Four-Wave Processes in Spectroscopy of Vibrational Molecular States

The Spectral Features of Polyatomic Molecules Multiphoton Excitation in a Strong IR‐Laser Field

“…+ x/ 6T 44 + T,P 4 + T633' 66 (11) where five constants of sextic anharmonicity are defined and two tensor operators 4 and ,66 introduced in Reference 25 are used. The sextic anharmonicity term was taken into account when calculating the excited state spectra.…”