Re-evaluation of ortho-para-dependence of self pressure-broadening in the ν + ν band of acetylene.

Optical frequency comb-referenced measurements of self pressure-broadened line profiles of the R(8) to R(13) lines in the ν + ν combination band of acetylene near 1.52 µm are reported. The analysis of the data found no evidence for a previously reported [Iwakuni et al.