Fiber Raman laser pumped by a Nd:YAG laser

We have pumped a fiber Raman laser with a cw mode-locked Nd:YAG laser operating at 1319 nm and generated pulses as short as 160 fsec using soliton pulse shaping in the fiber. We have also constructed a completely integrated oscillator loop using a fiber optic coupler and fusion splicing.     

Clustering patterns in high-energy hadron collisions

The event-to-event fluctuations of the rapidity distributions are analyzed for semi-inclusive data obtained from 205 GeV/c and 303 GeV/c proton-proton collisions observed at NAL. The results indicate the presence of clustering effects, with cluster sizes approximating those observed in the quasi-elastic events. The average cluster size appears to be independent of the multiplicity of the final state.     

Determination of silicon in products and dust from a magnesite processing industry

INAA with 14 MeV neutrons is used for the determination of silicon in products of the magnesite plant and in the emitted dust. The products contain 1.3–1.7% Si. The average concentration in flue-dust is 2.5% Si.     

Long-range spin–spin interactions in the 13C-n.m.r. spectra of the nickel(II) complex of the Schiff base of (S)-N-benzylproline (2-benzoylphenyl)amide and glycine. Quantum-chemical calculations and possible donation of electron density from the π-system of the benzyl group to nickel

Long-range [ ⁿ J(¹³C, ¹³C), ⁿ J(¹⁵N, ¹⁵N) and ⁿ J(¹⁵N, ¹³C)] interactions in the ¹³C-n.m.r. spectra of CDCl₃ solutions of selectively labeled nickel(II) complexes of the Schiff base derived from (S)-N-benzylproline (2-benzoylphenyl)amide and glycine provide experimental evidence for the necessity of the donation of electron density from the -system of the benzyl ring to the nickel orbitals. No such interactions were observed in (²H)DMSO solutions, where the complex exists in a different conformation.     

Synthesis of highly symmetric mesomeric triazaphenalene betaines

The synthesis of seven mesomeric triazaphenalene betaines 4a‐g by condensation reaction of hexahydro‐2H‐pyrimido[1,2‐a]pyrimidine 1 with diethyl malonates 2a‐g or with bis(2,4,6‐trichlorophenyl)malonates 3c,f has been achieved. The guanidine 1 forms in benzene solution a salt with trimethyl methanetricarboxylate 5 which upon heating produces 4a.     

γ‐Alumina: a single‐crystal X‐ray diffraction study

The structure of γ‐alumina (Al_21+1/3□_2+2/3O₃₂) crystals obtained as a product of a corrosion reaction between β‐sialon and steel was refined in the space group Fdm. The oxygen sublattice is fully occupied. The refined occupancy parameters are 0.83 (3), 0.818 (13), 0.066 (14) and 0.044 (18) for Al ions in 8a, 16d, 16c and 48f positions, respectively. The Al ions are distributed over octa­hedral and tetra­hedral sites in a 63:37 ratio, with 6% of all Al ions occupying non‐spinel positions.     

Determination of the composition of hydrogenation products from nitrogenous heterocyclic compounds by gas chromatography-mass spectrometry

Summary The composition of the products of high-pressure hydrogenation on MoS₂ catalyst of heterocyclic compounds (pyridine, quinoline, isoquinoline, 2-methylpyrrole) belonging to the types of compounds currently occurring in the fractions of petroleum and in similar products was determined by GC-MS. The change of composition of these products with different temperatures was investigated.

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Bestimmung der Zusammensetzung der Hydrierungsprodukte heterocyclischer Stickstoffverbindungen durch GC-MS

Zusammenfassung Die Zusammensetzung der Produkte der Hochdruckhydrierung (MoS₂-Katalysator) heterocyclischer Stickstoffverbindungen (Pyridin, Chinolin, Isochinolin, 2-Methylpyrrol), wie sie in Erdölfraktionen und ähnlichen Erzeugnissen vorkommen, wurde untersucht und diskutiert. Änderungen der Zusammensetzung in Abhängigkeit von der Temperatur wurden ebenfalls berücksichtigt.