Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at low temperatures

•The high resolution allowed accurate measurements of very dense spectra.•Collisional broadenings of allene diluted in nitrogen were measured.•The measurements were realized at 5 temperatures ranging from 167 K to 267 K.•Broadening coefficients were determined by fitting Voigt and Rautian profiles.•Temperature dependence parameters were determined for the first time.

Using a tunable diode-laser spectrometer, we have measured the N2-broadening coefficients of allene for 5 lines in the ν10 fundamental band near 11 μm at five low temperatures ranging from 167.7 K to 259.7 K. The collisional halfwidths have been obtained by fitting the spectral lineshapes with the Voigt and the Rautian profiles. For these lines, the n parameter of the temperature dependence has been determined giving respectively mean values of 0.651 (0.038) and 0.612 (0.027) for the Voigt and Rautian models.