Analysis of the ν1 fundamental of NF3 combining FT and laser side-band saturation spectroscopy. A secondary standard for the 1000–1060 cm−1 region

Abstract

The ν1, fundamental of NF3 at 1032 cm−1 has been investigated by Fourier transform (FT) spectroscopy (1295 transitions; J, K up to 43, 41, respectively) and with the saturation technique using CO2 laser side bands as a tunable infrared source. In the latter case, 158 transitions between J = 2 and J = 41 have been observed, with a resolution of 250 kHz and an absolute accuracy of ±200 kHz. The FT spectrum was calibrated using the saturation dips as a frequency standard. From a combined fit the transition frequency has been determined to ν0 = 1032.001 237 50(47) cm−1. All measured lines are available for use as a secondary standard in the 1000 – 1060 cm−1 region.