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Publication Citation: High-Precision Pressure Shifting Measurement Technique Using Frequency-Stabilized Cavity Ring-Down Spectroscopy

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Author(s): D J. Robichaud; Joseph T. Hodges; D Lisak; Charles E. Miller; Mitchio Okumura;
Title: High-Precision Pressure Shifting Measurement Technique Using Frequency-Stabilized Cavity Ring-Down Spectroscopy
Published: January 01, 0008
Abstract: We describe a high-precision method for measuring pressure shifting of absorption lines. The technique involves the acquisition of high-resolution spectra using a cavity ring-down spectrometer whose length is continuously locked to a frequency-stabilized reference laser over a range of sample pressures. We discuss a relatively large correction arising from the pressure-dependenceof dispersion in the cavity modes, and we demonstrate pressure shifting measurements in air for transitions in the O2 A band. Pressure shifts in the range -0.010 cm^(-1) atm^(-1) to $-$0.007 cm^(-1) atm^(-1)$ are reported. We measured relative positions of line centers to within 70 kHz and determined pressure shifting coefficients over a 5 kPa pressure range with relative uncertainties approximately equal to 0.55%, which constitutes a ten-fold improvement over previous measurements.
Citation: Journal of Quantitative Spectroscopy and Radiative Transfer
Volume: 109
Pages: pp. 435 - 444
Keywords: air refractive index;cavity ringdown spectroscopy;O2 A-band;pressure shift
Research Areas: Remote Sensing, Spectroscopy, Electronic, Near Infra-Red