The absorptions near 1,500 and between 1,550 and 1,700 cm-1 can be attributed to overtones and combination tones of OH- and H2O fundamental vibrations.
Therefore, many combination tones appear which can interact by anharmonicity with fundamental vibrations of corresponding symmetry and which result in shifting them to different sides.
Indeed, from work [17], (Fig. 2, upper panel) follows that combination tones ω LA (q M ) + ω LA (−q M ) ≈ ω LA (q K ) + ω LA (−q K ) ≈470 cm−1 are fully symmetric and have frequency greater than ( {omega}_{A_1^{hbox ) (for points K, M symmetry group can be subgroup of D 3h, for example, C 3h ).
In the present work, we show that the reason of different dependences of frequencies can be related to both the van der Waals (vdW) interlayer interaction and the anharmonic interaction of noted fundamental vibrations with the corresponding combination tones (CT) of layer that manifests itself due to Fermi resonance in the layer.
As the method utilizes general and systematic computational procedures, it can be applied to analyze the multi-tone or combination-tone responses for higher-dimensional non-linear systems such as multi-disk rotors or automotive drivelines with multiple excitational inputs.
"You're throwing everything you have at it - a combination of tone of voice, volume and swearwords.
To break down more atoms in the power of white superiority DNA (a/k/a racism), had Tyson not answered the question with just the right combination of tone, sincerity, and levity, and with the wisdom to answer the question with a better question -- meaning had he responded with signs of aggression or any attribute of a rebellious Negro -- let's just say he might not have a primetime show.
Gray is a neutral, and so can go with any color, combination, skin tone, and occasion.
