Semi-Annual Report: October 15, 1961

Investigations are proposed involving an experimental and theoretical program designed to investigate various properties of the structure of helium both in its atomic form and in the aggregates of the liquid and solid states. The key to the possibilities of performing the experiments lies in the relatively weak electric fields existing in liquid and solid helium and the possibility of producing external fields almost comparable with the internal fields. It is proposed to examine a) the melting pressure curve for helium as a function of electric field b) the dielectric constant of helium as a function of pressure and electric field c) in future, the effect of electric fields on the lambda transition. From the results of these experiments one would expect to be able to gather at least corroborative evidence on a) the crystal structure of solid helium on b) the effect of the Van der Waal interaction of the electric polarizability of helium, c) the possibility of producing helium molecules d) the effective volume available to helium atoms in the liquid and possibly e) the effect of particle interactions on the Bose-Einstein condensation

Saturation in “nonmagnetic” stainless steel

Scientific equipment often uses “nonmagnetic” stainless steel, relying on the steel’s nonmagnetic behavior to leave external magnetic fields unaltered. However, stainless steel’s permeability can rise significantly when it is welded or machined, possibly perturbing an external field. Such perturbations will diminish well above the stainless steel’s saturation point. The authors measured the permeability of both welded and machined 304 stainless steel as a function of an external magnetic field, and found that both saturate at fields of approximately 0.25 T

Molar Volume, Refraction and Interionic Forces

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70588/2/JCPSA6-9-3-282-1.pd

Erratum: Discontinuous Change of Binding Type in the Series of Monohydrides. II. Place of Discontinuity

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69666/2/JCPSA6-42-10-3742-3.pd

Discontinuous Change of Binding Type in the Series of Monohydrides. III. Regularities and Irregularities of Internuclear Distances and Force Constants

The recently attempted correlation of internuclear distances of the monohydrides of all elements by linear plots of logr vs logZ (atomic number) for each of the two octaves and of the three long periods is not satisfactory. The equations re=2.2240 n−0.426 and r0=2.7793 n−0.371 (n is the total number of valence electrons in the hydride) apply merely from HF to BH and from HCl to AlH, respectively. The marked deviations from these equations shown by the hydrides M (I) H and M (II) H are related to a discontinuous change of binding type. In the long periods, r increases for the hydrides of the heavy metals from M (I) H to M (III) H, due to the decrease of polarizability and penetrability of the cations with an 18‐electron (s2p6d10) outer shell, e.g., from AgH to InH. It is emphasized that the knowledge of spectroscopic data for molecule ions of the hydrides of long period elements is necessary in order to decide at which places discontinuous changes of binding type occur.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70893/2/JCPSA6-43-7-2159-1.pd

Difficulties in the Valence Bond Theory

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70689/2/JCPSA6-10-12-760-1.pd

Discontinuous Change of Binding Type in the Series of Monohydrides

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69596/2/JCPSA6-40-6-1773-3.pd