Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Transcribed Image Text:**Title: Understanding Infrared Beam Penetration in ATR-FTIR Spectroscopy**
**Question:**
Roughly how far does an infrared beam penetrate into the sample using an ATR-FTIR spectrometer? Select one:
- a) 1 mm
- b) 1 µm
- c) 1 pm
**Explanation:**
In Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) Spectroscopy, an infrared beam penetrates a very small distance into the sample. This penetration depth is typically in the micrometer (µm) range, making option b) 1 µm the correct choice. The exact depth depends on factors such as the wavelength of the infrared light and the refractive index of the crystal and the sample.
**Diagram:**
The image might contain diagrams such as hexagonal shapes, representing molecular structures that are analyzed using ATR-FTIR. These structures help visualize how infrared light interacts with different molecular bonds to provide unique spectral data, essential for identifying and studying substances.
**Educational Insight:**
Understanding the penetration depth in ATR-FTIR is crucial for interpreting spectra correctly, especially when examining surface or thin film samples where depth profiling is important.
Expert Solution
Step 1
ATR-Attenuated Total Reflectance.
FTIR- Fourier Transform Infrared spectroscopy.
ATR-FTIR is used to measure the surface properties of the solid powder sample or thin films instead of the bulk properties.
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