Abstract

A new method is described, allowing cancellation of systematic effects in the comparison between different spectra recorded with a general purpose high-information Fourier spectrometer. Preliminary tests on pressure-shift measurements of the 1–0 vibration–rotation band of CO at 5μm demonstrate improvement in the sensitivity and the precision of two orders of magnitude. With a SNR of ∼200, no evidence of systematic shifts due to the method itself exists over 10⁻⁶ cm⁻¹ (30 KHz). (This corresponds, for example, to an astronomical radial velocity of 0.15 msec⁻¹.) Wave number pressure shifts due to 5 Torr of CO are easily detectable. The 50 analyzed lines of the CO band belong to 300,000 spectral elements recorded in spectra covering 1000 cm⁻¹. This clearly indicates that accurate pressure-shift measurements of very extensive spectra become possible. The method has also all the known advantages of differential spectroscopy performed here for the first time with Doppler-limited resolution.

© 1981 Optical Society of America

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