Measurements of the electric dipole tensor polarizabilities of the alkali dimers: Na[sub 2], Cs[sub 2]

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7263490

Bunimovicz, M

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
• Country of Publication: United States
• Language: English

Related Subjects

664400* -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ALKALINE EARTH METALS
CESIUM
CHEMICAL REACTIONS
DIMERIZATION
DIPOLES
ELECTRIC DIPOLES
ELECTRICAL PROPERTIES
ELEMENTS
METALS
MULTIPOLES
PHYSICAL PROPERTIES
POLARIZABILITY
POLYMERIZATION
SODIUM
STRONTIUM