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>A study of the ngr;1fundamental and bendhyphen;excited hot band of DNN+by velocity modulation absorption spectroscopy with an infrared difference frequency laser
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A study of the ngr;1fundamental and bendhyphen;excited hot band of DNN+by velocity modulation absorption spectroscopy with an infrared difference frequency laser
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机译：A study of the ngr;1fundamental and bendhyphen;excited hot band of DNN+by velocity modulation absorption spectroscopy with an infrared difference frequency laser
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 (10minus;6absorbance/Hz1/2) direct absorption method for observing vibrational spectra of molecular ions. In this study we report observation of the fundamental ngr;1(Dndash;N stretch) of DNN+in bothPandRbranches fromJ=0 to 24, as well as the 30hyphen;fold weaker hot band transitions originating from the (0110) bending state.lhyphen;doubling in these latter transitions is measured interferometrically with a precision of plusmn;10 MHz. Spectroscopic constants for (0000), (1000), (0110), and (1110) states are reported and compared withabinitio calculations and previous microwave measurements for DNN+.
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