Knowledge Bank

We have recorded the spectrum of carbonyl sulphide in the region of the $v1$ band with near Doppler-limited resolution ($0.0024cm-1$ unapodized) using a Bomem DA3.002 spectrometer. The OCS sample had natural isotopic abundances, and a 15 cm absorption path was used. Sixteen bands were analyzed, including the following five bands for the first time at high resolution: As pointed out $previously,1$ OCS is an excellent calibrant for tunable infrared lasers because it is relatively easy to obtain and handle, it exhibits strong regularly spaced lines with abundant weaker structure to aid in location, it does not exhibit hyperfine structure, and each band can be well-represented by relatively few parameters. Our results should be helpful for diode laser calibration in the $5\mu m$ region.