Related Experiment Videos
Detection of sputtered metals with cavity ring-down spectroscopy.
A P Yalin1, V Surla, M Butweiller
1Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523-1374, USA. ayalin@engr.colostate.edu
Applied Optics
|October 29, 2005
Summary
Cavity ring-down spectroscopy (CRDS) effectively detects and quantifies ion sputtering of metals like iron and titanium. This method analyzes absorption from electronic ground states, providing valuable data on sputtered particle density and detection limits.
Area of Science:
- Atomic and Molecular Physics
- Materials Science
- Spectroscopy
Background:
- Ion sputtering is a key process in materials modification and thin-film deposition.
- Accurate quantification of sputtered species is crucial for process control and understanding.
- Existing methods for detecting sputtered refractory metals have limitations.
Purpose of the Study:
- To demonstrate the utility of cavity ring-down spectroscopy (CRDS) for detecting and quantifying ion sputtering of refractory metal species.
- To investigate the sputtering of iron, aluminum, molybdenum, and titanium using CRDS.
- To compare experimental results with a sputter model and determine detection limits.
Main Methods:
- Utilized a neodymium:YAG-pumped optical parametric oscillator laser system for CRDS measurements in the 375-400 nm range.
- Measured absorption from fine-structure levels of the electronic ground-state multiplets of sputtered metal atoms.
- Examined the dependence of sputtered particle number density on ion beam current.
Main Results:
- Presented characteristic CRDS spectra for argon ion sputtering of iron, aluminum, molybdenum, and titanium.
- Determined the relationship between sputtered particle density and beam current for each metal.
- Compared measured densities with predictions from a sputter model.
- Established detection limits for the CRDS method for these refractory metals.
- For iron, aluminum, and titanium, analyzed relative populations of multiple fine-structure levels.
Conclusions:
- CRDS is a sensitive and effective technique for in-situ detection and quantification of ion-sputtered refractory metal atoms.
- The method provides detailed insights into sputtering dynamics, including particle density and population distributions.
- CRDS offers a valuable tool for optimizing sputtering processes and fundamental research in materials science.