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Kilometer-path low-temperature multiple-reflection cell for laser spectroscopy using tunable semiconductor diodes.

K C Kim, E Griggs, W B Person

|March 6, 2010

Summary

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A versatile low-temperature multiple-reflection cell enhances laser diode spectroscopy. This system achieves long optical pathlengths for detailed analysis of gas phase molecules like N(2)O and SF(6).

Area of Science:

Spectroscopy
Physical Chemistry
Laser Technology

Background:

Laser diode spectroscopy requires precise control over sample conditions.
Long optical pathlengths are crucial for detecting weak absorption features in gases.
Variable temperature control is essential for studying temperature-dependent molecular processes.

Purpose of the Study:

To design and characterize a novel low-temperature multiple-reflection cell for laser diode spectroscopy.
To demonstrate the cell's capability for high-resolution absorption measurements.
To showcase applications in analyzing molecular bands and transitions.

Main Methods:

Utilized a multiple-reflection cell with adjustable optical pathlength (0.04–1.5 km).
Operated the cell under variable temperature control (160 K–300 K).

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Employed laser diode spectrometry for high-resolution absorption measurements.

Main Results:

The cell demonstrated effective performance across a wide range of optical pathlengths and temperatures.
Successfully illustrated pressure broadening effects in the N(2)O 16 µm band.
Obtained high-resolution absorption spectra of SF(6) rotational manifolds and analyzed hot band transitions.

Conclusions:

The developed low-temperature multiple-reflection cell is a valuable tool for high-resolution gas-phase spectroscopy.
The system enables detailed studies of molecular dynamics, including pressure broadening and rotational structures.
This technology advances the analysis of complex molecular spectra for various applications.