Double resonance spectroscopy of the (ProQuest: Formulae and/or non-USASCII text omitted) and (ProQuest: Formulae and/or non-USASCII text omitted) states near the third dissociation threshold of H sub(2)

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2013-12, Vol.46 (23), p.1-5
• Main Authors: Ekey, R C, Cordova, A E, Duan, W, Chartrand, A M, McCormack, E F
• Format: Article
• Language: English
• Subjects: Constants; Energy of dissociation; Energy use; Excitation spectra; Ionization; Mathematical analysis; Spectra; Texts
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/0953-4075/46/23/235101

Double-resonance laser spectroscopy via the E, F super(1) (ProQuest: Formulae and/or non-USASCII text omitted), v' = 6, J? state was used to probe the energy region below the third dissociation limit of molecular hydrogen. Resonantly enhanced multi-photon ionization spectra were recorded by detecting ion production as a function of energy using a time-of-flight mass spectrometer. Energies and line widths for the v = 14-17 levels of the (ProQuest: Formulae and/or non-USASCII text omitted) state of H sub(2) are reported and compared to experimental data obtained by using VUV synchrotron light excitation (Dickenson et al 2010 J. Chetn. Phys. 133 144317) and fully ab initio non-adiabatic calculations of (ProQuest: Formulae and/or non-USASCII text omitted) state energies and line widths (Glass-Maujean et al 2012 Phys. Rev. A 86 052507). Several high vibrational levels of the (ProQuest: Formulae and/or non-USASCII text omitted) state were also observed in this region. Term energies and rotational constants for the v = 67-69 vibrational levels are reported and compared to highly accurate ro-vibrational energy level predictions from fully ab initio non-adiabatic calculations of the first six (ProQuest: Formulae and/or non-USASCII text omitted) levels of H sub(2) (Wolniewicz et al 2006 J. Mol. Spectrosc. 238 118). While additional observed transitions can be assigned to other states, several unassigned features in the spectra highlight the need for a fully integrated theoretical treatment of dissociation and ionization to understand the complex pattern of highly vibrationally excited states expected in this region.