First assignment and line strengths of the 4ν4 band of 12CH4 near 1.9 μm

The investigation of the methane spectrum in the region 1.6-2 mum has provided the first assignment and analysis of the 4v(4) band near 1.9 mum. Hamiltonian and dipole moment operators written in tetrahedral formalism and adapted to the extrapolation method have been used to fit the spectra recorded at the Kitt Peak National Observatory/National Solar Observatory. Nearly 190 line positions and 160 measured intensities have been modeled with standard deviations of 0.107 cm(-1) and 18.5% respectively. (C) 2001 Academic Press.