Results 271 to 280 of about 34,135 (304)

Isotope Shifts in Some Lines of Nitrogen

Physical Review, 1943
The line spectrum of a mixture of approximately 70 atomic percent ${\mathrm{N}}^{15}$ to 30 atomic percent ${\mathrm{N}}^{14}$ was photographed with a Fabry-Perot interferometer. The source used was a liquid-air cooled quartz tube with external electrodes excited by a 12-meter oscillator. The tube was charged with helium at a few mm pressure containing
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Isotopic analysis of nitrogen

Journal of Applied Spectroscopy, 1970
N. G. Snopov, N. N. Bezlyudnyi
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Separation of Nitrogen Isotopes by Thermal Diffusion

Isotopenpraxis Isotopes in Environmental and Health Studies, 1968
The prototype of a thermal diffusion column for the use as basic unit in a N14N15 cascade is described. The hot wire separation column consists of a brass tube of effective length of 250 cm and inner diameter of 10 mm. Four columns are connected in series on a square cascade, the separation factors of which are compared with the values obtained by ...
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Origin of isotopically light nitrogen in meteorites

Geochemistry International, 2017
Bulk meteorite samples of various chemical classes and petrologic types (mainly carbonaceous chondrites) were systematically investigated by the stepped combustion method with the simultaneous isotopic analysis of carbon, nitrogen, and noble gases. A correlation was revealed between planetary noble gases associating with the Q phase and isotopically ...
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Nitrogen isotope signatures of oxidized nitrogen species from biomass burning

Applied Geochemistry, 2023
Wei Song, Xue-Yan Liu
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Isotopic composition of nitrogen in ‘phase-Q’

Earth and Planetary Science Letters, 1996
Abstract An acid residue from the Dhajala meteorite which carries the noble gas component of the pure Q-phase, has been analyzed for nitrogen and noble gases by step-wise heating pyrolysis. From Ne data we derive ( 20 22 ) Q = 10.48 ± 0.15 .
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Studies of Biological Nitrogen Fixation with Isotopic Nitrogen

Soil Science Society of America Journal, 1943
R. H. Burris, F. J. Eppling, H. B. Wahlin, P. W. Wilson   +3 more
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Boron-doped nitrogen-deficient carbon nitride-based Z-scheme heterostructures for photocatalytic overall water splitting

Nature Energy, 2021
Daming Zhao, Chung-Li Dong, Yu-Cheng Huang   +2 more
exaly  

Variation of nitrogen isotope fractionation during denitrification and nitrogen isotope balance in the ocean

Chemical Geology, 1988
Kon-Kee Liu, Isaac R. Kaplan
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The marine nitrogen cycle: new developments and global change

Nature Reviews Microbiology, 2022
David A Hutchins, Douglas G Capone
exaly