Heterodyne frequency measurements of the 1-0 band of HF at 2.7 μm

• Published in: Journal of molecular spectroscopy 1991-06, Vol.147 (2), p.392-397
• Main Authors: Goddon, D., Groh, A., Hanses, H.J., Schneider, M., Urban, W.
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Physics; Properties of molecules and molecular ions; Rotation, vibration and vibration-rotation constants
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/0022-2852(91)90064-H

Absolute frequencies of five rotational-vibrational transitions of the v = 1 ← 0 band of hydrogen fluoride around 3800 cm −1 were measured with sub-Doppler resolution. A beat frequency was measured between two Lamb-dip stabilized CO lasers and a tunable color center laser whose frequency was locked to the molecular transition by means of Doppler-free polarization saturation spectroscopy. The transition frequencies have been determined with an absolute accuracy of ±1 MHz. This is an improvement of almost one order of magnitude to earlier Fourier-transform measurements by Guelachvili ( Opt. Commun 19, 150–154 (1976)) which are systematically higher by about 15 MHz.