Negative thermal ionization mass spectrometry

WaIczyk T (1997) Iron isotope ratio measurements by negative thermal ionization mass spectrometry using FeF4" molecular ions. Int J Mass Spectrom Ion Proc 161 217-227... 

Wachsmann M, Heumann KG (1992) Negative thermal ionization mass spectrometry of main group elements, part 2. 6th group Sulfur, selenium, and tellurium. Int J Mass Spectrom Ion Proc 114 209-220... 

Volkening, J., Koppe, M., and Heumann, K. G. (1991) Tungsten isotope ratio determinations by negative thermal ionization mass spectrometry. International Journal of Mass Spectrometry and Ion Processes, 107, 361-368. 

A main characteristic of TIMS is that positively or negatively charged ions of the analyte are also formed and used for mass spectrometric analysis. In negative thermal ionization mass spectrometry (NTIMS) elements or molecules with a relatively high electron affinity (/iea > 2eV) can be... 

Anbar, A.D., Papanastassiou, D.A. and Wasserburg, G.J. (1997) Determination of iridium in natural waters by clean chemical extraction and negative thermal ionization mass spectrometry. Anal. Chem., 69, 2444—2450. 

Hemming, N.G., Hanson, G.N. 1994. A procedure for the isotopic analysis of boron by negative thermal ionization mass spectrometry. Chemical Geology 114 147-156. 

Vengosh, A. Chivas, A. R. McCulloch, M. T. Direct determination of boron and chlorine isotopes in geological materials by negative thermal-ionization mass spectrometry. Chem. Geol. 1989, 79, 333-343. 

The Re-Os decay system is discussed separately, in part because there are far fewer osmium isotope data than Sr-Nd-Pb data. This is true because, until —10 years ago, osmium isotopes in silicate rocks were extraordinarily difficult to measure. The advent of negative-ion thermal ionization mass spectrometry has decisively changed this (Greaser et al., 1991 Vblkening et al., 1991), and subsequently the number of publications providing osmium isotope data has increased dramatically. 

Garozzo, D., Giuffrida, M., and Montaudo, G., Primary Thermal Fragmentation in Poly(Lactic-Acid) Investigated by Positive and Negative Chemical Ionization Mass Spectrometry, Polym. Deg. Stab., 15,143,1986. 

Thermal ionization mass spectrometry (TIMS) has been the technique of choice in most lead and strontium isotope ratio studies. TIMS is a bulk technique, where samples are powdered and concentrated prior to analysis. This bulk technique has two negative features. First, processing of samples is time-consuming and requires additional laboratory equipment. Second, the samples must be homogeneous. This aspect of TIMS is problematic in samples where small-scale compositional vari-... 

This book is based on the study of reactions of thermal electrons with molecules using the ECD, negative ion chemical ionization (NICI) mass spectrometry in the gas phase and polarographic reduction in aprotic solvents [18]. Only the complementary studies related to our research are considered here. 

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