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.

The infrared absorp tion spectra of m eth ano l, ethanol, a nd n-propanol have bee n measured wi th prism instruments. Studies have bce n made of the vapors and of several dilu te solu tio ns. Th e m ethanol spectra, betwee n 2 to 15 mi cron s, provided a direct comparison w ith t he other two alcohols and co nfirmed earli er wo rk on t h e cxistence of a number of lowintensity bands. The two other a lcohol s were studied from 2 to 36 mi crons. T he ?ands have been class ified in relation to the O-H , C-H , CO , a nd CC vibratIOn s wlthlll th e molecules. The long-wave absorption , in the region beyond 30 mi crons, for each alcohol, is att ribu ted to t he hindered rotation of OH. Th e ob ject of t he present stud y was to confirm t he ass ig nmen ts for m ethanol and to stud y and assign th e vibrat ional spectra of ethanol and n-propan ol.

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.

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.