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Advances in Chemical Physics [Vol 10 - Molecular Beams] by I. Prigogine

By I. Prigogine

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London), A73, 455 (1959). 8. R. Sternheimer, Phys. , %, 951 (1954). 9. Dalgarno, Advan. Ground-state polarizabilities of the helium isoelectronic sequence have been calculated, using the fully coupled Hartree-Fock approximation, by A. Dalgarno and J. M. , Proc. Phys. ,77,673 (1961). The method has recently been extended to the beryllium sequence by A. Dalgarno and H. A. J. Mclntyre, Proc. Phys. , 85,47 (1965). 10. J. Hirschfelder, C. F. Curtiss, and R. B. Bird, Molecular Theory ofLiquids and Gases, Wiley, New York, 1954.

A &in. copper tube, 7, connects the scattering chamber through a valve to a diffusion pump, or, when a valve is shut, to a McLeod gage. 58 I. AMDUR AND J. E. JORDAN Gas is introduced into the scattering chamber through a &-in. tube, 8, suspended coaxially in the +in. tube. The temperature of the scattering gas is measured with a thermocouple attached to the scattering chamber. The scattering pressure is measured with a Pirani gage which is attached to the bottom plate of the chamber and calibrated against a McLeod gage.

References .......................................................... . . . 29 31 33 33 35 35 47 50 53 54 57 57 59 62 68 70 71 . I INTRODUCTION The elastic scattering of high-velocity neutral beams has proven to be a useful method for determining interaction potentials at small internuclear separations . This chapter will critically discuss the experimental and theoretical aspects of such scattering and the reliability of the derived potentials . It will also discuss applications to specific problems where it is necessary to have a quantitative description of the intermolecular potential .

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