Refinement of high precision Ru isotope analysis by negative thermal ionization mass spectrometry (CAT#: STEM-ST-0239-LJX)

Introduction

Given the variations in Ru isotopic compositions among early solar system materials, Ru isotopes show great promise for providing genetic fingerprints of diverse, late-stage accretionary additions to the Earth and Moon. This is possible because the Ru present in, for example, lunar impact melt rocks produced by basin-forming events, is primarily derived from the impactor. Ruthenium isotopes can be measured using either thermal ionization mass spectrometry or multiple-collector inductively coupled plasma mass spectrometry.

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Principle Applications Procedure Materials Notes

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:
Ru

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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