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Multiple-pass cell for very-long-path infrared spectrometry.

J F Doussin¹, R Dominique, C Patrick

¹Laboratoire Interuniversitaire des Systèmes Atmosphériques, Unité Mixte de Recherche du Centre National de la Recherche Scientifique 7583, Université Paris 7 et Paris 12, Faculté des Sciences, 61, avenue du Général De Gaulle 94010 Créteil Cedex, France.

|March 8, 2008

Summary

This study introduces a modified White multiple-pass cell for mid-infrared spectrometry, enhancing path length and beam stability within an evacuable chamber. The research also provides a formula for optimizing signal-to-noise ratio in multi-reflection cells.

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Area of Science:

Spectroscopy
Analytical Chemistry
Optical Engineering

Background:

Mid-infrared (mid-IR) spectrometry requires long optical paths for sensitive analysis.
Existing multiple-pass cells can face challenges with beam stability and environmental control.

Purpose of the Study:

To describe a novel multiple-pass cell for mid-IR spectrometry.
To enable operation within an evacuable environmental chamber.
To enhance path length and beam stability.

Main Methods:

Design and implementation of a modified White multiple-pass cell.
Integration into an evacuable environmental chamber.
Derivation of an expression for signal-to-noise ratio optimization.

Main Results:

The modified White cell significantly increases the optical path length.
Spectrometric beam stability is maintained.
An approximate expression relating reflections to optimal signal-to-noise ratio was derived.

Conclusions:

The developed multiple-pass cell is effective for mid-IR spectrometry in controlled environments.
The design offers improved performance through increased path length and stability.
The derived expression aids in optimizing signal-to-noise ratio for multiple-reflection cells.