Resonance-enhanced multiphoton ionization photoelectron spectroscopy of Rydberg states of N2O below the X ionization limit Scheper, C.R.; Kuijt, J.; Buma, W.J.; de Lange, C.A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A three-photon resonance-enhanced multiphoton ionization spectroscopic study on N 2 O is carried out in the spectral range from 80 000 cm Ϫ1 up to the lowest ionization limit at 103 963 cm Ϫ1. High-resolution photoelectron spectroscopy is used to identify and characterize the observed excited states. Eighteen origins are reported which have either not been assigned before or are reassigned now. Moreover, the photoelectron spectra taken at higher-lying resonances often show extensive vibronic coupling with the near-resonant vibronic manifolds built on lower-lying origins.