Crossed molecular beams kinetics: SnI and SnCl recoil velocity spectra from Sn+CH/sub 3/I,n-C/sub 3/H/sub 7/I, and CCl/sub 4/ and a lower limit for D/sup 0//sub 0/(SnI)
Laboratory (LAB) angular and time-of-flight (TOF) recoil velocity spectra of SnI and SnCl products formed by crossing an effusive Sn beam with CH/sub 3/I, n-C/sub 3/H/sub 7/I, and CCl/sub 4/ nozzle beams have been measured in a molecular beam apparatus equipped with an electron bombardment ionizer--quadrupole mass filter detector unit. Product center of mass (c.m.) recoil angle and energy distributions have been fit to the data by convoluting the c.m...-->..LAB transformation equations over measured speed distributions for both beams and the instrumental TOF response function. The Sn+CH/sub 3/I and n-C/sub 3/H/sub 7/I reactions proceed via a direct interaction mechanism which favors scattering of SnI into the backward c.m. hemisphere (backward scattering denotes a reversal in Sn-atom direction during the reactive encounter). The SnCl from Sn+CCl/sub 4/ is scattered predominantly sideways, probably also via a direct reaction mechanism. The Sn+CH/sub 3/I reaction produces a more sharply backward peaked SnI c.m. product angular distribution with higher product recoil energies than does the Sn+n-C/sub 3/H/sub 7/I reaction. All of these reaction characteristics are strikingly similar to the best experimental information which is available for the analogous alkali atom reactions. Qualitative observations are also reported on the relative reactivities of Sn with CH/sub 3/I,n-C/sub 3/H/sub 7/I, CCl/sub 4/,i-C/sub 3/H/sub 7/I, CH/sub 3/Br, CF/sub 3/Br, C/sub 2/Cl/sub 4/, and SF/sub 6/. A rigorous lower limit for the Sn--I bond energy is also established, D/sup 0//sub 0/(SnI) > or =230 kJ/mole.
- Research Organization:
- Ames Laboratory--USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011
- OSTI ID:
- 6733638
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 69:6; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CARBON TETRACHLORIDE
CHEMICAL REACTION KINETICS
CHLORIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE COMPOUNDS
COLLIDING BEAMS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
IODIDES
IODINATED ALIPHATIC HYDROCARBONS
IODINE COMPOUNDS
KINETICS
METALS
METHYL IODIDE
MOLECULAR BEAMS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
REACTION KINETICS
RECOILS
TIME-OF-FLIGHT METHOD
TIN
TIN CHLORIDES
TIN COMPOUNDS
TIN HALIDES
TIN IODIDES
VELOCITY