Frame distortion

Doors and windows removed. Some frame distortion to steel frame buildings and cladding removed. Some electrical/instniment cables broken. ... 

Finally, dipoles may arise from collisional frame distortion . Polyatomic molecules like C02, CH4, SF6, C2H6.in their ground states are non-... 

It is well known that the tetrahedral frame of the CH4 molecule is easily distorted. If the tetrahedral frame of CH4 were robust, the purely rotational infrared spectra of CH4 would not exist. However, even at temperatures as low as room temperature, the CH4 molecule features hundreds of very weak, dipole-allowed rotovibrational lines at frequencies from 42 to 208 cm-1, the so-called groundstate to groundstate (gs—>gs) transitions. Moreover, more than 1500 weak, dipole-allowed transitions exist within the polyad system v /v — 1/2/1, at frequencies from 14 to 500 cm-1 [42]. These allowed transitions arise from distortions of the tetrahedral frame by rotation and the internal dynamics of the CH4 molecule, due to the coupling of normal modes of the flexible CH4 frame. Collisional frame distortion should probably be associated with unresolved gs— gs and similar polyad bands. Some evidence of such collision-induced bands of CH4 in CH4-X complexes has been pointed out [39-41]. Besides these collision-induced bands that presumably are due to collisional frame distortion of CH4, fairly significant, unexplained collision-induced bands also exist that are shaped by rotovibrational transitions of the collisional partner X = H2, N2, or CH4, and by double transitions of the bimolecular CH4-X complex [39-41]. 

S. Weiss. Frame distortion as a possible mechanism for collision induced infrared absorption. J. Phys. Chem., 86 429, 1982. 

S. Weiss. Frame distortion in some linear and tetrahedral molecules. Chem. Phys. Lett., 114 536, 1985. 

Steel frame distorted and pulled away from foundation... 

The pressure of the current made the cross frames distort towards the downstream. 

HG. E-47 Support frame distortion. (Source Townson Expansion Joints.)... 

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