Study of electroplated gold by spark source mass spectrometry (CAT#: STEM-ST-0283-LJX)

Introduction

RF vacuum arcs between hard gold plating plates were found to contain unexpectedly high concentrations of C+ and N +. These ions come from the bulk of the plating, not from surface adsorbed substances or background gases in the instrument. A small amount of potassium is also blocked in the gold plate. Soft gold plating is found to be quite pure in bulk, but with a high level of surface contamination. Mass analysis of hard gold samples previously analyzed for carbon content by He activation shows that the ion ratio of C+/Au+ in the arc is approximately 16 times that of the C/Au atom ratio in the solid. This amplification is attributed to extreme differences in volatility between the substrate and the impurities. No significant molecular species were observed in all spectra except one, which is consistent with extremely high arc temperatures.

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Principle Applications Procedure Materials Notes Related Products

Principle

By using vacuum spark discharge, the energy accumulated in a small volume can make the material in the volume suddenly evaporate and ionize, so as to obtain the characteristic ion current information.

Applications

(1) Solid spark source mass spectrometry: impurity analysis of high-purity materials, which can be applied to semiconductor materials, non-ferrous metals, and building materials industries;
(2) Gas isotope mass spectrometry: determination of stable isotopes C, H, N, O, S and radioactive isotopes Rb, Sr, U, Pb, K, Ar, which can be applied to geology, petroleum, medicine, environmental protection and agriculture.

Procedure

(1) An electric field is applied between the electrodes to ionize part of the carrier gas (such as argon) in the electric field;
(2) The "cathode ray" or "anode ray" generated by ionization accelerates in the direction of the opposite polarity in the residual gas, bombards the anode or cathode, and vaporizes a part of the substance to be measured on the plate;
(3) Part of the atoms of the vaporized substance are ionized in the subsequent discharge process.

Materials

• Sample Type:
Electroplated gold

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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