Application of fitting laws to rotationally inelastic rate constants: Li/sub 2/

Journal Article · Tue May 15 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:7187253

Scott, T P; Smith, N; Pritchard, D E

Using the method of LIF we have measured with an average absolute error of 8% rate constants for rotationally inelastic collisions from level j/sub i/ = 8, 22, and 42 to level j/sub f/ = j/sub i/+..delta..j for Li(/sub 2/ (A..sigma..) colliding with Xe, Ar, and Ne. Values of Vertical Bar..delta..jVertical Bar up to 32 were studied, involving rotational energy charges as large as 1.5 kT and collisions during which the Li/sub 2/ molecule rotated as much as 3 rad. These extremes are several times larger than the corresponding values in any previous experimental studies of rotationally inelastic collisions, and present a formidable challenge both to the experimental technique and to any general relationships used to fit the data. Four parameter fits with average deviation from the data of 11% have been found; these fits combine the energy corrected sudden approximation of DePristo et al. with our recently proposed power law-exponential expression for the basis rates k/sub j/..-->..0 .

• Research Organization: Research Laboratory of Electronics and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 7187253
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
DIMERS
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GASES
KINETICS
LITHIUM
METALS
MOLECULE COLLISIONS
NEON
NONMETALS
RARE GASES
ROTATIONAL STATES
SUDDEN APPROXIMATION
XENON