Results 301 to 310 of about 2,297,493 (345)
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Ultrasonic spectrum of adrenal masses
Urology, 1979Adrenal masses are amenable to ultrasonic examination. The ultrasonic characteristics of eight adrenal masses in 6 patients are described. In particular, an ultrasonic study of the natural history and progression of a large adrenal adenoma is reported.
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Canadian Journal of Physics, 1981
The charmonium mass spectrum is evaluated using the oscillator potential as responsible for long range confinement. Hyperfine splittings for the color singlet [Formula: see text] system are discussed using various approaches. The mass of [Formula: see text] and [Formula: see text] are also briefly touched upon.
Sajjad Mahmood, M. M. Ilyas
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The charmonium mass spectrum is evaluated using the oscillator potential as responsible for long range confinement. Hyperfine splittings for the color singlet [Formula: see text] system are discussed using various approaches. The mass of [Formula: see text] and [Formula: see text] are also briefly touched upon.
Sajjad Mahmood, M. M. Ilyas
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The mass spectrum of trimethylboroxine
Journal of Inorganic and Nuclear Chemistry, 1961Abstract Comparison of the mass spectra of isotopically normal and 10B-enriched trimethylboroxines makes possible the identification of the various fragments. The spectra furnish independent substantiation of the molecular weight and structure of (CH3)3B3O3—a ring with considerable aromatic character. The 10 B 11 B isotopic abundance
W.J. Lehmann, C.O. Wilson, I. Shapiro
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Organic Mass Spectrometry, 1981
AbstractIrreproducibilities in the measurements of isotopic abundance in 15N labelled glycine have been related to the complex nature of chemical processes occurring during the evaporation of glycine prior to ionization.
J. R. Majer +2 more
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AbstractIrreproducibilities in the measurements of isotopic abundance in 15N labelled glycine have been related to the complex nature of chemical processes occurring during the evaporation of glycine prior to ionization.
J. R. Majer +2 more
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1996
FORMATION OF IONS A mass spectrometer works with electrically charged particles and, before a mass spectrum can be obtained, the substance under examination must be ionized if it is not already ionic. Most research into mass spectrometry has been carried out on positive ions and these are discussed in detail.
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FORMATION OF IONS A mass spectrometer works with electrically charged particles and, before a mass spectrum can be obtained, the substance under examination must be ionized if it is not already ionic. Most research into mass spectrometry has been carried out on positive ions and these are discussed in detail.
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Journal of Chemical Education, 1989
The concepts of isotopic abundance, mass defect, fragmentation, and nuclear binding energies are all illustrated in the readily interpretable spectrum of a nonorganic material.
Gerald Dudek, Emily P. Dudek
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The concepts of isotopic abundance, mass defect, fragmentation, and nuclear binding energies are all illustrated in the readily interpretable spectrum of a nonorganic material.
Gerald Dudek, Emily P. Dudek
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The mass spectrum of mevalonolactone
Organic Mass Spectrometry, 1974AbstractThe principal fragmentation pathways of mevalonolactone are initiated by cleavage α to the hydroxyl function. Each major route has been delineated by using isotopic labelling and metastable analysis. A knowledge of this fragmentation pattern is useful for the calculation of isotopic purity and specificity in samples of mevalonolactone used as ...
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International Journal of Mass Spectrometry and Ion Physics, 1970
Abstract The charge exchange mass spectrum of NO2 has been studied in a tandem mass spectrometer. The agreement with photon impact and electron impact mass spectra proves that at least the fragmentation process giving NO+ takes place from a molecule-ion that has been formed directly without autoionization processes.
E. Lindholm, G. Sahlström
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Abstract The charge exchange mass spectrum of NO2 has been studied in a tandem mass spectrometer. The agreement with photon impact and electron impact mass spectra proves that at least the fragmentation process giving NO+ takes place from a molecule-ion that has been formed directly without autoionization processes.
E. Lindholm, G. Sahlström
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Mass spectrum of tetrabutyltin
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 19681. The mass spectrum of tetrabutyltin was taken on the MI-1305 and MI-1311 instruments, and a substantiation was given for the dependence of the ratio H4−xSnBux+/SnBux+ upon the number of butyl groups in the ion. The processes of decomposition of metastable ions were discussed. 2.
I. L. Agafonov +4 more
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Journal of Inorganic and Nuclear Chemistry, 1961
Abstract The mass spectrum of stannane, SnH 4 , has been studied. Ion fragmentation patterns for both the singly and doubly charged fragments were obtained employing 70 V electrons. From appearance potential data, an estimation of the bond energies of the tin-hydrogen bond in the ion-species SnH 3 + H, SnH 2 + H, Sn + H has been made along with
F.E. Saalfeld, H.J. Svec
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Abstract The mass spectrum of stannane, SnH 4 , has been studied. Ion fragmentation patterns for both the singly and doubly charged fragments were obtained employing 70 V electrons. From appearance potential data, an estimation of the bond energies of the tin-hydrogen bond in the ion-species SnH 3 + H, SnH 2 + H, Sn + H has been made along with
F.E. Saalfeld, H.J. Svec
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