra are that the bands usually assigned to the bending modes which are present in gas‐phase spectra at ∼1500–1600 cm—1 are not found; and, that the torsional mode is apparently split. Anomalous behavior for the 6.3‐μ gas‐phase band was observed.

On the Infrared Spectrum of Hydrogen Peroxide Matrix‐Isolation Studies of the System H2O2:N2 (II)

Matrix‐isolation spectra of the system H2O2:N2 were obtained in the region 4000–300 cm—1 at 4.2°K. Spectra taken in this manner are free of complications due to association, over‐all rotation, etc. The most unusual feature of these spectra is the band system at 385 and 350 cm—1 in the torsional region. This main band at 385 cm—1 is exceedingly broad for a matrix spectrum. These bands have been assigned to the n=0→1 and 1→2 torsional transitions.

An enthalpic study of the thermal decomposition of unconfined triaminotrinitrobenzene

The thermal decomposition of triaminotrinitrobenzene (TATB) under unconfined conditions has been studied by isothermal calorimetric techniques using a differential scanning calorimeter (DSC) between 578 and 630 K. The decomposition is exothermic over the entire range. Between 615 < T < 630 K, the isothermal decomposition data indicates perhaps as many as five distinct reaction stages. Activation energies for each of the five steps are calculated by fitting the data to established solid state kinetic rate-laws.

Cerium-activated BaF2 and CaF2 scintillators☆

Abstract We report the development of a new inorganic-scintillator system based on Ce-activated BaF 2 and CaF 2 single crystals. Measurements made on small test samples indicate that larger crystals will be useful as charged-particle and gamma-ray detectors. The new scintillators have the advantage over previous systems of being non-hygroscopic.

Single-photon-absorption reaction chemistry in the solid state

A description of the technique of single‐photon‐absorption reaction chemistry in the solid state and preliminary results on four sets of reactants is presented.(AIP)

On the magnetic and chemical properties of europium fluoride

Abstract Electron spin resonance, chemical, and X-ray studies have been carried out on several different, nominally EuF 2 , single crystal samples. EuF 2 has been reported to be apparently antiferromagnetic. This study has shown the various samples to be paramagnetic down to 1.6°K. In some samples, however, magnetically ordered inclusions were observed in the paramagnetic host. Electron spin resonance at X-band frequencies indicated a transition at T N = 19.5° K . An observed uniaxial anisotropy and a direct dependence of the resonance field with frequency is compatible with the high frequency mode of an antiferromagnet. The most intense AFMR resonances were observed in samples which contained

A study of the thermal decomposition of confined triaminotrinitrobenzene. The gaseous products and kinetics of evolution

10 -5 mole ratio of the inclusions (average size

Infrared laser single photon absorption reaction chemistry in the solid state. I. The system SiH4–UF6 a)

0.5 × 20.0 × 20.0 μ ). Assuming an ordering of the second kind an exchange field H E = 4.84 × 10 4 Oe is calculated. The 〈 110 〉 directions of the host lattice appear to be the easy directions. For T ⪡ T N , (2H E H A ) 1 2 = 2510 Oe is observed. The magnetically ordered inclusions are apparently an oxyfluoride. The single crystal samples varied in stoichiometry between EuF 1.82 to EuF 2.39 with the lattice constant varying respectively from 5.838 A to 5.798 A. Details of the sample preparations are given.

Single-crystal growth of MF2 : UF4 : CeF3 (M = Ca, Sr, Ba) solid solutions

Abstract The thermal decomposition of confined triaminotrinitrobenzene (TATB) has been studied by observation of infrared matrix isolation spectra, mass spectra, and pressure-time response of the product gases. Solid state products were examined by infrared spectroscopy and scanning electron microscopy. Four distinct reaction regimes were found using the gaseous product data; a slow endothermic stage followed by two slow exothermic stages, and culminating in a deflagration (explosive) reaction above the critical temperature.

On the solid state products of the thermal decomposition of confined and unconfined triaminotrinitrobenzene

The reaction between SiH4 and UF6 under thermal gas phase and photon initiated conditions in cryogenic matrices has been investigated. The gas phase thermal reaction begins at 130–140° C producing HF, SiH3F, and a solid uranium fluoride product. When the UF6 is matrix isolated within SiH4 at 12 K and exposed to low power infrared radiation of 25 mW cm−2 using laser emissions resonant with the ν3 band of UF6, a reaction also occurs. This reaction produces SiH3F, UF5, and UF4 as products. The same reaction is also catalyzed using a broad band incoherent source with a photon flux density of 10 μW cm−2. The activation energy for the photoreaction (1.8 kcal mol−1) is considerably lower than the thermal activation barrier for the gas phase reaction. These experiments are part of the bases for uncovering a process of photochemistry of reactants in fixed relative configurations–single photon absorption reaction chemistry in the solid state (SPARCSS). This process is a manifestation of a previously unrecognized, g...