Knowledge Bank

We have recorded the $\nu 4$ band (Herzberg numbering) of benzene $1,3,5-d3$ using high resolution $(0.0015cm-1)$ Fourier transform infrared spectroscopy. The spectrum was taken with the benzene sample in a temperature stabilized cell $(4\circ C)$, 20 cm in length. The interferometer used a mylar beamsplitter and the spectrum was recorded with a liquid helium-cooled silicon bolometer. For the band we have fit the following preliminary spectroscopic constants: $\nu 0=531.06401(1)cm-1,B\prime =0.171542(2)cm-1,(C\prime -B\prime )-(c\prime \prime -B\prime \prime )=3.48(2)\times 10-4cm-1,B\prime \prime =0.171842(3)cm-1$. Band centers of the observed sequences of hot bands will be reported.