Abstract
The first double resonance signals involving the use of a c.w. infrared laser and multiphoton ionization Spectroscopy using a pulsed UV laser has been observed in 15NH3. Despite the low duty-cycle of such a combination, very strong double resonance signals were observed using a low power CO2 laser as infrared source. The observations indicate that such measurements should be possible with the extremely low power levels available from tunable diode lasers. Such a combination would allow high resolution infrared Spectroscopy to be carried out with the sensitivity of ionization Spectroscopy and allow application to molecular species such as clusters. Term values of 15NH3 have been calculated from the data.
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