Mass-selected molecular ion spectra: (1+1)-Photodissociation spectroscopy of CH3I+ and CD3I+ |
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| Institution: | 1. Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS, Grenoble 38000, France;2. Lunar and Planetary Laboratory, Univ. of Arizona, Tucson, AZ 85721, USA;3. Chemical Sciences and Engineering Division, Argonne National Lab., Argonne, IL 60439, USA;4. Department of Earth and Planetary Sciences, Johns Hopkins Univ., Baltimore, MD 21218, USA;5. Groupe de Spectrométrie Moléculaire et Atmosphérique, Univ. Reims Champagne-Ardenne, CNRS, Reims 51687, France;1. Istituto di Scienza e Tecnologia dell''Inquinamento Luminoso (Light Pollution Science and Technology Institute), Thiene 36016, Italy;2. Departamento de Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain;1. Department of Physics, Stockholm University, Stockholm 10691, Sweden;2. Institute for Ion Physics and Applied Physics, University of Innsbruck, Innsbruck A-6020 , Austria;3. Department of Physics, University of Trento, Trento I-38123, Italy |
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| Abstract: | The first well resolved (1+1)-photodissociation spectra of molecular ions are presented. By separating the spectroscopic step (first photon) and the dissociation step (second photon) we could extend the accessible spectral region of CH3I+ and CD3I+ considerably. The ions are prepared in the vibrationless ground state by MPI in a supersonic molecular beam. A new detection technique is presented with high discrimination between wanted and unwanted ionic species. Furthermore, another new technique for unimolecular decay measurements delivers useful information for the assignment of the ion spectra. We found an improved assignment for CH3I+ and CD3I+ with consequences for molecular constants. |
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