Line strength analysis of the 12CD4 infrared spectra in the pentad region

Abstract

High accurate ro-vibrational spectra of ${}^{12}$CD${}_4$ were measured in the pentad region with a Bruker IFS125 HR Fourier transform infrared (IR) spectrometer at an optical resolution of 0.003 cm⁻¹ and different pressures and optical path-lengths. The analysis of 1264 experimental absolute transition strengths belonging to all nine ro-vibrational sub-bands of the ${}^{12}$CD${}_4$ pentad was performed using the Voigt profile to simulate the measured line shape and to determine experimental line intensities. A set of 10 parameters was obtained from the weighted fit analysis of experimental data in the frame of the model of an effective dipole moment operator of the ${}^{12}$CD${}_4$ pentad. The obtained set of 10 effective dipole moment parameters reproduces the initial 1264 absolute transition strengths with the d${}_{\text{rms}}=4.52\text{\%}$. A line list of the studied experimental ro-vibrational transitions up to $J\le 25$ is presented in the Supplementary data to this paper.