Experimental and theoretical investigation on N₂ pressure-induced coefficients of the lowest rotational transitions of HCN
Abstract
We present the first experimental determination of room-temperature N₂ pressure broadening, speed dependent broadening, and pressure shift coefficients of the three lowest rotational lines of HCN. The experimental results served to assess the accuracy of a low-cost yet accurate computational strategy, which relies on a simplified characterization of the HCN-N₂ interaction potential, and employs a novel approximate method of solving the quantum scattering problem. Building on the validation of this computational approach, the dataset was extended to higher rotational transitions, up to J(HCN)=5 ← 4. For these transitions, we provide the temperature dependence of the pressure broadening coefficient, its speed dependence parameter, and the Dicke narrowing parameter. This new dataset can support and refine the modeling of HCN in both the terrestrial and Titan's atmospheres. This work constitutes an important step towards populating spectroscopic databases with accurate HCN line shape parameters.
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BibTeX
@article{tonolo2026experimental,
title = {{Experimental and theoretical investigation on N₂ pressure-induced coefficients of the lowest rotational transitions of HCN}},
author = {Francesca Tonolo and Hubert Jóźwiak and Luca Bizzocchi and Mattia Melosso and Piotr Wcisło and François Lique and Cristina Puzzarini},
journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
year = {2026},
month = nov,
doi = {10.1016/j.jqsrt.2025.109521},
url = {https://hal.science/hal-05167047v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Experimental and theoretical investigation on N₂ pressure-induced coefficients of the lowest rotational transitions of HCN
AU - Francesca Tonolo
AU - Hubert Jóźwiak
AU - Luca Bizzocchi
AU - Mattia Melosso
AU - Piotr Wcisło
AU - François Lique
AU - Cristina Puzzarini
PY - 2026
DA - 2026/11/02
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
DO - 10.1016/j.jqsrt.2025.109521
UR - https://hal.science/hal-05167047v1
AB - We present the first experimental determination of room-temperature N₂ pressure broadening, speed dependent broadening, and pressure shift coefficients of the three lowest rotational lines of HCN. The experimental results served to assess the accuracy of a low-cost yet accurate computational strategy, which relies on a simplified characterization of the HCN-N₂ interaction potential, and employs a novel approximate method of solving the quantum scattering problem. Building on the validation of this computational approach, the dataset was extended to higher rotational transitions, up to J(HCN)=5 ← 4. For these transitions, we provide the temperature dependence of the pressure broadening coefficient, its speed dependence parameter, and the Dicke narrowing parameter. This new dataset can support and refine the modeling of HCN in both the terrestrial and Titan's atmospheres. This work constitutes an important step towards populating spectroscopic databases with accurate HCN line shape parameters.
SN - 0022-4073
SN - 1879-1352
ER -