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The picosecond predissociation dynamics of vibronic levels of the B and e’ Rydberg states of ammonia have been investigated in real time by (2 + 1’) two-color pump-probe ionization in combination with photoelectron spectroscopy. The picosecond real-time results are in reasonable agreement with the results obtained from indirect methods using nanosecond excitation. These indirect methods include investigations of the peak intensities and the natural line widths of the rotational lines in the excitation spectra. The photoelectron spectra obtained for (2 + 1) ionization via the B state in NH3 and ND3 are interpreted and shown to allow for an accurate determination of hitherto unknown vibrational frequencies in the ground state of NH3’ (ND3+). For the VI symmetric stretch a frequency of 0.404 f 0.007 eV (0.304 f 0.007 eV) is found, while the frequency of the v4 asymmetric bend vibration has been established as 0.197 f 0.007 eV (0.141 f 0.007 eV). The hydrogen atom fragment, which results from the predissociation of the B and e’ Rydberg states, has been detected in a two-color pump-probe experiment using nanosecond excitation.

the journal of physical chemistry

Two-Color Picosecond Time-Resolved (2 + 1') Resonance-Enhanced Multiphoton Ionization Photoelectron Spectroscopy on the B1E'' and C' 1A1' States of Ammonia