Scattered Light and Other Corrections in Absorption Coefficient Measurements in the Vacuum Ultraviolet: A Systems...

Area of Science:

• Spectroscopy
• Analytical Chemistry
• Physical Chemistry

Background:

• Accurate measurement of gaseous absorption coefficients is crucial in various scientific fields.
• Vacuum ultraviolet (VUV) spectroscopy presents unique challenges due to low light source intensity and scattered light.
• Existing methods are susceptible to significant errors, particularly in specific wavelength regions.

Purpose of the Study:

• To describe a computer-automated system for VUV spectroscopy.
• To identify and address sources of error in measuring gaseous absorption coefficients.
• To develop a data treatment method for eliminating scattered light errors.

Main Methods:

• Implementation of computer automation for a VUV spectrometer and auxiliary components.
• Analysis of errors introduced by scattered light, especially with low-intensity sources like D2 lamps (120-130 nm).
• Development and application of a data correction method to mitigate scattered light effects.

Main Results:

• The automated system demonstrates high efficiency and precision in VUV absorption measurements.
• The proposed data treatment effectively eliminates errors caused by scattered light.
• Experimental validation confirms the accuracy of the improved measurement approach.

Conclusions:

• Computer automation significantly enhances the precision of VUV spectroscopic measurements.
• A robust method for correcting scattered light errors has been established.
• This approach enables more reliable determination of gaseous absorption coefficients in the VUV spectrum.