Measurements of the electric dipole tensor polarizabilities of the alkali dimers: Na[sub 2], Cs[sub 2]
Molecular beam inhomogeneous electric field spatial deflection measurements of the static effective average electric dipole polarizability [alpha] = 1/3(2[alpha][sub xx] + [alpha][sub zz]) and polarizability anisotropy [gamma] = ([alpha][sub xx] - [alpha][sub zz]) (where [alpha][sub xx] and [alpha][sub zz] are the two independent tensor polarizability components which define the polarizability tensor of the alkali dimer molecule), are reported for the homonuclear alkali dimers Na[sub 2] and Cs[sub 2]. A general three dimensional (in space) molecular beam deflection calculation has been developed in which all experimental parameters are taken into account, using a model in which the axially symmetric dimers are treated as linear rigid rotator molecules interacting with an applied external E field. The data analysis consists of a two independent parameter ([alpha][sub xx], [alpha][sub zz]) least square best fit computed to experimentally measured spatial beam intensity deflection curves. The results are normalized to the standard known scalar polarizabilities of the atomic monomers Na, Cs. The measured average polarizabilities, and polarizability anisotropies in units of ([angstrom][sup 3]) are: Na[sub 2] (T = 660K): [alpha] = 31.0[+-]1.7, [gamma] = 0[+-]2, Cs[sub 2](T = 500K): [alpha] = 82.4[+-]6.2, [gamma] = 0[+-]6. All monomer and dimer analysis sets clearly indicate that the beams indeed possess Maxwell-Boltzmann velocity distributions. In addition remeasurements of the average electric dipole polarizabilities of atomic strontium, using the above full curve fit analysis yields Sr(T = 500K): [alpha] = 24.7[+-]1.5 [angstrom][sup 3], and for the alkali halide dimers in units of [angstrom][sup 3]: (CsF)[sub 2](T = 835K): [alpha] = 27.6[+-]3.1, (CsCl)[sub 2](T = 844K): [alpha] = 52.1[+-]5.9, using the linear peak deflection analysis method.
- Research Organization:
- New York Univ., NY (United States)
- OSTI ID:
- 7263490
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Measurements of the electric dipole polarizabilities of the alkali halide dimers
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Related Subjects
CESIUM
DIMERIZATION
ELECTRIC DIPOLES
POLARIZABILITY
SODIUM
STRONTIUM
ALKALI METALS
ALKALINE EARTH METALS
CHEMICAL REACTIONS
DIPOLES
ELECTRICAL PROPERTIES
ELEMENTS
METALS
MULTIPOLES
PHYSICAL PROPERTIES
POLYMERIZATION
664400* - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)