Infrared spectra of liquid and solid DT and T2 a)

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Abstract
The fundamental vibration–rotation spectra of condensed DT and T2 were measured. The 24 separate spectral lines identified consist mainly of QQ, QR, QQ+So(0), and QQ+So(1) transitions. The last two appear as triad sets in D2–DT–T2 solutions because of double transitions between different isotopes. The QQ frequencies are 2458 cm−1 for T2 and 2736 cm−1 for DT. Some approximate kinetic half‐times have been measured. In the 21 K liquid, these include: 18 h for the reaction of D2+T2→2DT and 25 h for the T2 rotational J=1 to J=0 conversion. In solid T2 at 20 K, the J=1 to J=0 conversion time is also about one day, but it is only 1 h at 4 K. Catalysis by atomic tritium is considered to be the cause of the fast 4 K‐conversion time.

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