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The vacuum-ultraviolet absorption spectra of boron-trihalides

โœ Scribed by A.A. Planckaert; P. Sauvageau; C. Sandorfy

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
374 KB
Volume
20
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The vacuum-ultraviolet spectra from 200 to 120 nm of BFJ, BC13 and BDrs are reported. Tentative assignments are made. The lowest frcqucncy band of DC13 and BBr3 can be assigned to a valence-shell transition of the ?I* + n type. The second band can be described equnll?r well 3s a Rydberg tr~lsition to a 3s orbital or as a vrilence.shcll Vansition of the u* * o type. The strongest bands found at higher frcquencics in the spectrum of BBr3 can be assigned to transitions to p-type Rydbcrg crbitals related to fhp: three lowest (close lying) ionization potentials. Some waker bands arc likely to result from spin-orbit coupling.

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Measurements of the optical absorption spectra of the sublimed films of adenine, guanine, cytosine, thymine, and uracil were extended down to 120 mp at room temperature. Several remarkable absorption peaks were found to exist below 190 mp in addition to the already known ones near 260 mp and 200 mp.