Spectrum of Field-Ionized Triplet Gerade Rydberg States of H2 and Comparison to Multichannel Quantum-Defect Theory
| Autor: | Thomas J. Morgan, A. de Magalhaes, W. Setzer |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010304 chemical physics
Chemistry Rotational–vibrational spectroscopy 010402 general chemistry Quantum number 01 natural sciences 0104 chemical sciences symbols.namesake Quantum defect Autoionization Excited state Metastability 0103 physical sciences Physics::Atomic and Molecular Clusters Rydberg formula symbols Physics::Atomic Physics Physical and Theoretical Chemistry Atomic physics Ground state |
| Zdroj: | The Journal of Physical Chemistry A. 123:3535-3542 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/acs.jpca.9b01445 |
| Popis: | A spectrum of field-ionized triplet Rydberg states of gerade symmetry H2 has been measured, excited from the υ″ = 0, N″ = 1-3 rovibrational levels of the metastable c3Πu-2pπ state in a 6 keV fast molecular beam. The field-ionized spectrum is kinetic energy labeled in order to separate it from the well-studied υ+ ≥ 1 autoionization spectrum. The spectrum consists of both ns and nd Rydberg series with n between 10 and 28 converging to the υ+ = 0, N+ = 1-3 levels of the X+ 2Σg+ ground state of H2+. Transitions with changes in vibration and/or rotation are also identified. The spectral positions of 59 transitions in the field ionization spectrum are identified and assigned quantum numbers using the predictions of multichannel quantum-defect theory (MQDT). The transition energies and subsequent effective quantum defects are compared between the experiment and theory. Most of the observed transitions, within the experimental uncertainty of 0.2 cm-1, agree with the energies predicted by MQDT. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|