High precision tungsten isotope measurement by thermal ionization mass spectrometry (CAT#: STEM-ST-0201-LJX)

Introduction

Over the past two decades, the short-lived 182Hf–182W chronometer (T1/2 = 8.9 Myr) has been widely used for dating early Solar System processes, due to the unique geochemical properties of the system. Tungsten is a siderophile (iron-loving) element, and as such, it is largely (but not completely) extracted from the silicate mantles of planetary bodies during segregation of metallic cores. Hafnium, in contrast, is lithophile (silicate-loving) and is wholly retained in the silicate portion of planetary bodies. Therefore, determination of the abundance of the daughter nuclide, 182W, relative to other stable, non-radiogenic W isotopes (e.g., 184W) is of special interest for constraining the timing of planetary core formation.

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Principle Applications Procedure Materials Notes Related Products

Principle

Thermal ionization mass spectrometry exploits the thermochemical reactions that occur in molecules in a sample when they are irradiated by a beam of high energy electrons. This reaction usually takes place at high temperatures, resulting in the formation of ions. The ionized species are accelerated in an electric field and then analyzed by mass spectrometry through the ion-focusing lens of a mass spectrometer. The mass spectrometer will separate and detect the ions according to their mass and charge.

Applications

For analyzing the distribution of molecules, atoms and molecular groups.
For studying the chemical structure of Earth's minerals and rocks.
For studying the structure and function of biomolecules.
For studying problems in physics.

Procedure

1. The sampling system sends the sample to be analyzed into the ion source;
2. The ion source ionizes the atoms and molecules in the sample into ions;
3. The mass analyzer separates ions according to the size of the mass-charge ratio;
4. The detector is used to measure and record the intensity of the ion current to obtain the mass spectrum.

Materials

• Sample Type:
Tungsten

Notes

Before starting the machine, check whether the water (water cooler), electricity, gas (argon/nitrogen), temperature, humidity, and exhaust air of the instrument are normal.

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