February 16, 1968
Dr. Gustav Albrecht
271 East Loma Alta Drive
Altadena, California 91001
Dear Gus:
I have started doing some work on covalent radii, and need some help from you.
I need Xerox copies of some papers. One is Ollred and Rochow, Journal of Inorganic and Nuclear Chemistry, 5, 26H, 269 (1958). Another is Little and Jones, Journal of Chemical Education, 37, 231 (1960).
Also, I want to check up on page 231 of The Nature of the- Chemical Bond. I have a note in my volume to the effect that D. Cubicciotti has given values of constants in Table 7-7 to the first four values for a that I give. I have given 2.32 for each of these four. I may have made a mistake in copying the values given by Badger, reference at the foot of the page. I do not know whether Cubicciotti wrote me a letter or whether he published a paper. Would you look in the literature (Chemical Abstracts) for the period around 1960, to see whether Cubicciotti has written something about force constants in diatomic molecules, and send me a Xerox if he has. Also check up on the values as given by Badger, to see whether I made a mistake.
There is another job of searching the literature that I should like you to do. I am comparing the observed bond lengths (re) for pairs of molecules such as HC1 and (HC1)+. I have got values from the table in the second edition of Herzberg's book on Molecular Spectroscopy, Diatomic Molecules. I should like you to go through Chemical Abstracts (which probably covers the field) for the last ten years, to see if you can find values of the bond lengths for singly ionized hydrides (also the neutral molecules, several of which are given by Herzberg) of fluorine (HF)+), iodine, sulfur, arsenic, antimony, silicon, germanium, tin, and any other diatomic hydride molecules in the singly ionized state. I am especially interested to have singly ionized hydrogen fluoride, also hydrogen iodide.
I am looking forward to giving my lectures at UCLA, beginning 26 February.
Sincerely,
Linus Pauling
February
16, 1968
