Sample interview questions: Can you explain the concept of laser-induced breakdown detection and its significance in trace analysis?
Sample answer:
Concept of Laser-induced Breakdown Detection (LIBS)
LIBS is a spectroanalytical technique that utilizes a laser pulse to create a high-temperature plasma in a sample material. The plasma’s composition is determined by the elemental makeup of the sample, resulting in the emission of characteristic atomic and ionic emission lines.
Significance in Trace Analysis
LIBS offers unique advantages for trace analysis:
- High Sensitivity: The laser plasma generates a large number of excited atoms, enhancing the signal intensity even for trace elements.
- Minimal Sample Preparation: LIBS requires minimal sample preparation, making it suitable for real-time and in-situ measurements.
- Versatility: LIBS can be applied to a wide range of sample matrices, including solids, liquids, and gases.
- Remote Analysis: The laser-based nature of LIBS allows for remote sensing and standoff detection applications.
- Rapid Analysis: The LIBS process is relatively fast, providing results within seconds or minutes.
Applications
LIBS has numerous applic… Read full answer