Spectrochimrco Ac;a, Vol 416. No. 6, pp. t-iii. 1986.

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NEW PATENTS

This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@’ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH’a’ can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A.

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4341470

ATOMIC ABSORPTION SPECTROSCOPY

Clive Parker, Antony Pearl, Mount Waverfy, Australia assigned to Varian Associates Inc

A method and apparatus for carrying out atomic spectroscopy, and particularly atomic absorption and atomic fluorescence spectro- scopy. The method involves passing the emission spectrum of a light source through an atomized sample, changing the relationship between a selected emission line of the emission spectrum and a corresponding absorption line of the atoms of interest and measuring the absorption of that emission line by the sample before and af- ter the aforementioned change in relationship. The change in emission and absorption line rela- tionship can be effected by application of the Zeeman Effect, Stark Effect, or Doppler Effect. The apparatus, in one form, includes an electro- magnet operative to apply a magnetic field to the atomized sample and thereby cause splitting and shifting of the aforementioned absorption line, and the magnet is modulated to effect periodic variation of the spectral line relationship.

4554060

PHOTOLYTIC SEPARATION OF ISOTOPES IN CRYOGENIC

SOLUTION

Samuel Freund, William B Maier, Redus F Hol- land, Willard H Beattie assigned to The United States of America as represented by the United States Department of Energy

Separation of carbon isotopes by photolysis of (752 in cryogenic solutions of nitrogen, krypton

i

and argon with 206 nm light from an iodine resonance lamp is reported. The spectral dist- ribution of the ultraviolet absorption depends on solvent. Thus, in liquid nitrogen the photolytic decomposition rate of 13CS2 is greater than’that of 12CS2 (because the absorption of 206 nm radiation is greater for 13CS2), whereas in liquid krypton and liquid argon the reverse is true. The shift in ultraviolet spectrum is a general phenomenon readily characterized as a function of solvent polarizability, and exhibits behavior similar to that for vibrational transitions occur- ring in the infrared.

4555176

METHOD AND APPARATUS FOR DETERMINING PRESSURE-

INDUCED FREQUENCY-SHINS IN SHOCK-COMPRESSED

MATERIALS

David S Moore, Stephen C Schmidt assigned to The United States of America as ,represented by the United States Department of Energy

A method and an apparatus for cgnducting coherent anti-Stokes Raman scattering spectro- scopy in shock-compressed materials are dis- closed. The apparatus includes a sample vessel