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The preci e measurement of infrared absorp tion sp ectra has been accomplish ed by using the " "hi te-light frin ges of a Fabry-Perot interferometer in conjunctie n w ith atomic sp cctrall in es. \\Tayelengths from the first spectra of neon, argon, krypton, a nd xenon were uscd for calibrating t he fringcs. The absorption spectra and the fringe systcm ar e reco rded simultaneously by a two-pen r ecorder. One pen records t he higher orders of the frin ge system of visible ligh t as detected by a IP28 photomultiplier. The other p en r ecords the infrared a bsorption p ec trulll, which is detected by a PbTe cell. A measurement of t he distance from the ce nter of the absorption line to t he neighboring maxima of t he fringe system d etermi nes t he line pos ition to a high precision. ' Vavelengths of infrared Jines can bc rn easured with a n error of one part i n 500,000. Eight infl'arcd lines of mercury, seventeen lines of krypton, and fi ' "C lines of xeno n have been measured by this method. Tablcs are g iven of v is ible a nd in frared lin es of the noble gases, which are useful for calibration.

Su ita ble ba nd of co mmon "a 'es have bee n tabulated and remeasured wh ereve r I\ ecessary from 2 to 16 microns to obtain a n accuracy of a bou t 0.03 cm-L t hroug hou t the re"ion an d to provide good calibrating poin t at fr eq uent intervals. So me 600 rotation-vibration l in es ar e illustrated in 20 spectrograms a nd wave numbers are listed in co mpa nion tables wi t h considerable in te rco mpa rison with worthy d ata obtain ed in other labo rato ri es. The a bsol'potion bands were remeasLIl'ed o r calibrated by usin g eith er a prec isely graduated gratin g circle or stal\da rd ato mi c lin es with t he frin ge system form ed by a F a b ry-P erot interf erometer . Characte ri stic featnres of t he individual ba nds are d iscu ssed bri efly and refere nces to other publi cations are g iv en . Th e su bstances used fo r calibration in clud e H 2 0, CO" CO, H Cl, HBr, N H 3, C2H2, CH., N2 0, a nd polysty rene film .

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