ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The ultraviolet (UV) absorption cross sections from 185 to 320 nm have been measured for four group IIIb and two Vb alkyl compounds. These are trimethylaluminum (TMAl), trimethylgallium (TMGa), triethylgallium (TEGa), ethyldimethylindium (EDMIn), trimethylarsenic (TMAs), and tertiarybutylphosphine (TBP). In the case of ethyldimethylindium (EDMIn) and tertiarybutylphosphine (TBP), the UV absorption spectra have not been previously recorded. The UV absorption cross sections were measured at 193, 222, and 248 nm; wavelengths that are readily achieved with commercially available excimer lasers. The UV spectra of the group IIIb compounds show a weak long-wavelength absorption followed by a strong absorption, while those of the group Vb compounds show a sharp cutoff in the long-wavelength end of a strong absorption. TMGa, TEGa, and TMAs exhibit a decreasing absorption with increasing temperature. However, with an increase of temperature, the absorption of TMAl increases rapidly and the absorption extends towards longer wavelengths, reflecting dissociation of the dimer into monomer at higher temperatures. A simple molecular orbital model by Walsh is used to interpret the UV spectra of these metal alkyl compounds.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.347219
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