Infrared predissociation spectrum of the CH+ ion |
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| Affiliation: | 1. Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;2. Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany;1. I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany;2. Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands;3. Department of Physics and Astronomy, Purdue University, 47907 West Lafayette, IN, USA;1. Institute of Energetic Materials, Faculty of Chemical Technology, University of Pardubice, CZ-532 10 Pardubice, Czech Republic;2. Xi''an Modern Chemistry Research Institute, Xi''an, Shaanxi, 710065, China;3. School of Astronautics, Northwestern Polytechnical University, Xi''an 710072 Shaanxi, China;1. Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;2. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China;1. School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710119, China;2. Macedonian Academy of Sciences and Arts, P.O. Box 428, 1000 Skopje, Macedonia;3. Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China |
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| Abstract: | ![]()
A high-resolution infrared spectrum of the CH+ ion has been recorded in the range 875–1095 cm−1 using a laser/ion beam spectrometer. Eighty-seven transitions were detected by monitoring increased production of C+ fragment ions at resonance arising from predissociation of the upper states. Frequencies, linewidths, doublet splittings, relative intensities and upper state excess energies are reported for the transitions. A prediction of the spectrum, based on data from previous ab initio calculations and spectroscopic studies, was performed by using rotationally adiabatic potentials. Good qualitative agreement between the reported features of the observed spectrum and the prediction is found; the agreement suggests that the majority of the resonances are vibration-rotation transitions within the a 3Π state involving J = 20 to 40 and v = 7 to 12. The doublet splittings (16–672 MHz) are accounted for in terms of the proton nuclear hyperfine Fermi conctact interaction within this state. |
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