Chlorine monoxide (ClO) is thought to play an important role in a photochemical cycle which causes the destruction of ozone in the earth’s stratosphere. Since lines of the (1,0) fundamental of ClO lie near ¹⁴C¹⁶O₂ laser lines, IR heterodyne spectroscopy is potentially an important technique for monitoring the ClO abundance. However, due to the presence of lines from other trace atmospheric gases in this spectral range, the interpretation of such observations is ambiguous unless high-resolution laboratory measurements support the identifications. We report here measured frequencies for spectral lines of seven trace atmospheric gases which absorb near the ¹⁴C¹⁶O₂ laser transitions relevant to the detection of ClO by IR heterodyne spectroscopy.

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