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Electron and Ion Reactions With Hexamethyldisiloxane and Pentamethyldisiloxane

Electron and Ion Reactions With Hexamethyldisiloxane and Pentamethyldisiloxane

S Carles, J L Le Garrec, J B A Mitchell

J Chem Phys. 2007 Oct 14;127(14):144308.

PMID: 17935396

Abstract:

The dissociative recombination of electrons with the hexamethyldisiloxane (HMDSO) cation ((CH(3))(3)Si-O-Si(CH(3))(3))(+) and the pentamethyldisiloxane cation ((CH(3))(3)Si-O-Si(CH(2))(2))(+) as well as the ion-molecule reaction between Ar(+) and HMDSO have been studied at 300 K using a flowing afterglow Langmuir probe-mass spectrometer apparatus. The rate constants for these reactions, measured directly for the first time, are, respectively, alpha(1)=1.8 x 10(-6), alpha(2)=3.6 x 10(-6) cm(3)s, and k=2.0 x 10(-9) cm(3)s with uncertainties of +/-30%. In addition, the electronic attachment to neutral HMDSO was also studied and an upper limit value of the rate constant was determined to be beta=3.3 x 10(-11) cm(3)s.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1438820	Pentamethyldisiloxane		1438-82-0	Price

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