Abstract
Double resonance measurements on 15NH3 in a free expansion jet are reported. These were carried out using a continuous wave (CW) CO2 laser and a pulsed ultraviolet (UV) laser system. Infrared radiation was used to prepare molecules in individual rotational levels of the v2=1 vibrational state of the electronic ground state of [15N]ammonia. These molecules were the photoionized via transitions of the [Ctilde]-[Xtilde] band in a (2+1) process using the doubled output of a pulsed dye laser. The ion signal was detected using a time of flight mass spectrometer. Two known coincidences between CO2 laser lines and individual rovibrational transitions of 15NH3 were used to populate the (J, K)=(5, 4) and (3, 0) symmetric levels of v2=1. Double resonance signals corresponding to O, P, Q, R, and S branch two photon transitions in the [Ctilde]-[Xtilde] band were observed and measured accurately. These data were augmented by conventional (2+1) REMPI measurements on the 20/0, 20/1, and 20/2 sub-bands of 15NH3: A complet...
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