Silicon atom recoil reactions with

However, we have found several products that are consistent with some participation by ion-molecule reactions in product formation. The reactions of recoiling silicon atoms in mixtures of phosphine and tri-methylsilane produce some provocative minor products (26). 

We were faced with a dilemma six years ago when the major product from reactions of recoiling silicon atoms with butadiene turned out to be one for which no authentic sample could be synthesized (4,39). 

A natural area of interest for chemists studying high-energy polyvalent atoms is cosmochemistry. With growing indications that high-energy reactions of carbon and silicon atoms are important processes in the formation of interstellar grains, it can be predicted with confidence that the recoil chemistry of polyvalent atoms will claim the attention of cosmochemists and laboratory astrophysicists (129-133). 

For the Si( ,y) Si reaction, silicon atoms with 75-750-eV recoil energy are formed. Owing to the low recoil energy, both the bond rupture in the transmuted precursor molecule and the charge neutralization of Si ions may be incomplete. However, this process has the advantage that a phosphorus-containing precursor is not required to be present in the reaction mixture. 

Phosphorus. Silicon. The reaction of PH3 with recoil P atoms (from the irradiation of PH3 with thermal neutrons) yields considerable quantities of PH3 via H abstraction details are given in Section 1.3.1.5.1.5, p. 215. The measured relative efficiency of the H abstraction in irradiated PH3 and PF3 was used to consider the likely reaction mechanism in [65]. A reaction of PH3 (from adding Ca3P2 to the solution) with recoil was also considered in order to explain the formation of 30 10% of when KCl crystals [66] or KCl-CaCl2 mixed crystals [67, 68] were irradiated with protons (635 to 660 MeV) and dissolved in water. The H abstraction between and PH3 might have occurred at the surface of the dissolving crystals however, a formation of PH by secondary reactions was also considered to be conceivable [66 to 68]. 

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