Infrared Laser Spectroscopy Of The Nu(3)-Nu(4) Difference Band And Detection Of The Nu(3) Band Of No3

The infrared diode laser spectrum of the nu(3)-nu(4) difference band of (NO3)-N-14 has been observed in the 690 cm(-1) region. By fixing the lower state (v(4) = 1) constants to the previously determined values , molecular constants in v(3) = 1 have been determined for the first time : the vibrational energ y E-3 = 1054.13679(69) cm(-1), the rotational constants B-3 = 0.4562291(41) , C-3 = 0.2274567(53) cm(-1) , the first-order Coriolis coupling constant C zeta(3) = 0.0032073(99) cm(-1), and the spin-orbit interaction constant a(eff) = -0.03979(70) cm(-1), with one standard deviation in parentheses. The nu(3) fundamental band has been detected with weaker intensity than the nu(3) + nu(4) band by a factor of similar to 2000.