Electron spin resonance (ESR) and thermal ionization mass spectrometric (TIMS)230Th/234U dating of teeth in Middle Paleolithic layers at Amud Cave, Israel

2001 ◽  
Vol 16 (6) ◽  
pp. 701-717 ◽  
Author(s):  
W. Jack Rink ◽  
H.P. Schwarcz ◽  
H.K. Lee ◽  
J. Rees-Jones ◽  
R. Rabinovich ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Mass Spectrometric ◽  
Thermal Ionization ◽  
Middle Paleolithic ◽  
Ionization Mass ◽  
Spin Resonance ◽  
Thermal Ionization Mass

Isotope Dilution–Total Evaporation–Thermal Ionization Mass Spectrometric Direct Determination of Radioactive Strontium-90 in Microdrop Samples

2020 ◽  
Vol 92 (24) ◽  
pp. 16058-16065
Author(s):  
Chihiro Ito ◽  
Ryoya Shimode ◽  
Takashi Miyazaki ◽  
Shigeyuki Wakaki ◽  
Katsuhiko Suzuki ◽  
...  
Keyword(s):  
Isotope Dilution ◽  
Direct Determination ◽  
Mass Spectrometric ◽  
Thermal Ionization ◽  
Ionization Mass ◽  
Total Evaporation ◽  
Strontium 90 ◽  
Thermal Ionization Mass

Mass spectrometric and electron spin resonance study of allylic peroxyl radicals in the gas-phase reaction between allylic radicals and dioxygen

1986 ◽  
Vol 51 (12) ◽  
pp. 2675-2684 ◽  
Author(s):  
Karel Mach ◽  
Jana Nováková ◽  
Vladimír Hanuš ◽  
Zdeněk Dolejšek
Keyword(s):  
Electron Spin Resonance ◽  
Gas Phase ◽  
Electron Spin ◽  
Esr Spectra ◽  
Mass Spectrometric ◽  
Peroxyl Radicals ◽  
Electron Spin Resonance Study ◽  
Phase Reaction ◽  
Mass Spectrometric Measurement ◽  
Spin Resonance

Mass spectrometric measurement of the pyrolyzed (790-1 030 K) mixture of 1,5-hexadiene or 2,5-dimethyl-1,5-hexadiene with dioxygen afforded no evidence for the presence of allylic peroxyl radicals or aldehydes in the gas phase though the allylic radicals were readily detected at low ionization potentials. On the other side, the electron spin resonance measurement revealed that the allylic radicals were converted quantitatively to allylic peroxyl radicals during condensation of pyrolytic mixtures at 77 K, and acrolein and methacrolein were found mass spectrometrically after thawing of the condensed pyrolytic material as stable products of the allylperoxyl and 2-methylallylperoxyl radical, respectively. These results are compatible with the temperature dependent dissociation equilibrium of the allylic peroxyl radicals. The allylic peroxyl radicals were trapped at 77 K using co-condensation with adamantane from the gas phase in yields as high as 30-50% of the radicals produced in pyrolysis. The electron spin resonance spectra showed partial motional freedom of the peroxyl radicals when they were trapped in the low-contaminated adamantane matrix at 77 K, but in matrices highly contaminated with the biallyl hydrocarbon and products of pyrolysis the ESR spectra indicated rigidly trapped peroxyl radicals. Free rotation of the allylic peroxyl radicals in both types of matrices occurred at 110 K.

New electron spin resonance and mass spectrometric studies of metallofullerenes

1994 ◽  
Vol 229 (1-2) ◽  
pp. 115-121 ◽  
Author(s):  
A. Bartl ◽  
L. Dunsch ◽  
J. Fröhner ◽  
U. Kirbach
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Mass Spectrometric ◽  
Spin Resonance
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