THE FLUORESCENCE EXCITATION SPECTRUM OF DEUTERATED AMMONIA IN THE REGION 105-200-NM - THE E-STATE, F-STATE AND G-STATE OF ND3

The fluorescence excitation spectrum of a molecular beam of ND, has be en measured in the spectral region 105-200 nm using synchrotron radiat ion. The thresholds for the formation of ND (b and c) are found to be the same at 124 +/- 1 nm, indicating that ND (b) is formed by cascadin g from ND (c) and is not a primary photoproduct. A vibrational band an alysis for the ($) over tilde E, ($) over tilde F and ($) over tilde G states of ND, has been performed yielding values for the vibrational frequencies of the bending mode for the excited states of 720, 749 and 794 cm(-1), respectively. There are large violet isotopic zero band s hifts between NH3 and ND3 for these states (-247, -281 and -114 cm(-1) , respectively).