July 31, 1950 - Linus Pauling Day-by-Day

Check from AHP to George Taguchi for $24.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]

Check from LP to Sidney Weinbaum for $200.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]

Check from LP to State Department of Motor Vehicles for $16.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]

Invoice from the Paddock Pool Maintenance Co. to Linda Pauling: Informs her that pool service for July costed $27.50. Handwritten note indicates that it was paid August 15th. [Filed under LP Biographical: Business and Financial: (Assorted Bills, Receipts and Invoices, 1945-1950.), Box #4.059, Folder #59.3]

Letter from Frederic Joliot-Curie, President, Committee of the World Congress of the Defenders of Peace, to LP RE: Asks LP to sign an appeal demanding the prohibition of atomic weapons and the establishment of international control to ensure such prohibition. Invites LP to take part in the next meeting of the Bureau of the World Committee of the Defenders of Peace in Prague, August 16-17, 1950. [Filed under LP Correspondence: (Joliot-Curie, Frederic), #190.3]

Letter from LP to David Pressman, Sloan-Kettering Institute for Cancer Research, RE: Encloses the revised draft of the azophtalate paper and relates his changes. Discusses other matters related to this manuscript. [Filed under LP Correspondence: (Pressman, David), #309.7]

Letter from LP to Dr. O. Edward Kurt, Secretary of the Ethyl Fellowship Committee, Ethyl Corporation, cc. Lacey Niemann, Green, and Shoemaker, RE: Explains that they are pleased that the Ethyl Fellowship will be made available during the coming year. [Letter from Kurt to LP, July 27, 1950] [Filed under LP Correspondence: (Shoemaker, David P.), #362.3]

Letter from LP to L. H. Long, Washington Singer Laboratories, University College of the Southwest of England, RE: Relates his comments on Long’s paper, “This dissociation energy of CO, CN and N2. Long’s paper is attached. [Filed under LP Correspondence: (L: Correspondence, 1950), #230.16]

Letter from LP to President DuBridge, California Institute of Technology, RE: Makes some suggestions concerning the handling of communication to local boards and appeal boards about draft deferment. [Filed under LP Correspondence: (DuBridge, Lee A.), #96.16]

Letter from W.H. Freeman to LP RE: Informs him that since Ernest Swift will be away during mid-August, he will not get to Pasadena again until the last week of August or the early part of September. [Filed under LP Books: 1950b.2]

Memo from LP to Dean Lacey, cc. Niemann and Shoemaker, RE: Requests that the leave of absence for Mr. Robert Smith be extended for another year since he is still in the hospital. [Filed under LP Correspondence: (Shoemaker, David P.), #363.3]

Memorandum from LP to Dr. Fred Ewing. [Filed under LP Correspondence: (Ewing, Fred), #110.5 and LP Science: (Materials re: Electron Theory and the Structure of Metals and Intermetallic Compounds, 1950-1955), Box #5.003, Folder #3.6]

CALIFORNIA INSTITUTE OF TECHNOLOGY

July 31, 1950

TO Dr. Ewing

SUBJECT __Cu₁₅Si₄ and related substances

I note that on the reprint about Cu₁₅Si₄ you have made a note that the plane 640, which reflects strongly, corresponds to 375 electrons per unit. Would you verify this for me. Also the planes 552 and 633 are indicated as reflecting rather strongly. Would you check to see whether they truncate 640 or not.

You have noted that the normal valences for copper and silicon would lead to 390 electrons - with 5 1/2 for copper the number is 394. Now the electronegativity values might decrease the number of valence electrons. Copper is more electronegative than silicon, so that the silicon-copper bonds would tend to transfer electrons from silicon to copper. This electron transfer would, however, tend to be counterbalanced by an actual transfer of valence electrons, which would, contrary to what I have just said, increase the valences of both copper and silicon. However, perhaps the effect is only a small one; and it is possible that the valence of copper is, in this compound, somewhat less than the normal 5 l/2. It would have to be about 5 l/5 to give 375 valence electrons.

The strongest reflection is from 332. Would you tell me what the electron number is for this plane? I think that it may be of importance in stabilizing the compound Na₁₅Pb₄, which has the same structure. If lead has valency 2, Na₁₅Pb₄ would contain 92 valence electrons per unit cube. However, there probably is some electron transfer which might increase this number by as much as 16.

Linus Pauling:W

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