Stretch marks position

Picture used to take note of the general position of stretch marks and the areas treated with ETCA/abrasion. 

Changes in the K-W parameters do not markedly change the equilibrium position. Using TNT parameters in the stretch bkw code, Mader predicted an (H2O/CH4) ratio of 178 for TNT at 1.00 g/cc. Using the RDX parameter set in ruby, Hurwitz at NOL reported (H20/CH4) = 144 for the same explosive at the same density.2... 

Amides have a very strong tendency to self-associate by hydrogen bonding, and the appearance of the spectrum is very much dependent on the physical state of the sample. Considerable shifts in band positions can occur on passing from a dilute solution to a solid, thus N—H and C=0 stretching bands show a marked shift to lower frequency while the N—H bending (amide II) band moves to higher frequency. 

When H2S is chemisorbed on platinum or water adsorbed on silica, the S—H and 0—H stretching bands appear at positions close to those observed for H2S and H20 in the gaseous state. These results, together with those found for chemisorbed ammonia, indicate that the stretching vibrations of the single bonds to hydrogens are not markedly affected, by formation of coordinate bonds between a surface and the central atom of the molecule. 

Carborane and decaborane show similar behavior in that both molecnles adsorb molecularly on Pt(lll) at 85 K, nndergo some strnctnral changes at low temperatures, and lose hydrogen in stages when the temperature is raised, as determined by both RAIRS and TPD. The RAIR spectra show remarkably sharp B-H stretch peaks. The fact that the individual B-H stretch peaks can be resolved here is in marked contrast to experimental IR spectra of solid carborane , which show only a broad feature about 100 cm wide centered at 2620 cm Both C2B10H12 and BioHu are assumed to be adsorbed molecularly on Pt(lll) at 85 K, because the RAIR spectra for submonolayer and multilayer coverages do not differ that much from each other as far as the B-H stretch positions are concerned. 

The far-infrared spectrum of Rh4(CO)i2 has been measured (7) and the four bands observed have been assigned as 225 cm", c 200 cm , e 176 cm , Uj and 128 cm, a. These bands are not markedly different from those observed for Ir4(CO)i2 334) despite their significantly different crystal structures 377). The single force constant, however, obtained from calculations based on a pseudotetrahedral structure could not satisfactorily predict the band positions. Using an M M model, values of 0.95 mdyne/A were obtained for the basal stretching force constant and 1.35 mdyne/A for the M—M force constant. 

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