LAMBDA-SPLITTINGS AND LINE-INTENSITIES IN THE 2[-1 HOT-BAND OF NITRIC-OXIDE

Using Fourier transform spectra, A-splittings and absolute line intens ities have been measured in the 2PI1/2-2PI1/2 and 2PI3/2-2PI3/2 allowe d subbands of the vibrational 2 <-- 1 hot band of nitric oxide. To ret rieve accurate results from the spectra, LAMBDA-doubling and hyperfine splittings were carefully taken into account. However, for most of th e studied lines, it turned out that the components of the hyperfine st ructure are close enough so that they have no susceptible effects on t he measured line parameters. Well-chosen cases illustrate the method o f measurement. The observed LAMBDA-splittings have been compared with the values deduced from the transition wavenumbers available in the HI TRAN database, and large discrepancies (up to 0.006 cm-1 for P(22.5)) appeared for the 2PI3/2-2PI3/2 subband. The measured line intensities led to the determination of the transition dipole moment as well as th e Herman-Wallis coefficients for the studied hot band. Our measured in tensities have been found to be larger than the HITRAN values by about 7%.