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Optical frequency comb-referenced measurements of self pressure-broadenedline profiles of the R(8) to R(13) lines in the \thisband combination band ofacetylene near 1.52$\mu$m are reported. The analysis of the data found noevidence for a previously reported [Iwakuni et al. \textit{Phys. Rev. Letts.}\textbf{117}, 143902(5) 2016] systematic alternation in self pressure-broadenedline widths with the nuclear spin state of the molecule. The present workbrought out the need for the use of an accurate line profile model and acareful accounting for weak background absorptions due to hot-band and lowerabundance isotopomer lines. The data were adequately fit using the quadraticspeed-dependent Voigt profile model, neglecting the small speed-dependentshift. Parameters describing the most probable and speed-dependentpressure-broadening, most probable shift, and the line strength were determinedfor each line. Detailed modeling of the results of Iwakuni et al. showed thattheir neglect of collisional narrowing due to the speed-dependent broadeningterm, combined with the strongly absorbing data recorded and analyzed intransmission mode were likely the reasons for their results.

Re-evaluation of ortho-para-dependence of self-pressure broadening in the $v_1+v_3$ band of acetylene