Recent Research in Molecular Beams by Immanuel Estermann

By Immanuel Estermann

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Phys. Soc. II, 2, 383 (1957); E. Lipworth, H. L. Garvin, and T. M. Green, Bull. Am. Phys. Soc. II, 2, 344 (1957); Hugh L. Garvin, Thomas M. Green, and Edgar Lipworth, Bull Am. Phys. Soc. II, 2, 344 (1957). 15 W. A. Nierenberg, A Method for Minimizing a Function of n Variables, UCRL-3816 (1957). , 16 Hubbs, Marrus, Nierenberg, and Worcester, Bull. Am. Phys. Soc. II, 2, 316 (1957); Hubbs, Marrus, Nierenberg, and Worcester, Phys. Rev. 109,390 (1958). 3 Velocity Distributions in Potassium Molecular Beams* P.

MARCUS A N D J . H. MCFEE REFERENCES 1. A. I. Bennett and I. Estermann, "Distribution of Velocities in Molecular Beams of Potassium", (Doctoral Dissertation, Carnegie Institute of Technology, 1953). 2. R. C. Miller and P. Kusch, Velocity Distributions in Potassium and Thallium Atomic Beams, Phys. Rev. 99, 1314 (1955). 3. A. I. Bennett, The Phase-Shift Velocity Selector (to be published). 4. N. F. Ramsey, "Molecular Beams", Oxford 1956. 5. I. Estermann, O. C. Simpson, and O. Stern, The Free Fall of Atoms and the Measurement of the Velocity Distribution in a Molecular Beam of Cesium Atoms, Phys.

Reduced shutter functions vs. reduced transit time. S = (S/T0) ideal shutter function. S*> = (Sw/To) shutter function averaged over angular spread of beam. Sd = (Sd/To) shutter function corrected for disc thickness. 62 P. M. MARCUS AND J. H. 66, corresponding to the peak) w _ M 1 . 5 2. Effects of Finite Disc Thickness The thickness d of the velocity selector discs decreases the effective open time of both entrance and exit slots for molecules of transit-time T from β to ß —(dTß). Thus (l/T) is the velocity of a molecule of transittime Γ, hence it must enter one side of the slot at least a time dl(l/T) before the slot closes to clear the other side.

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