Knowledge Bank

The high resolution spectrum of the C-O stretching band of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CH$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$OH has been obtained in the $950-1100cm-1$ region at $0.004cm-1$ resolution using a Bomem Fourier transform spectrometer. Many intense P and R branches have been assigned for K values up to 7 and J values up to about 35 in the $vt=0$ torsional ground state. The strong Q branch region around $1018cm-1$ is very crowded, but series of lines can be followed up to reasonable J values. Progress is also anticipated toward assignment of absorption lines in torsionally excited states. The $vt=0$ assignments were based primarily on ground state combination differences calculated using molecular parameters reported from microwave measurements. The P and R branch frequencies have been fitted to a simplified model in which the energy levels are expressed as series in powers of J(J+1). The results will be discussed in terms of effective state-dependent molecular parameters. In addition, comments will be made on assignment of far infrared laser lines in the excited C-O stretch state.