Results 211 to 220 of about 109,535 (265)

Optical isotope ratio spectroscopy – complementing isotope ratio mass spectrometry

OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), 2021
Isotope ratio measurements and scale definitions are typically related to mass specectroscopy. This work discusses the challenges of optical isotope ratio spectroscopy and its prospects to significantly complement isotope ratio mass spectrometry.
Braden-Behrens, Jelka, Meuzelaar, Heleen, Mohn, Joachim, Nwaboh, Javis A., Persijn, Stefan, Rolle, Francesca, Sega, Michela, Steur, Pharahilda M., Wacker, Lars, Zeyer, Kerstin, Werhahn, Olav, Ebert, Volker   +11 more
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Reconstructing bulk isotope ratios from compound‐specific isotope ratios

Rapid Communications in Mass Spectrometry, 2010
Abstract Carbon isotope analysis by bulk elemental analysis coupled with isotope ratio mass spectrometry has been the mainstay of δ 13 C analyses both at natural abundance and in tracer studies. More recently, compound‐specific isotope analysis (CSIA) has
Douglas J, Morrison, Karen, Cooper, Tom, Preston   +2 more
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Isotope ratios in photosynthetic oxygen

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1979
Axenic suspensions of the fresh water green alga Ankistrodesmus braunii were illuminated under aerobic conditions. The released gas mixture was introduced into the ion source of an isotope mass spectrometer, which recorded the 18O/16O ratio.
H, Metzner, K, Fischer, O, Bazlen
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Isotope ratio mass spectrometry

The Analyst, 2009
Isotope Ratio Mass Spectrometry (IRMS) is a specialized technique used to provide information about the geographic, chemical, and biological origins of substances. The ability to determine the source of an organic substance stems from the relative isotopic abundances of the elements which comprise the material.
Zeland, Muccio, Glen P, Jackson
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Isotopic ratios in planetary atmospheres

Advances in Space Research, 1995
Recent progress on measurements of isotopic ratios in planetary or satellite atmospheres include measurements of the D/H ratio in the methane of Uranus, Neptune and Titan and in the water of Mars and Venus. Implications of these measurements on our understanding of the formation and evolution of the planets and satellite are discussed.
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Ratio of in zirconium isotopes

Canadian Journal of Physics, 1976
The modified random phase approximation is applied for studying pairing vibrations in Zr isotopes. The ratio of [Formula: see text], which is related to the ratio of the square of the two-nucleon transition amplitude, is calculated for different zirconium isotopes and compared with the experimental result.
M. K. Ghosh, S. R. Majumdar, B.C. Samanta   +2 more
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Isotope‐ratio detection for gas chromatography

Journal of Separation Science, 2006
AbstractInstrumentation and methods exist for highly precise analyses of the stable‐isotopic composition of organic compounds separated by GC. The general approach combines a conventional GC, a chemical reaction interface, and a specialized isotope‐ratio mass spectrometer (IRMS).
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Plutonium isotope ratios in polychaete worms

Nature, 1976
WE have noted with interest recent reports which suggest a preferential biological availability of 238Pu over 239+240Pu in terrestrial and aquatic organisms1–4. Although kinetic isotope effects do occur in biological systems for low mass number elements (H, C, N), such effects are generally discounted as the mass number of the element increases.
T M, Beasley, S W, Fowler
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Anomalous Nitrogen Isotope Ratio in Comets

Science, 2003
High-resolution spectra of the CN B 2 ∑ + – X 2 ∑ + (0,0) band at 390 nanometers yield isotopic ratios for comets C/1995 O1 (Hale-Bopp) and C/2000 WM1 (LINEAR) as follows: 165 ± 40 and 115 ± 20 for 12
Arpigny, Claude, Jehin, Emmanuel, Manfroid, Jean, Hutsemekers, Damien, Schulz, Rita, Stüwe, J. A., Zucconi, Jean-Marc, Ilyin, Ilya   +7 more
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Isotope ratio determination in boron analysis

Biological Trace Element Research, 1998
Traditionally, boron (B) isotope ratios have been determined using thermal ionization mass spectrometry (TIMS) and, to some extent, secondary ion mass spectrometry (SIMS). Both TIMS and SIMS use a high-resolution mass analyzer, but differ in analyte ionization methods.
R N, Sah, P H, Brown
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