New Analysis of the Pentad System of Methane and Prediction of the (Pentad-Pentad) Spectrum

Near-Infrared Spectroscopy of Simple Hydrocarbons and Carbon Oxides Diluted in Solid N2and as Pure Ices: Implications for Triton and Pluto

“…In addition to these measurements, we considered the performed for the isolated CH 4 molecule (Hilico et al 1994(Hilico et al , 1995 and also some results obtained for the CH 4 molecule isolated in N 2 (see Section 4). We generally agree with the assignments of Calvani et al (1992), except for in many cases, to be the preferable technique for planetothe bands peaking at 5919 and 5989 cm Ϫ1 in our measurelogical studies.…”

“…In addition, calculations In this section, we present experimental spectra of the pure ices CH 4 , C 2 H 4 , C 2 H 6 , CO, and CO 2 and of these on the isolated molecule indicate that this vibration is in strong interaction with other ones and would peak at 5851 molecules (except CH 4 , see Section 4) diluted in solid nitrogen. The spectral range investigated extends from cm Ϫ1 (Hilico et al 1994(Hilico et al , 1995. Such a frequency is shifted with respect to 5919 cm Ϫ1 , whereas the shift between pure ȁ3600 to ȁ10,000 cm Ϫ1 (1-2.7 Ȑm), and all these spectra have been recorded under similar experimental conditions solid and isolated state does not exceed 20 cm Ϫ1 for the other bands in this spectral region.…”

Monitoring atmospheric phenomena on Titan

“…The CH 4 mixing ratio remains constant from the surface up to the saturation level, then follows the saturation value until the tropopause, above which it stays constant. The methane absorption coefficients used in this model are taken from a re-analysis of K. Strong (Strong et al 1993) and K. Sihra (Sihra 1998) data by P. Irwin for the 1.08 and 1.28 µm windows, and from the Hilico et al (1994) updated database at and beyond 1.6 µm (Boudon et al 2006). For an update on this model and recent results, see Coustenis et al (2006) and Negrão et al (2006).…”

The infrared spectrum of Neptune at 3.5–4.1 microns: Search for H$\mathsf{_{3}^{+}}$ and evidence for recent meteorological variations

“…As in the case of the reduction of the ISO spectrum (Encrenaz et al 2000), we used a line-by-line, reflectinglayer calculation, including the CH 4 data bases of GEISA (Jacquinet-Husson et al 1997), Hilico et al (1994) and Wenger & Champion (1998), with a total number of more than 70 000 lines. A Voigt profile was used in our calculations in the vicinity of the line centers.…”