%0 Journal Article %T Photoionization spectroscopy of CH3C3N in the vacuum-ultraviolet range %+ Institut des Sciences Moléculaires d'Orsay (ISMO) %+ Synchrotron SOLEIL (SSOLEIL) %+ Laboratoire de Chimie Physique D'Orsay (LCPO) %+ Institut des Sciences Chimiques de Rennes (ISCR) %A Lamarre, N. %A Falvo, C. %A Alcaraz, C. %A Cunha de Miranda, B. %A Douin, S. %A Flütsch, A. %A Romanzin, C. %A Guillemin, J.-C. %A Boyé-Péronne, Séverine %A Gans, B. %Z We acknowledge SOLEIL for provision of synchrotron radiation facilities. This work was performed on the DESIRS beamline under proposal number 20131102. J.-C.G. thanks the Centre National d’Etudes Spatiales (CNES) for financial support. The authors acknowledge the computating facility GMPCS of the LUMAT federation (FR LUMAT 2764). The authors would also like to thank J. Lievin for useful discussions. %< avec comité de lecture %@ 0022-2852 %J Journal of Molecular Spectroscopy %I Elsevier %V 315 %P 206-216 %8 2015-03 %D 2015 %R 10.1016/j.jms.2015.03.005 %K TPES %K Dissociative photoionization %K DFT calculations %K Synchrotron radiation %K 2-Butynenitrile %K Methylcyanoacetylene %K Cyanopropyne %Z Chemical Sciences %Z Chemical Sciences/Organic chemistryJournal articles %X Using vacuum-ultraviolet (VUV) synchrotron radiation, threshold and dissociative photoionization of cyanopropyne (CH3C3N) in the gas phase have been studied from 86 000 cm−1 up to 180 000 cm−1 by recording Threshold-PhotoElectron Spectrum (TPES) and PhotoIon Yield (PIY). Ionization energies of the four lowest electronic states X̃+2E,Ã+2A1,B̃+2E and C̃+ of CH3C3N+ are derived from the TPES with a better accuracy than previously reported. The adiabatic ionization potential of CH3C3N is measured as 86872±20 cm−1. A description of the vibrational structure of these states is proposed leading to the first determination of the vibrational frequencies for most modes. The vibrational assignments of the X̃+ state are supported by density functional theory calculations. In addition, dissociative photoionization spectra have been recorded for several cationic fragments in the range 12–15.5 eV (96 790–125 000 cm−1) and they bring new information on the photophysics of CH3C3N+. Threshold energies for the cationic dissociative channels leading to CH2C3N+, CHC3N+, HC3H+, HCNH+ and CH3+ have been measured for the first time and are compared with quantum chemical calculations. %G English %2 https://univ-rennes.hal.science/hal-01138635/document %2 https://univ-rennes.hal.science/hal-01138635/file/Photoionization%20spectroscopy%20of%20CH3C3N.pdf %L hal-01138635 %U https://univ-rennes.hal.science/hal-01138635 %~ UNIV-RENNES1 %~ CNRS %~ UNIV-PSUD %~ INSA-RENNES %~ ENSC-RENNES %~ ISCR %~ SCR-COS %~ JYB-LAB %~ STATS-UR1 %~ UR1-SPM %~ INC-CNRS %~ UR1-UFR-SPM %~ UR1-HAL %~ ISCR-CORINT %~ UR1-SDLM %~ UR1-SDLMJONCH %~ UNIV-PARIS-SACLAY %~ UNIV-PSUD-SACLAY %~ SYNCHROTRON-SOLEIL %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ INSA-GROUPE %~ UR1-MMS %~ ISCR-CORINT3 %~ GS-CHIMIE %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE %~ TEST2-HALCNRS %~ ICPO