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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Sulfur dioxide absorption at DF laser wavelengths.

J Altmann, P Pokrowsky

|March 18, 2010

Summary

Sulfur dioxide (SO2) absorption was measured using DF laser lines. A strong absorption peak was identified at 3.9843 micrometers, crucial for atmospheric monitoring.

Area of Science:

Atmospheric Chemistry
Spectroscopy
Laser Physics

Background:

Accurate measurement of sulfur dioxide (SO2) absorption is vital for atmospheric monitoring and pollution control.
Understanding SO2 spectral properties at various wavelengths is essential for remote sensing applications.

Purpose of the Study:

To measure the absorption coefficient of sulfur dioxide (SO2) across twenty deuterium fluoride (DF) laser lines under atmospheric conditions.
To identify specific wavelengths with significant SO2 absorption for potential atmospheric sensing applications.
To characterize the pressure dependence and broadening effects of a strongly absorbed SO2 line.

Main Methods:

Utilized twenty DF laser lines to measure SO2 absorption coefficients.
Investigated weak absorption around 3.7 micrometers.

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Precisely measured the absorption cross-section of the P(4)(6) line at 3.9843 micrometers and its pressure dependence.

Main Results:

Weak SO2 absorption (alpha* ≤ 0.003 cm(-1) atm(-1)) was observed at several wavelengths near 3.7 micrometers.
A strong absorption peak for SO2 was identified at the P(4)(6) DF laser line (3.9843 micrometers) with an absorption coefficient of (0.44 ± 0.01) cm(-1) atm(-1).
Self-broadening and foreign-gas broadening coefficients for the P(4)(6) line were determined to be between 1.5 and 5 MHz/Torr.

Conclusions:

The P(4)(6) DF laser line at 3.9843 micrometers is highly suitable for detecting sulfur dioxide (SO2) in the atmosphere due to its strong absorption.
The spectral characteristics, including pressure broadening, of this line provide valuable data for atmospheric remote sensing and quantitative analysis of SO2 concentrations.