Diode-laser measurements of H2-broadening coefficients in the ν5 band of C2H2

Linewidths of C2H2 perturbed by H2: experiments and calculations from an ab initio potential

“…Much less attention has been paid to the molecular-broadening of acetylene lines. Experimentally, N 2 -, O 2 -, H 2 -pressure broadening [6,[15][16][17][18][19][20][21][22] and self broadening pressure coefficients [6,15,23] have been measured at various temperatures between 147 and 300 K.…”

“…Before this work, the theoretical studies of molecular partners [18][19][20][21][22][23] were typically per-2 formed on the basis of the Robert-Bonamy semi-classical formalism [24] using semi-empirical potential energy surfaces (PES). Only two of these works dealt with hydrogen.…”

“…Only two of these works dealt with hydrogen. [21,22] Quantum dynamical studies of collisional line broadening in the case of a linear molecule colliding with another one (eventually the same) are much more laborious than in the case of atomicmolecule systems. The corresponding computer cost is much higher than for semi-classical computations, and thus such quantum calculations are quite rare.…”

Hydrogen-Broadening Coefficients in the ν5 Band of Acetylene at Low Temperature

“…For the intermolecular potential, we have considered, as in Ref. (4), the atom-atom Lennard-Jones model in addition to the electrostatic interactions. Finally the temperature dependence of broadening coefficients is deduced experimentally from our measurements at 297 K (4) and 173.2 K, and theoretically from the calculated results at the same temperatures.…”

The HITRAN 2004 molecular spectroscopic database

“…These new parameters were constructed from Refs. [257,[399][400][401][402] for H 2 , Refs. [403,404] for He and Refs.…”