[en] New experimental results recently reported for matter radii of ^22,23O are significantly smaller than previous values. Our potential-model calculations agree with experiment for the entire chain from A=17 to 23, so that, within the experimental uncertainties, the data can be explained without considering any modification of the core. (orig.)

[en] We have updated the isotopically invariant Dunham fit of O₂ with newly reported literature transitions to derive (1) the energy levels, partition sums, band-by-band molecular constants, and RKR potentials for the X³Σ_g⁻, a¹Δ_g, and b¹Σ_g⁺ states of the six O₂ isotopologues: ¹⁶O¹⁶O, ¹⁶O¹⁷O, ¹⁶O¹⁸O, ¹⁷O¹⁷O, ¹⁷O¹⁸O, and ¹⁸O¹⁸O; (2) Franck-Condon factors for their a¹Δ_g−X³Σ_g⁻, b¹Σ_g⁺−X³Σ_g⁻, and a¹Δ_g−b¹Σ_g⁺ band systems. This new spectroscopic parameterization characterizes all known transitions within and between the X³Σ_g⁻, a¹Δ_g, and b¹Σ_g⁺ states within experimental uncertainty and can be used for accurate predictions of as yet unmeasured transitions. All of these results are necessary to provide a consistent linelist of all transitions which will be reported in a followup paper

[en] We study the radius and energies of oxygen isotopes towards the neutron drip-line. The abrupt increase of the radius at ²³O is investigated with two different approaches; the m-scheme cluster-orbital shell model (COSM) and a simplified model approach with the core plus one and two valence neutrons. We investigate properties of the oxygen isotopes by changing the radius of the ¹⁶O-core in the m-scheme COSM approach and obtain the result that the broad structure of ¹⁶O is favored in the ²³O and ²⁴O. In the simplified model approach, we estimate the magnitude of the change of the size of ²²O in ²³O and ²⁴O. (author)

[en] The delta¹⁸O and delta¹⁷O values of olivine from Kenna are 7.6 and 3.0 parts per thousand respectively, relative to SMOW. These values are typical of ureilites which form a unique group on a delta¹⁷O- delta¹⁸O graph. The ureilites are related to, but not directly derived from, the anhydrous phases of C2 and C3 meteorites. The ¹⁸O/¹⁶O fractionation between pyroxene and olivine is 0.60, indicating a temperature of last equilibration of 1000 +- 100⁰C. (author)

No abstract available

[en] The ¹⁸O/¹⁶O ratio under the m- and r-faces of smoky quartz has been measured; the ratio of the growth velocities was v_m/v_r=1/3. The obtained separation factor 1.00020 is compared with that obtained previously for amethyst (1.00043), where the ratio v_m/v_r was unity. (orig.)

[en] The concentration of ¹⁸O within well formed crystals of amethyst was found to vary beneath the different growth faces, increasing in the order z → r → m. The ¹⁸O/¹⁶O fractionation factor between the faces m and z was measured as 1.0007. (author)

[en] Measurements of the ¹⁴N¹⁵N/¹⁴N¹⁴N and ¹⁶O¹⁸O/¹⁶O¹⁶O Raman intensity ratios have been made in air samples and pure gas samples. A high-resolution double monochromator was used with a C31034A-02 PM tube to count the photons scattered from a low-powered laser beam (1--2 watts). Standard high-speed modular electronics (approximately 10 ns resolution) were used to process the output pulses. The ΔJ = 0 vibrational bands of ¹⁴N¹⁵N and ¹⁶O¹⁸O were observed to be essentially free of all interference except dark noise of approximately 3 counts/sec. The adjacent rotational structure of ¹⁴N¹⁴N and ¹⁶O¹⁶O showed no appreciable overlap with the ΔJ = 0 bands of interest. Detailed spectra, comparison of the Raman intensity ratios with mass spectrometer isotope ratios, and Raman cross section data for ¹⁴N¹⁵N and ¹⁶O¹⁸O are presented. The applicability of Raman scattering as a technique for precision measurement of isotope ratios is discussed

No abstract available

No abstract available