Abstract
We present the threshold photoelectron spectroscopy of the imidogen radical (NH) recorded in the photon energy region up to 1eV above its first ionization threshold. The radical was produced by reaction of NH3 and F in a microwave discharge flow-tube and photoionized using vacuum ultraviolet (VUV) synchrotron radiation. A double imaging coincidence spectrometer was used to record mass-selected spectra and avoid contributions from the byproducts present in the reactor and background gas. The energy region includes the ground X+2Π and first electronically excited a+4Σ− states of NH+. Strong adiabatic transitions and weak vibrational progressions up to v+=2 are observed for both electronic states. The rotational profile seen in the origin band has been modeled using existing neutral and cationic spectroscopic constants leading to a precise determination of the adiabatic ionization energy at 13.480±0.002eV.
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