Higher energy absorption

A cr orbital can be formed either from two s atomic orbitals, or from one s and one p atomic orbital, or from two p atomic orbitals having a collinear axis of symmetry. The bond formed in this way is called a a bond. A n orbital is formed from two p atomic orbitals overlapping laterally. The resulting bond is called a n bond. For example in ethylene (CH2=CH2), the two carbon atoms are linked by one a and one n bond. Absorption of a photon of appropriate energy can promote one of the n electrons to an antibonding orbital denoted by n. The transition is then called Ti —> 7i. The promotion of a a electron requires a much higher energy (absorption in the far UV) and will not be considered here. 

HOMO-LUMO) transition. The higher energy absorption observed in Me PS Nj, Ph,re,N, and S NjOj" (but objured in the other derivatives) is assigned to a... 

Higher energy absorption edges from the adsorbed or substrate material. 

Electronic spectra of [M(CNR)4(RNHC=CNHR)X]+ cations in methanol exhibit two major visible absorptions, with the higher energy absorption (Amax 340-360 nm) more intense (e = 15,000 M l cm-1) than the... 

Shirakawa polyacetylene is its decreased crystallinity [103,116]. This is manifested not only by its diffractive properties, but also by a slightly higher energy absorption maximum in the solid state. It was found, though, that stretching the precursor polymer before elimination induced crystallinity and yielded a more Shirakawa-like polyacetylene. 

Materials with higher energy absorption capacities when exposed to cold Contaminant-resistant materials... 

Further improvement of cost-performance is being achieved by filling the bumper shell with an expanded PP foam (EPP) core, which gives a significantly higher energy absorption upon impact than conventional systems. 

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