Zobrazeno 1 - 10
of 27
pro vyhledávání: '"H.S. McKown"'
Publikováno v:
International Journal of Mass Spectrometry and Ion Processes. 97:227-236
Initial studies have been performed to investigate the use of positrons to ionize polyatomic molecules for mass spectrometric analysis. A positron beam facility has been constructed which converts forward-scattered gamma radiation from a 150-MeV acce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a884d770b2a090e9432a6d4bc906997a
https://doi.org/10.1016/0168-1176(90)85001-i
https://doi.org/10.1016/0168-1176(90)85001-i
Autor:
H.S. McKown, D.H. Smith
This TM is one of a pair that describes ORNL-developed software for acquisition and processing of isotope ratio mass spectral data. This TM is directed at the laboratory analyst. No technical knowledge of the programs and programming is required. It
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef44da947163cec8c6d932cab4170e79
https://doi.org/10.2172/10194933
https://doi.org/10.2172/10194933
Publikováno v:
International Journal of Mass Spectrometry and Ion Physics. 51:39-46
A new ion source has been designed and tested for performing thermal ionization isotopic analyses with a quadrupole mass spectrometer. Significantly improved performance in comparison to the commercial source was obtained.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f6f2d584f6c9e72c3afdd29d95f779a
https://doi.org/10.1016/0020-7381(83)85027-x
https://doi.org/10.1016/0020-7381(83)85027-x
Publikováno v:
Analytica Chimica Acta. 142:355-359
A modified quadrupole mass spectrometer is housed in a van that serves as a mobile laboratory to provide on-site determinations of isotopic ratios and concentrations of uranium and plutonium. Each element can be determined at 1–3 ng levels with pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0b4afe851c0a00d9dde20b1ed7a8834
https://doi.org/10.1016/s0003-2670(01)95304-8
https://doi.org/10.1016/s0003-2670(01)95304-8
Publikováno v:
International Journal of Mass Spectrometry and Ion Physics. 42:183-190
An ion source with circularly-symmetric lens elements has been designed and evaluated using a single-filament, thermal-ionization mass spectrometer. Both uranium and plutonium samples have been analyzed. The new fource yields better ion transmission
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e397b091dff1d6fda01ab257b6016990
https://doi.org/10.1016/0020-7381(82)80063-6
https://doi.org/10.1016/0020-7381(82)80063-6
Publikováno v:
Instrumentation Science & Technology. 16:191-206
This paper describes the use of a time-of-flight mass spectrometer as the second stage of a MS/MS instrument. This system has been improved by the addition of a newly designed data acquisition system. The performance of this instrument will be discus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fbc237e569a18407c95b76b4d5d19b8
https://doi.org/10.1080/10739148708543635
https://doi.org/10.1080/10739148708543635
Publikováno v:
Applied Spectroscopy. 42:1057-1061
Many single-color, multiple-photon transitions leading to ionization are observed for lanthanide and actinide elements in experiments using resonance ionization mass spectrometry (RIMS). It is desirable both to identify the energy levels involved in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ad9ec605520d14fe37a10f77e639ecf
https://doi.org/10.1366/0003702884430461
https://doi.org/10.1366/0003702884430461
Publikováno v:
International Journal of Mass Spectrometry and Ion Physics. 10:343-351
A three-stage mass spectrometer has been constructed consisting of two magnetic stages of 30-cm radius followed by an electrostatic analyzer with a radius of 43.25 cm. The instrument gives an abundance sensitivity of better than 1 × 107 and is used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::531857c107509ee02fb722a93d717eef
https://doi.org/10.1016/0020-7381(73)83011-6
https://doi.org/10.1016/0020-7381(73)83011-6
Publikováno v:
Science. 216:296-298
An innovative ultrasensitive technique was used for lead isotopic analysis of individual zircons extracted from granite core samples at depths of 960, 2170, 2900, 3930, and 4310 meters. The results show that lead, a relatively mobile element compared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0aa9ac093155c5c84259a7b4c22f321d
https://doi.org/10.1126/science.216.4543.296
https://doi.org/10.1126/science.216.4543.296
Progress on investigations to improve precision on mass spectrometric isotopic ratio measurements is reported. A detailed set of intructions as submitted to ASTM Committee C-26.05 on the rapid preparation and analysis of uranium and plutonium samples
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98c6c0b5c9f44c9ce0ded6ca440493d8
https://doi.org/10.2172/6469639
https://doi.org/10.2172/6469639