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

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Fmgamon Journals Ltd.

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

ii New Patents

having an optically transparent wall and an op- posing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sam- ple of a coherent anti-Stokes beam, which is em- itted toward the approaching reflective wall of the vessel and reflected back through the win- dow. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chem- ical and physical phenomena which occur during the shock-compression of the sample.

4556315

PROCESS AND APPARATUS FOR THE EMISSION-

SPECTROSCOPICAL TESTING OF METALLIC SAMPLES

Wilhelm Berstermann, Georgsmarienh Federal Republic Of Germana assigned to Klockner- Werke Aktiengesellschaft

During the emission-spectroscopical testing of metallic samples by means of unipolar dis- charges, material is precipitated onto the coun- terelectrode material which leads to faulty test results. According to the invention, at the start of the pre-spark period half waves of the unipolar discharge are replaced by oscillating discharges,

wherein two parallel-connected discharge capacitors and two series-connected discharge resistors, one discharge capacitor and one dis- charge resistor can be shunted and the shunting is canceled out after a prespecified period of time, starting with the pre-spark period.

4556847

METHOD OF QUANTITATIVE ANALYSIS OF SUBSTANCES AND

NUCLEAR-RESONANT QUANTIT&/Wr;F;;ALYZER

Evgeny K Aspiotis, Boris Y Vitjuk, Evgeny I Malakhov, Boris Danshin, Vladimir A Sokolov, Anatoly S Sidorov, Leonid Volkov, Krasnodar, Union Of Soviet Socialist Republics assigned to Vsesojuzny Nauchno-Issledovatelsky Institut Maslichnykh Kultur Imeni V S Pustovoita

A method of quantitative analysis of substances based on nuclear magnetic resonance comprises the steps of weighing a sample of substance to be analyzed, obtaining therefrom and ac- cumulating nuclear magnetic resonance signals during n measuring cycles, computing a mean value of the nuclear magnetic resonance signals, and determining percentage of components in the sample being analyzed with regard to its mass and the mean value of the nuclear magnetic resonance signals. The mean value of the ac- cumulated signals and its standard deviation are computed as the accumulation occurs during each of the n measuring cycles, the subsequent step being subtraction of the standard deviation from the permissible limiting standard deviation value whereupon the accumulation is stopped during the nith cycle in which a difference bet- ween said magnitudes is a positive value. A nuclear-resonant quantitative analyzer for ac- complishing the aforesaid method comprises a magnetic system, a nuclear magnetic resonance signal pick-up arranged in its gap, an amplifier, a