Crystal structure of YBCO thin films grown at substrate temperatures of about 500°C

Lineshapes of the 172 and 602GHz rotational transitions of HC15N

“…This essentially different effect is modeled via the SpeedDependent Voigt profile [47,48] which needs a model describing the dependence of the relaxation rates C(v a ) on the absorber speed v a . We have retained for such a model the quadratic function of Rohart et al [30,31,33,21]…”

“…Such observations, already done on HCN in our laboratory (on one rotational line [12] and on some infrared lines [20,21]) or by other groups [14,11,17,19], are actually confirmed for a lot of molecules, in the millimeter as well as in the infrared ranges (see Refs. [28,29,11,[30][31][32][33][34][35][36]27] and [37][38][39][40][41][42][43], respectively, and references cited therein).…”

“…The SD-Galatry profile [50] contains two firmly correlated parameters impossible to decouple without additional hypotheses, so it seems to be too delicate for practical lineshape fittings. In contrast, the SD-Voigt profile has demonstrated [28,11,[30][31][32]37,21,[33][34][35][36]51,27] a very good consistency with experimental lineshapes in a wide range of pressures as well as an internal coherence vis-à -vis the basic principles of molecular collisions (linear dependence of parameters on the pressure, accordance with the fact that the optical collision radius related to the relaxation is usually greater than the kinetic Lennard-Jones radius tied to the diffusion [21,42]). We thus finally retained the SD-Voigt model for our lineshape analyses.…”

Lineshape analysis of the J=3←2 and J=5←4 rotational transitions of room temperature CO broadened by N2, O2, CO2 and noble gases

“…As previously identified [28][29][30][31], the actual dependence of the relaxation rate C(v a ) on the absorber speed is easily taken into account with the empirical quadratic form first introduced by Rohart [33], (see also [34]):…”

“…Since collisions occur in the binary regime, we note that rates C 0 and C 2 must be both linearly pressure dependent. This model leads to an analytical form of the SDVP [33,34]. Expressed in the time-domain we obtain:…”