The isotopic composition and atomic weight of titanium

Shima, Masako; Torigoye, Noriko

doi:10.1016/0168-1176(93)87051-s

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…size that the isotopic composition of titanium is relatively poorly known [29]. For example, using 49 To summarize, from our data alone we cannot prove that the terrestrial 50 Ti/ 47 Ti ratio used recently is incorrect by 13ε, but the excess observed by us is most probably not due to an experimental artefact.…”

Section: The Titanium Isotope Composition Of Standard Solutionscontrasting

confidence: 49%

High precision titanium isotope measurements on geological samples by high resolution MC-ICPMS

Leya

Schönbächler

Wiechert

et al. 2007

International Journal of Mass Spectrometry

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Section: The Titanium Isotope Composition Of Standard Solutionscontrasting

confidence: 49%

High precision titanium isotope measurements on geological samples by high resolution MC-ICPMS

Leya

Schönbächler

Wiechert

et al. 2007

International Journal of Mass Spectrometry

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“…Titanium is an abundant, widely distributed element, yet it was the element with the most uncertain atomic weight with U[A r (Ti)]/A r (Ti) = 626 × 10 -6 . This situation changed in 1993 [16] when CAWIA acknowledged the work of Shima and Torigoye [134] by accepting their "calibrated" measurement value of 47.867(1). Titanium has undergone (since 1979), the largest relative change in standard atomic-weight value recommended by CAWIA during the past 25 years.…”

Section: N(mentioning

confidence: 99%

Atomic weights of the elements. Review 2000 (IUPAC Technical Report)

Laeter¹,

Böhlke²,

Bièvre³

et al. 2003

Pure and Applied Chemistry

915

554

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgmentAbstract: A consistent set of internationally accepted atomic weights has long been an essential aim of the scientific community because of the relevance of these values to science and technology, as well as to trade and commerce subject to ethical, legal, and international standards. The standard atomic weights of the elements are regularly evaluated, recommended, and published in updated tables by the Commission on Atomic Weights and Isotopic Abundances (CAWIA) of the International Union of Pure and Applied Chemistry (IUPAC). These values are invariably associated with carefully evaluated uncertainties. Atomic weights were originally determined by mass ratio measurements coupled with an understanding of chemical stoichiometry, but are now based almost exclusively on knowledge of the isotopic composition (derived from isotope-abundance ratio measurements) and the atomic masses of the isotopes of the elements. Atomic weights and atomic masses are now scaled to a numerical value of exactly 12 for the mass of the carbon isotope of mass number 12. Technological advances in mass spectrometry and nuclear-reaction energies have enabled atomic masses to be determined with a relative uncertainty of better than 1 × 10 -7 . Isotope abundances for an increasing number of elements can be measured to better than 1 × 10 -3 . The excellent precision of such measurements led to the discovery that many elements, in different specimens, display significant variations in their isotope-abundance ratios, caused by a variety of natural and industrial physicochemical processes. While such variations increasingly place a constraint on the uncertainties with which some standard atomic weights can be stated, they provide numerous opportunities for investigating a range of important phenomena in physical, chemical, cosmological, biological, and industrial processes. This review reflects the current and increasing interest of science in the measured differences between source-specific and even sample-specific atomic weights. These relative comparisons can often be made with a smaller uncertainty than is achieved in the best calibrated "absolute" (= SI-traceable) atomic-weight determinations. Accurate determinations of the atomic weights of certain elements also influence the values of fundamental constants such as the Avogadro, Faraday, and universal gas constants. This review is in two parts: the first summarizes the development of the science of atomic-weight determinations during the 20 th century; the second summarizes the changes and variations that have been recognized in the values and uncertainties of atomic weights, on an element-by-element basis, in the latter part of the 20 th century.J. R. de LAETER et al.

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“…We measured 132 ground-state rotational absorption transitions of TiO in natural abundance [38,39] and assigned 14 lines to the main isotopologue 48 TiO 1 (73.72%) and 13 lines to each of the less abundant 1 If not otherwise stated O refers to the 16 O isotope.…”

Section: Measurements and Data Reductionmentioning

confidence: 99%

Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide – TiO

Breier

Waßmuth

Fuchs

et al. 2019

Journal of Molecular Spectroscopy

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More than 130 pure rotational transitions of 46 TiO, 47 TiO, 48 TiO, 49 TiO, 50 TiO, and 48 Ti 18 O are recorded using a high-resolution mm-wave supersonic jet spectrometer in combination with a laser ablation source. For the first time a mass-independent Dunham-like analysis is performed encompassing rare titanium monoxide isotopologues, and are compared to results from high-accuracy quantum-chemical calculations. The obtained parametrization reveals for titanium monoxide effects due to deviations from the Born-Oppenheimer approximation. Additionally, the dominant titanium properties enable an insight into the electronic structure of TiO by analyzing its hyperfine interactions. Further, based on the mass-independent analysis, the frequency positions of the pure rotational transitions of the short lived rare isotopologue 44 TiO are predicted with high accuracy, i.e., on a sub-MHz uncertainty level. This allows for dedicated radio-astronomical searches of this species in core-collapse environments of supernovae.

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The isotopic composition and atomic weight of titanium

Cited by 14 publications

References 16 publications

High precision titanium isotope measurements on geological samples by high resolution MC-ICPMS

High precision titanium isotope measurements on geological samples by high resolution MC-ICPMS

Atomic weights of the elements. Review 2000 (IUPAC Technical Report)

Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide – TiO

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