Spectra of heavy water have been obtained under high resolution between 1.25—4.1μ (2400—8000 cm—1). Approximately 4500 lines have been measured, and the majority of them analyzed into ten bands of D2O and nine bands of HDO. The analysis is described in some detail, spectra of all bands are shown and a partial table of lines and a complete table of energy levels are presented. The vibration-rotation constants are derived and compared with those of H2O.

A summary is given of molecular constants for NH3 and ND3, as derived from high-resolution infrared spectra of a number of fundamental, overtone, and combination bands. Preliminary estimates are given for the equilibrium moments of inertia, the molecular dimensions, and the force constants of the harmonic potential function. The average molecular dimensions in the equilibrium configuration are re = 1.0116 × 10−8 cm., he = 0.381 × 10−8 cm.

19. Dr. Weidlein has been prominently and actively identified with the Institute for over 40 years, serving as a senior fellow 1912-t6, and then as an executive staff member from 1916 to 1951, when he was made President. He is noted internationally as a scientist, research administrator, and author. Following his retirement he will spend several months in Europe on a Federal Government mission. Dr. Weidlein will continue to serve the Institute as a member of the Board of Trustees and will be available in an advisory capacity in the administration of research programs.ALBERT H. COOPER has joined the American Hard Rubber Co., New York City, as assistant to W. M. Bergin, Director of Research & Development. A well-known authority on organic and inorganic chemicals, Dr. Cooper will devote the major part of his time to furthering American's accelerated chemical research and allied production programs. He is the owner and manager of Pilot Engineering Co., industrial consultants on plant design and production problems; he also is head of the Dept. of Chemical Engineering at Pratt Institute in Brooklyn. J. J. LANDER has resigned as chemist with the Naval Research Lab., Washington, D. C., to assume the position of Director of Research of the Storage Battery Division, Electric Auto-Lite Co., Toledo, Ohio. J. S. DEWAR recently was promoted to President of National Carbon Co. Ltd., Toronto, Ont., Canada. He has the distinction of being the youngest chief executive in the history of the company.

No abstract

In order to s t ud y how the vibratio nal freq uenci es of methane vary with haloge n substit utions, the infrared spectra of the following halo g~n-s ub stit u te d methanes . have been st udied with a prism spectrometer between 2 and 38 mICrons: Carbon tetraflu onde, chlorot rifiuoromethan e dichlorodifiuoromethane trichlorofiuorom ethane, car bo n tet rach lorid e, trichlorobromom~than e, dichlorodibromol~ethane , fiuoroform, di~uoroch l o romet h an e, dichlorofluoromethane chloroform di chlorobromomethane, chlorodlbromomethalle , bromoform , iodoform, me th ylene flu orid e, methylene. chloride, and m~th~l ene iodide. Spectra are prese nted as obtained at room temperature ll1 t he vapor and lIquid states, an d l.n a f ew cases in sol ut ion. The bands are interpreted as fundam entals, overtones, combmatlO n, and differe nce bands. Tables and grap hs display t he regularities existing among t he various fundam entals of these molecules and other haloge n-subst ituted methanes. Force-constant calculat ions, using an approximate potential function with ge neral constants transferred from one molec ul e to another a re reported.