Hot atom reactions involving multivalent and univalent species. Progress report, February 1975--January 1976

Technical Report · Wed Jan 01 04:00:00 EST 1975

DOI:https://doi.org/10.2172/4155508· OSTI ID:4155508

Tang, Y. N.

Progress has been made during this period in the study of three kinds of multivalent hot atoms formed by the nuclear recoil method: $sup 31$Si, $sup 32$P, and $sup 11$C. For $sup 31$Si recoil reactions, effects of additives on the reactions of monomeric $sup 31$SiF$sub 2$ with 1,3-butadiene were studied. It was concluded that recoil $sup 31$Si reactions with PF$sub 3$ resulted in the formation of both singlet and triplet $sup 31$SiF$sub 2$ in the ratio of 1.0:3.3. For recoil $sup 32$P reactions, a moderator study was made on the effect of He, Ne, and Ar on the $sup 32$P abstraction reactions. The reaction probability curve for the H-abstraction from PH$sub 3$ to give $sup 32$PH$sub 3$ covers an extremely wide range but has a threshold somewhat above the thermal energy range, while the reaction probability curve for the F-abstraction from PF$sub 3$ to give $sup 32$PF$sub 3$ is narrow but has a threshold in or below the thermal energy range. Mechanistic studies were made for $sup 32$P abstraction reactions with a PF$sub 3$/PCl$sub 3$ mixture. Both a single-step simultaneous abstraction and a stepwise abstraction mechanism must be present. The effect of pressure and scavenger concentration on various products observed in the recoil $sup 11$C reactions with 1,3-butadiene has been extensively studied. It is also observed that with the addition of an easily abstractable hydrogen source such as SiH$sub 4$ to the system, the acetylene-$sup 11$C yield decreases sharply while products corresponding to $sup 11$CH$sub 2$ reactions increase. (auth)

• Research Organization: Texas Agricultural and Mechanical Univ., College Station (USA). Research Foundation
• NSA Number: NSA-33-002675
• OSTI ID: 4155508
• Report Number(s): ORO--3898-27
• Country of Publication: United States
• Language: English

Related Subjects

400701* --Chemistry--Radiochemistry & Nuclear Chemistry--Hot- Atom Chemistry
BUTADIENE-- CARBON 11
BUTADIENE-- PENTADIENES-- SILICON FLUORIDES-- SILICON 31
N40410* --Chemistry--Radiochemistry & Nuclear Chemistry--Hot Atom Chemistry
RECOILS
RESEARCH PROGRAMS ARGON-- HELIUM-- NEON-- PHOSPHINES-- PHOSPHORUS FLUORIDES-- PHOSPHORUS 32