The infrared spectra of trifluoroamine oxide and its <sup>15</sup>N analogue have been measured from 4000 to 260 cm<sup>−1</sup>. Fundamental frequency assignments (based upon <i>C<sub>3v</sub></i> symmetry) made from the <sup>14</sup>N spectrum are: <i>v</i><sub>1</sub>(<i>a</i><sub>1</sub>) = 1689, <i>v</i><sub>2</sub>(<i>a</i><sub>1</sub>)= 740, <i>v</i><sub>3</sub> (<i>a</i><sub>1</sub>) = 528, <i>v</i><sub>4</sub>(<i>e</i>) = 880, and <i>v</i><sub>6</sub>(<i>e</i>) = 398 cm<sup>−1</sup>. Normal coordinate calculations support the assignment of the remaining fundamental <i>v</i><sub>5</sub>(<i>e</i>) to a band system appearing as a shoulder, about 558 cm<sup>−1</sup>, on the intense <i>v</i><sub>3</sub>(<i>a</i><sub>1</sub>) fundamental.

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