Rutherford backscattering spectrometry (RBS) is an ion beam analysis method for determining the elemental composition of thin films. RBS provides film thickness and depth profiles of surfaces and detects the energies and numbers of backscattered ions.
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What is Rutherford backscattering spectrometry?
Rutherford backscattering spectrometry (RBS) is an ion beam technique for thin film characterization and studying solid surfaces. The technique gives quantitative information about the number of different elements present on the surface of the samples. Typically, RBS is able to measure depth profiles of thin films that are < 1 µm thick. RBS is suitable for the analysis of heavy elements on a light substrate, but light elements on a heavy substrate cannot be detected with RBS. The strength of the RBS technique is its ability to provide depth profiles for multiple elements during one measurement. Unlike many other thin film techniques including XPS depth profiling and cross-section SEM-EDX, RBS is a nondestructive method.
Typically, RBS uses a high-energy beam of He2+ ions that is directed onto a sample surface. Some of the incoming ions are scattered elastically from the sample's atomic nuclei. These backscattered ions are detected and the energy distributions and yield of ions at a given angle are measured. The detected energy is dependent on the mass of the target nucleus and the depth of the scattering event.
Suitable sample matrices
- Thin films
- Optical coatings
Ideal uses of RBS analysis
- Determining the thickness of films and coatings
- Analyzing the composition of thin films
- Determining the depth profiles of a sample's surface layers
Frequently asked questions
RBS is used to analyze the elemental composition of solid surfaces. The technique can give elemental information on the surface of a solid sample down to ~1000 nm depth.
RBS is not suitable for the analysis of light elements in heavy matrices. The sample must also be vacuum compatible.
Thin films, semiconductors, and coatings are common sample materials for RBS analysis.
Measurlabs offers a variety of laboratory analyses for product developers and quality managers. We perform some of the analyses in our own lab, but mostly we outsource them to carefully selected partner laboratories. This way we can send each sample to the lab that is best suited for the purpose, and offer high-quality analyses with more than a thousand different methods to our clients.
When you contact us through our contact form or by email, one of our specialists will take ownership of your case and answer your query. You get an offer with all the necessary details about the analysis, and can send your samples to the indicated address. We will then take care of sending your samples to the correct laboratories and write a clear report on the results for you.
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