Abstract
The combined application of the ac discharge velocity modulation technique with cw tunable difference frequency infrared generation and dual beam subtraction of laser amplitude noise produces an extremely sensitive (10−6 absorbance/Hz1/2) direct absorption method for observing vibrational spectra of molecular ions. In this study we report observation of the fundamental ν1 (D–N stretch) of DNN+ in both P and R branches from J=0 to 24, as well as the 30-fold weaker hot band transitions originating from the (0110) bending state. l-doubling in these latter transitions is measured interferometrically with a precision of ±10 MHz. Spectroscopic constants for (0000), (1000), (0110), and (1110) states are reported and compared with ab initio calculations and previous microwave measurements for DNN+.
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